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Periodic Table & Elements MCQs 2026

101 questions with detailed answers · 0 from past papers · 11 quiz batches available

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🎯 Mock Test

Read each question, think about the answer, then click Show Answer to reveal the correct option and explanation. Load 10 at a time so it stays manageable — perfect for one-topic study sessions on the bus or during a break.

Page 1 of 1 Questions 1–10 of 101
  1. Q1 medium

    Elements in the periodic table are arranged primarily according to which property

    1. A Atomic mass only
    2. B Increasing atomic number
    3. C Alphabetical order
    4. D Discovery date
    💡 Explanation:

    The modern periodic table arranges elements in order of increasing atomic number.

  2. Q2 easy

    What is the chemical symbol for Potassium

    1. A Po
    2. B Pt
    3. C K
    4. D Ps
    💡 Explanation:

    Potassium's chemical symbol K comes from its Latin name "Kalium."

  3. Q3 easy

    Which chemical element, symbol Cl, is commonly used to disinfect drinking water and swimming pools

    1. A Chlorine
    2. B Carbon
    3. C Calcium
    4. D Cobalt
    💡 Explanation:

    Chlorine, symbol Cl, is widely used as a disinfectant for water treatment and swimming pools.

  4. Q4 easy

    Which gas is commonly used to fill balloons for buoyancy due to its low density and non-flammability

    1. A Hydrogen
    2. B Helium
    3. C Nitrogen
    4. D Oxygen
    💡 Explanation:

    Helium is commonly used to fill balloons due to its low density and non-flammable nature, unlike hydrogen.

  5. Q5 easy

    What is the chemical symbol for Gold

    1. A Au
    2. B Ag
    3. C Gd
    4. D Go
    💡 Explanation:

    Gold's chemical symbol Au comes from its Latin name "Aurum."

  6. Q6 easy

    What is the chemical symbol for Silver

    1. A Ag
    2. B Si
    3. C Sv
    4. D Sr
    💡 Explanation:

    Silver's chemical symbol Ag comes from its Latin name "Argentum."

  7. Q7 easy

    What is the chemical symbol for Iron

    1. A Ir
    2. B Fe
    3. C In
    4. D I
    💡 Explanation:

    Iron's chemical symbol Fe comes from its Latin name "Ferrum."

  8. Q8 easy

    What is the chemical symbol for Sodium

    1. A So
    2. B Na
    3. C Sd
    4. D S
    💡 Explanation:

    Sodium's chemical symbol Na comes from its Latin name "Natrium."

  9. Q9 medium

    What term describes elements arranged in vertical columns of the periodic table

    1. A Groups
    2. B Periods
    3. C Series
    4. D Rows
    💡 Explanation:

    Vertical columns in the periodic table are called groups (or families).

  10. Q10 medium

    What term describes elements arranged in horizontal rows of the periodic table

    1. A Groups
    2. B Periods
    3. C Series
    4. D Blocks
    💡 Explanation:

    Horizontal rows in the periodic table are called periods.

  11. Q11 medium

    Which group of elements is known as the "Alkaline Earth Metals," including calcium and magnesium

    1. A Group 1
    2. B Group 2
    3. C Group 17
    4. D Group 18
    💡 Explanation:

    Group 2 elements are known as the Alkaline Earth Metals, including calcium and magnesium.

  12. Q12 medium

    Which group of elements in the periodic table is known as the "Halogens," including chlorine and iodine

    1. A Group 1
    2. B Group 2
    3. C Group 17
    4. D Group 18
    💡 Explanation:

    Group 17 elements are known as the Halogens, including fluorine, chlorine, bromine, and iodine.

  13. Q13 medium

    Which group of elements in the periodic table is known as the "Alkali Metals," including sodium and potassium

    1. A Group 1
    2. B Group 2
    3. C Group 17
    4. D Group 18
    💡 Explanation:

    Group 1 elements, excluding hydrogen, are known as the Alkali Metals, including sodium and potassium.

  14. Q14 medium

    Which group of elements in the periodic table is known as the "Noble Gases," characterized by low reactivity

    1. A Group 1
    2. B Group 17
    3. C Group 18
    4. D Group 2
    💡 Explanation:

    Group 18 elements are known as the Noble Gases, characterized by their general lack of reactivity.

