Home Chemistry Ionic Equilibrium All Topic Question for Revision Test Sodium hydroxide cannot be used as a primary…
Chemistry Ionic Equilibrium All Topic Question for Revision Test Single Correct MCQ
Published on: August 12, 2026

Sodium hydroxide cannot be used as a primary standard for acid base titration because:

A
it is corrosive and reacts with glass.
B
the dissolution of sodium hydroxide in water is highly exothermic, hence its concentration changes on dissolution.
C
it is hygroscopic and also reacts with atmospheric carbon dioxide.
D
hydroxides cannot be used as primary standards.

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The correct answer is:
C

NaOH cannot be used as a primary standard because it absorbs moisture (hygroscopic) and from air, changing its composition.

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