Question:

Select from the following compounds which is not a base :

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Always check if a substance releases OH$^-$ ions in water — only then is it classified as a base.
  • Sodium hydroxide
  • Calcium hydroxide
  • Sodium sulphate
  • Zinc oxide
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The Correct Option is C

Solution and Explanation

Sodium hydroxide (NaOH) and calcium hydroxide [Ca(OH)$_2$] are strong bases commonly used in laboratories and industries. Zinc oxide (ZnO) is an amphoteric oxide, meaning it can behave both as a base and as an acid. Sodium sulphate (Na$_2$SO$_4$) is a neutral salt formed by the reaction of a strong acid (sulphuric acid) and a strong base (sodium hydroxide). It does not exhibit basic properties. Therefore, the correct answer is Sodium sulphate.
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