  15. Q15 easy

    What is the chemical symbol for Lead

    1. A Ld
    2. B Pb
    3. C Le
    4. D Pl
    💡 Explanation:

    Lead's chemical symbol Pb comes from its Latin name "Plumbum."

  16. Q16 medium

    What is the chemical symbol for Tin

    1. A Ti
    2. B Tn
    3. C Sn
    4. D Sb
    💡 Explanation:

    Tin's chemical symbol Sn comes from its Latin name "Stannum."

  17. Q17 easy

    What is the chemical symbol for Copper

    1. A Co
    2. B Cu
    3. C Cp
    4. D Cr
    💡 Explanation:

    Copper's chemical symbol Cu comes from its Latin name "Cuprum."

  18. Q18 medium

    What is the chemical symbol for Mercury

    1. A Hg
    2. B Me
    3. C Mr
    4. D Mc
    💡 Explanation:

    Mercury's chemical symbol Hg comes from its Latin/Greek name "Hydrargyrum," meaning liquid silver.

  19. Q19 medium

    What is the chemical symbol for Tungsten

    1. A Tu
    2. B Tg
    3. C W
    4. D Ts
    💡 Explanation:

    Tungsten's chemical symbol W comes from its German name "Wolfram."

  20. Q20 easy

    What is the atomic number of Hydrogen

    1. A 1
    2. B 2
    3. C 6
    4. D 8
    💡 Explanation:

    Hydrogen has an atomic number of 1, the simplest and lightest element.

  21. Q21 easy

    What is the atomic number of Oxygen

    1. A 6
    2. B 7
    3. C 8
    4. D 9
    💡 Explanation:

    Oxygen has an atomic number of 8.

  22. Q22 easy

    What is the atomic number of Carbon

    1. A 4
    2. B 6
    3. C 8
    4. D 12
    💡 Explanation:

    Carbon has an atomic number of 6.

  23. Q23 easy

    What is the atomic number of Nitrogen

    1. A 6
    2. B 7
    3. C 8
    4. D 9
    💡 Explanation:

    Nitrogen has an atomic number of 7.

  24. Q24 easy

    What is the atomic number of Helium

    1. A 1
    2. B 2
    3. C 4
    4. D 10
    💡 Explanation:

    Helium has an atomic number of 2.

  25. Q25 medium

    Which element has the atomic number 79 and is famously used in jewelry and as a store of value

    1. A Silver
    2. B Gold
    3. C Platinum
    4. D Copper
    💡 Explanation:

    Gold has the atomic number 79.

  26. Q26 easy

    Which element has the highest natural abundance in the Earth's atmosphere

    1. A Oxygen
    2. B Nitrogen
    3. C Carbon dioxide
    4. D Argon
    💡 Explanation:

    Nitrogen makes up approximately 78% of Earth's atmosphere, the most abundant atmospheric gas.

  27. Q27 easy

    Approximately what percentage of Earth's atmosphere is composed of oxygen

    1. A 21%
    2. B 50%
    3. C 78%
    4. D 95%
    💡 Explanation:

    Oxygen constitutes approximately 21% of Earth's atmosphere.

  28. Q28 medium

    Which element is the most abundant in the Earth's crust by mass

    1. A Iron
    2. B Silicon
    3. C Oxygen
    4. D Aluminum
    💡 Explanation:

    Oxygen is the most abundant element in the Earth's crust by mass, primarily in the form of oxide compounds.

  29. Q29 easy

    Which is the lightest chemical element in the periodic table

    1. A Helium
    2. B Hydrogen
    3. C Lithium
    4. D Carbon
    💡 Explanation:

    Hydrogen is the lightest element in the periodic table.

  30. Q30 medium

    Which element is the most abundant in the entire observable universe

    1. A Hydrogen
    2. B Helium
    3. C Oxygen
    4. D Carbon
    💡 Explanation:

    Hydrogen is the most abundant element in the universe, making up roughly 75% of its elemental mass.

