Acids, Bases and Salts MCQs 2026
19 questions with detailed answers · 6 from past papers · 2 quiz batches available
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- Q1 Past Paper · PPSC/FPSC/NTS medium
Phenolphthalein indicator turns pink in
💡 Explanation:Phenolphthalein remains colorless in acid and neutral solutions but turns pink in basic conditions.
- Q2 medium
Methyl orange indicator turns red in
💡 Explanation:Methyl orange turns red in strongly acidic solutions and yellow in basic ones.
- Q3 medium
The process of adding an acid to a base (or vice versa) until the reaction is complete is called
💡 Explanation:Titration is the controlled addition of one reactant to another to determine reaction completion.
- Q4 Past Paper · PPSC/FPSC/NTS medium
The point in a titration where equal moles of acid and base have reacted is called the
💡 Explanation:The equivalence point marks where stoichiometrically equal amounts of acid and base have reacted.
- Q5 medium
Table salt (sodium chloride) is chemically classified as
💡 Explanation:Sodium chloride, formed from a strong acid and strong base, is a neutral salt.
- Q6 medium
Baking soda (sodium bicarbonate) reacts with acids to release
💡 Explanation:Sodium bicarbonate reacts with acids to produce carbon dioxide, water, and a salt.
- Q7 Past Paper · PPSC/FPSC/NTS medium
Antacid tablets relieve acidity in the stomach because they contain
💡 Explanation:Antacids neutralize excess stomach acid using mild, safe bases.
- Q8 medium
The strength of an acid is measured quantitatively by its
💡 Explanation:Ka quantifies how completely an acid dissociates in water, indicating its strength.
- Q9 medium
A higher Ka value indicates a
💡 Explanation:A larger Ka value means greater dissociation, corresponding to a stronger acid.
- Q10 Past Paper · PPSC/FPSC/NTS hard
pOH is related to pH by the equation
💡 Explanation:At 25°C, pH and pOH always sum to 14 due to the water ionization constant.
- Q11 hard
If a solution has a pH of 3, its pOH is
💡 Explanation:Since pH + pOH = 14, a pH of 3 gives a pOH of 11.
- Q12 hard
Universal indicator is used to
💡 Explanation:Universal indicator changes through a range of colors corresponding to different pH values.
- Q13 Past Paper · PPSC/FPSC/NTS hard
Which of the following acids is found in vinegar
💡 Explanation:Vinegar's sour taste and properties come from dissolved acetic acid.
- Q14 hard
Which acid is found in citrus fruits like lemons
💡 Explanation:Citric acid is the primary organic acid responsible for the tartness of citrus fruits.
- Q15 hard
Which acid is present in the human stomach and aids digestion
💡 Explanation:The stomach secretes hydrochloric acid to aid digestion and kill pathogens.
- Q16 Past Paper · PPSC/FPSC/NTS hard
The salt formed when hydrochloric acid reacts with sodium hydroxide is
💡 Explanation:Neutralization of HCl with NaOH produces sodium chloride and water.
- Q17 hard
Which of the following best describes a normal salt
💡 Explanation:A normal salt results from complete neutralization, leaving no acidic hydrogen or basic hydroxide.
- Q18 hard
An acid salt contains a replaceable
💡 Explanation:Acid salts retain at least one ionizable hydrogen atom from the parent acid.
- Q19 hard
Which of the following is an example of an acid salt
💡 Explanation:Sodium bicarbonate retains one replaceable hydrogen atom, making it an acid salt.