  31. Q31 easy

    Who is credited with developing the first widely recognized periodic table, arranging elements by atomic weight

    1. A Dmitri Mendeleev
    2. B John Dalton
    3. C Antoine Lavoisier
    4. D Marie Curie
    💡 Explanation:

    Dmitri Mendeleev developed the first widely recognized periodic table in 1869, arranging elements by atomic weight.

  32. Q32 hard

    What is the general name for the specific region within the periodic table containing elements with partially filled d-orbitals, including many industrially important metals

    1. A s-block
    2. B p-block
    3. C d-block (Transition metals)
    4. D f-block
    💡 Explanation:

    The d-block, containing the transition metals, includes many industrially significant metals like iron, copper, and gold.

  33. Q33 easy

    What is the chemical symbol for Calcium

    1. A Ca
    2. B Cl
    3. C Co
    4. D Cs
    💡 Explanation:

    Calcium's chemical symbol is Ca.

  34. Q34 easy

    What is the chemical symbol for Neon

    1. A Ne
    2. B No
    3. C Nn
    4. D Nm
    💡 Explanation:

    Neon's chemical symbol is Ne, commonly known for its use in neon signs.

  35. Q35 medium

    What is the chemical symbol for Argon

    1. A Ag
    2. B Ar
    3. C At
    4. D Am
    💡 Explanation:

    Argon's chemical symbol is Ar.

  36. Q36 medium

    What is the chemical symbol for Titanium

    1. A Ti
    2. B Ta
    3. C Tn
    4. D Tm
    💡 Explanation:

    Titanium's chemical symbol is Ti, known for its strength and lightweight properties.

  37. Q37 medium

    What is the chemical symbol for Cobalt

    1. A Co
    2. B Cb
    3. C Cl
    4. D Ct
    💡 Explanation:

    Cobalt's chemical symbol is Co.

  38. Q38 medium

    What is the chemical symbol for Manganese

    1. A Mn
    2. B Mg
    3. C Ma
    4. D Mo
    💡 Explanation:

    Manganese's chemical symbol is Mn.

  39. Q39 hard

    What is the chemical symbol for Barium

    1. A Ba
    2. B Br
    3. C Bi
    4. D Bo
    💡 Explanation:

    Barium's chemical symbol is Ba.

  40. Q40 medium

    What is the chemical symbol for Iodine

    1. A Io
    2. B I
    3. C Id
    4. D In
    💡 Explanation:

    Iodine's chemical symbol is simply I.

  41. Q41 medium

    What is the chemical symbol for Bromine

    1. A Br
    2. B Bo
    3. C Bm
    4. D Bi
    💡 Explanation:

    Bromine's chemical symbol is Br.

  42. Q42 hard

    What is the name for the two rows typically placed below the main body of the periodic table, including elements like uranium and plutonium

    1. A Alkali metals and alkaline earth metals
    2. B Lanthanides and Actinides
    3. C Halogens and noble gases
    4. D Transition metals
    💡 Explanation:

    The Lanthanides and Actinides are typically placed below the main table body, including elements like uranium and plutonium.

  43. Q43 medium

    What is the chemical symbol for Fluorine

    1. A Fl
    2. B F
    3. C Fr
    4. D Fu
    💡 Explanation:

    Fluorine's chemical symbol is simply F.

  44. Q44 medium

    Which element has atomic number 92, notable for its use in nuclear power and weapons

    1. A Plutonium
    2. B Uranium
    3. C Thorium
    4. D Radium
    💡 Explanation:

    Uranium has atomic number 92 and is significant in nuclear energy and weapons applications.

  45. Q45 medium

    Which radioactive element, discovered by Marie and Pierre Curie, has the atomic number 88

    1. A Uranium
    2. B Polonium
    3. C Radium
    4. D Plutonium
    💡 Explanation:

    Radium, discovered by the Curies, has atomic number 88.

  46. Q46 hard

    Which element, discovered by Marie Curie and named after her native country, has atomic number 84

    1. A Polonium
    2. B Radium
    3. C Uranium
    4. D Francium
    💡 Explanation:

    Polonium, discovered by Marie Curie, was named after her native Poland and has atomic number 84.

  47. Q47 medium

    What is the term for atoms of the same element having different numbers of neutrons

    1. A Isotopes
    2. B Isomers
    3. C Ions
    4. D Allotropes
    💡 Explanation:

    Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.

  48. Q48 medium

    What is the term for different structural forms of the same element in the same physical state, such as diamond and graphite for carbon

    1. A Isotopes
    2. B Isomers
    3. C Allotropes
    4. D Isobars
    💡 Explanation:

    Allotropes refer to different structural forms of the same element, such as diamond and graphite, both forms of carbon.

  49. Q49 medium

    Diamond and graphite are both allotropes of which element

    1. A Silicon
    2. B Carbon
    3. C Sulfur
    4. D Phosphorus
    💡 Explanation:

    Diamond and graphite are both allotropic forms of carbon, differing in their atomic structural arrangement.

  50. Q50 medium

    What is the term for a positively or negatively charged atom or molecule, resulting from loss or gain of electrons

    1. A Isotope
    2. B Ion
    3. C Isomer
    4. D Molecule
    💡 Explanation:

    An ion is an atom or molecule that has gained or lost electrons, resulting in a net electrical charge.

  51. Q51 medium

    What is the term for a negatively charged ion, having gained one or more electrons

    1. A Cation
    2. B Anion
    3. C Isotope
    4. D Molecule
    💡 Explanation:

    An anion is a negatively charged ion, formed when an atom gains one or more electrons.

  52. Q52 medium

    What is the term for a positively charged ion, having lost one or more electrons

    1. A Cation
    2. B Anion
    3. C Isotope
    4. D Compound
    💡 Explanation:

    A cation is a positively charged ion, formed when an atom loses one or more electrons.

  53. Q53 easy

    Which subatomic particle carries a positive electrical charge, found in the nucleus of an atom

    1. A Electron
    2. B Proton
    3. C Neutron
    4. D Photon
    💡 Explanation:

    Protons carry a positive charge and are found within the atomic nucleus.

  54. Q54 easy

    Which subatomic particle carries no electrical charge, found in the nucleus alongside protons

    1. A Electron
    2. B Proton
    3. C Neutron
    4. D Photon
    💡 Explanation:

    Neutrons carry no electrical charge and reside in the nucleus alongside protons.

  55. Q55 easy

    Which subatomic particle carries a negative electrical charge and orbits the nucleus

    1. A Electron
    2. B Proton
    3. C Neutron
    4. D Positron
    💡 Explanation:

    Electrons carry a negative charge and orbit the nucleus in electron shells.

  56. Q56 medium

    What determines an element's atomic number

    1. A Number of neutrons
    2. B Number of protons
    3. C Number of electrons only when neutral
    4. D Total mass of the atom
    💡 Explanation:

    An element's atomic number is determined by the number of protons in its nucleus.

  57. Q57 easy

    What is the chemical symbol for Magnesium

    1. A Mg
    2. B Ma
    3. C Mn
    4. D Mo
    💡 Explanation:

    Magnesium's chemical symbol is Mg.

  58. Q58 easy

    What is the chemical symbol for Aluminum

    1. A Al
    2. B Am
    3. C Au
    4. D An
    💡 Explanation:

    Aluminum's chemical symbol is Al.

  59. Q59 easy

    What is the chemical symbol for Zinc

    1. A Zc
    2. B Zi
    3. C Zn
    4. D Zk
    💡 Explanation:

    Zinc's chemical symbol is Zn.

  60. Q60 medium

    What is the chemical symbol for Nickel

    1. A Ni
    2. B Nk
    3. C Nc
    4. D Nl
    💡 Explanation:

    Nickel's chemical symbol is Ni.

  61. Q61 easy

    What is the chemical symbol for Chlorine

    1. A Cl
    2. B Ch
    3. C Co
    4. D Cn
    💡 Explanation:

    Chlorine's chemical symbol is Cl.

  62. Q62 easy

    What is the chemical symbol for Sulfur

    1. A Su
    2. B S
    3. C Sl
    4. D Sf
    💡 Explanation:

    Sulfur's chemical symbol is simply S.

  63. Q63 medium

    What is the chemical symbol for Platinum

    1. A Pt
    2. B Pl
    3. C Pn
    4. D Pm
    💡 Explanation:

    Platinum's chemical symbol is Pt.

  64. Q64 medium

    What is the chemical symbol for Uranium

    1. A Ur
    2. B U
    3. C Un
    4. D Um
    💡 Explanation:

    Uranium's chemical symbol is simply U.

  65. Q65 easy

    What is the chemical symbol for Phosphorus

    1. A Ph
    2. B P
    3. C Po
    4. D Pr
    💡 Explanation:

    Phosphorus's chemical symbol is simply P.

  66. Q66 medium

    Which element, added in trace amounts to municipal water in some areas, is credited with helping prevent tooth decay

    1. A Chlorine
    2. B Fluorine (as fluoride)
    3. C Iodine
    4. D Bromine
    💡 Explanation:

    Fluoride, a compound of fluorine, is added to some water supplies to help prevent tooth decay.

  67. Q67 hard

    Which alkali metal, symbol Cs, is used in atomic clocks due to its precise vibrational frequency

    1. A Rubidium
    2. B Cesium
    3. C Francium
    4. D Potassium
    💡 Explanation:

    Cesium is used in atomic clocks because its vibrational frequency provides an extremely precise time standard.

  68. Q68 hard

    Which reactive nonmetal, symbol F, is the most electronegative element on the periodic table

    1. A Chlorine
    2. B Fluorine
    3. C Oxygen
    4. D Nitrogen
    💡 Explanation:

    Fluorine is the most electronegative element in the periodic table, meaning it has the strongest tendency to attract electrons.

  69. Q69 easy

    Which element, symbol K, is essential for nerve function and is found abundantly in bananas

    1. A Krypton
    2. B Potassium
    3. C Cobalt
    4. D Calcium
    💡 Explanation:

    Potassium, symbol K, is essential for proper nerve and muscle function and is abundant in foods like bananas.

  70. Q70 easy

    Which soft, silvery-white alkaline earth metal, essential for bone health, has the chemical symbol Ca

    1. A Cadmium
    2. B Calcium
    3. C Cobalt
    4. D Cesium
    💡 Explanation:

    Calcium, symbol Ca, is essential for bone health and various physiological functions.

  71. Q71 medium

    Which element is the third most abundant in the Earth's crust, widely used in construction and packaging (as its metal or compounds)

    1. A Aluminum
    2. B Iron
    3. C Silicon
    4. D Calcium
    💡 Explanation:

    Aluminum is the third most abundant element in Earth's crust and is widely used in construction and packaging.

  72. Q72 medium

    Which element, the second most abundant in the Earth's crust after oxygen, is a key component of sand, glass, and computer chips

    1. A Aluminum
    2. B Silicon
    3. C Iron
    4. D Calcium
    💡 Explanation:

    Silicon is the second most abundant element in Earth's crust, essential to sand, glass, and semiconductor manufacturing.

  73. Q73 medium

    Which chemical element, symbol Ne, is a noble gas that does not naturally form compounds under normal conditions

    1. A Neon
    2. B Nitrogen
    3. C Nickel
    4. D Niobium
    💡 Explanation:

    Neon, a noble gas, is chemically inert and does not naturally form compounds under standard conditions.

  74. Q74 hard

    Which trace element, essential in small amounts for human health but toxic in excess, has the symbol Se

    1. A Sulfur
    2. B Selenium
    3. C Silicon
    4. D Silver
    💡 Explanation:

    Selenium, symbol Se, is an essential trace element with antioxidant properties, though toxic in excessive amounts.

  75. Q75 medium

    Which semi-metallic element, symbol As, is highly toxic and has historically been used as a poison

    1. A Antimony
    2. B Arsenic
    3. C Astatine
    4. D Aluminum
    💡 Explanation:

    Arsenic, symbol As, is a toxic semi-metallic element historically infamous for its use as a poison.

  76. Q76 medium

    Which highly toxic heavy metal, symbol Pb, was historically used in paint and gasoline before health concerns led to bans

    1. A Mercury
    2. B Lead
    3. C Cadmium
    4. D Arsenic
    💡 Explanation:

    Lead, symbol Pb, was historically used in paint and gasoline until health concerns led to widespread regulatory bans.

  77. Q77 medium

    Which lightweight, silvery metal, atomic number 3, is used in modern rechargeable batteries

    1. A Sodium
    2. B Lithium
    3. C Beryllium
    4. D Boron
    💡 Explanation:

    Lithium, atomic number 3, is widely used in modern rechargeable batteries due to its light weight and electrochemical properties.

  78. Q78 medium

    Which metal, resistant to rust and commonly used in stainless steel, has the chemical symbol Cr

    1. A Chromium
    2. B Cobalt
    3. C Copper
    4. D Cadmium
    💡 Explanation:

    Chromium, symbol Cr, is added to steel to create stainless steel, providing rust resistance.

  79. Q79 easy

    Which noble gas, atomic number 10, is commonly used in illuminated signage due to its distinctive glow

    1. A Argon
    2. B Neon
    3. C Krypton
    4. D Helium
    💡 Explanation:

    Neon gas produces a distinctive reddish-orange glow when electrified, commonly used in neon signs.

  80. Q80 medium

    Which precious metal, resistant to corrosion, is commonly used in jewelry and has the chemical symbol Pt

    1. A Palladium
    2. B Platinum
    3. C Plutonium
    4. D Polonium
    💡 Explanation:

    Platinum, symbol Pt, is a corrosion-resistant precious metal commonly used in fine jewelry and industrial catalysts.

  81. Q81 medium

    Which element, atomic number 26, is a key component of steel and essential for hemoglobin

    1. A Iron
    2. B Nickel
    3. C Zinc
    4. D Chromium
    💡 Explanation:

    Iron (atomic number 26) is essential both as a component of steel and as a key part of hemoglobin.

  82. Q82 medium

    Which two elements combine to form the alloy steel, primarily

    1. A Iron and Carbon
    2. B Copper and Tin
    3. C Copper and Zinc
    4. D Aluminum and Magnesium
    💡 Explanation:

    Steel is primarily an alloy of iron and carbon, with the carbon content affecting its properties.

  83. Q83 medium

    Which two elements combine to form the alloy bronze

    1. A Copper and Tin
    2. B Copper and Zinc
    3. C Iron and Carbon
    4. D Aluminum and Copper
    💡 Explanation:

    Bronze is an alloy primarily composed of copper and tin.

  84. Q84 medium

    Which two elements combine to form the alloy brass

    1. A Copper and Zinc
    2. B Copper and Tin
    3. C Iron and Nickel
    4. D Aluminum and Tin
    💡 Explanation:

    Brass is an alloy composed primarily of copper and zinc.

  85. Q85 hard

    Which gas, essential for combustion, was historically called "dephlogisticated air" before its proper identification

    1. A Nitrogen
    2. B Oxygen
    3. C Carbon dioxide
    4. D Hydrogen
    💡 Explanation:

    Oxygen was historically referred to as "dephlogisticated air" by early chemists before Lavoisier properly characterized it.

  86. Q86 hard

    Which scientist is credited with identifying and naming oxygen, establishing key principles of modern chemistry

    1. A Antoine Lavoisier
    2. B John Dalton
    3. C Robert Boyle
    4. D Joseph Priestley (co-discoverer, though Lavoisier named/explained it)
    💡 Explanation:

    Antoine Lavoisier is credited with correctly identifying and naming oxygen, foundational to modern chemistry, though Priestley also independently discovered it.

  87. Q87 medium

    Which scientist developed the early atomic theory, proposing that matter is composed of indivisible atoms

    1. A John Dalton
    2. B Antoine Lavoisier
    3. C Robert Boyle
    4. D Dmitri Mendeleev
    💡 Explanation:

    John Dalton developed early atomic theory, proposing that all matter is composed of indivisible atoms.

  88. Q88 medium

    Which chemical element, atomic number 6, exists in multiple forms including diamond, graphite, and more recently discovered fullerenes

    1. A Silicon
    2. B Carbon
    3. C Boron
    4. D Nitrogen
    💡 Explanation:

    Carbon exists in various allotropic forms, including diamond, graphite, and fullerenes like buckminsterfullerene.

  89. Q89 medium

    Which chemically inert element, atomic number 2, is used to cool superconducting magnets, including in MRI machines

    1. A Hydrogen
    2. B Helium
    3. C Neon
    4. D Argon
    💡 Explanation:

    Helium, due to its extremely low boiling point, is used to cool superconducting magnets in devices like MRI machines.

  90. Q90 medium

    Which element, atomic number 17, is used in small amounts to disinfect drinking water supplies

    1. A Fluorine
    2. B Chlorine
    3. C Bromine
    4. D Iodine
    💡 Explanation:

    Chlorine (atomic number 17) is widely used to disinfect municipal water supplies.

  91. Q91 medium

    Which gas, symbol N, is used to create an inert atmosphere in food packaging to preserve freshness

    1. A Oxygen
    2. B Nitrogen
    3. C Carbon dioxide
    4. D Argon
    💡 Explanation:

    Nitrogen gas is commonly used in food packaging to displace oxygen and preserve freshness.

  92. Q92 medium

    Which element, symbol Si, is the primary component of computer chips and glass

    1. A Sulfur
    2. B Silicon
    3. C Sodium
    4. D Silver
    💡 Explanation:

    Silicon, an abundant metalloid, is the primary material used in computer chips and glass manufacturing.

  93. Q93 hard

    Which noble gas, symbol Xe, is used in some specialized lighting and ion propulsion for spacecraft

    1. A Neon
    2. B Krypton
    3. C Xenon
    4. D Radon
    💡 Explanation:

    Xenon is used in specialized lighting and has applications in ion propulsion systems for spacecraft.

  94. Q94 medium

    Which radioactive noble gas, symbol Rn, can accumulate in basements and poses a health hazard

    1. A Xenon
    2. B Krypton
    3. C Argon
    4. D Radon
    💡 Explanation:

    Radon is a radioactive noble gas that can accumulate in enclosed spaces like basements, posing lung cancer risks.

  95. Q95 easy

    Which metal, extremely lightweight and used in aircraft manufacturing, has the chemical symbol Al

    1. A Antimony
    2. B Aluminum
    3. C Arsenic
    4. D Argon
    💡 Explanation:

    Aluminum, symbol Al, is a lightweight, strong metal widely used in aircraft and other manufacturing applications.

  96. Q96 easy

    Which metal, known for being liquid at room temperature, has the chemical symbol Hg

    1. A Mercury
    2. B Manganese
    3. C Molybdenum
    4. D Magnesium
    💡 Explanation:

    Mercury, symbol Hg, is unusual among metals for being liquid at standard room temperature.

  97. Q97 easy

    Which element, essential for life and forming the backbone of organic molecules, has the chemical symbol C

    1. A Calcium
    2. B Carbon
    3. C Cobalt
    4. D Chlorine
    💡 Explanation:

    Carbon, symbol C, forms the structural backbone of all organic molecules essential to life.

  98. Q98 medium

    Which highly reactive metal, stored in oil to prevent reaction with air/water, has the chemical symbol Na

    1. A Nickel
    2. B Sodium
    3. C Nitrogen
    4. D Neon
    💡 Explanation:

    Sodium, a highly reactive alkali metal, is typically stored in oil to prevent reaction with air or moisture.

  99. Q99 hard

    Which spherical carbon allotrope, resembling a soccer ball structure, was discovered in 1985 and later earned a Nobel Prize

    1. A Graphene
    2. B Buckminsterfullerene (Buckyball)
    3. C Graphite
    4. D Diamond
    💡 Explanation:

    Buckminsterfullerene, a spherical carbon molecule resembling a soccer ball, was discovered in 1985, earning a Nobel Prize.

  100. Q100 medium

    Which element is used as the primary fuel source in most nuclear power plants

    1. A Plutonium primarily
    2. B Uranium primarily
    3. C Thorium primarily
    4. D Radium primarily
    💡 Explanation:

    Uranium, particularly the isotope U-235, is the primary fuel used in most conventional nuclear power plants.

  101. Q101 hard

    Which single-layer carbon allotrope, known for extraordinary strength and conductivity, was isolated in 2004, also earning a Nobel Prize

    1. A Buckminsterfullerene
    2. B Graphene
    3. C Diamond
    4. D Graphite
    💡 Explanation:

    Graphene, a single layer of carbon atoms, was isolated in 2004 and earned researchers a Nobel Prize for its remarkable properties.

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