Multiple choice

Which one of the following substances is different from others on the basis of acidity?

  1. Barium hydroxide

  2. Calcium hydroxide

  3. Magnesium hydroxide

  4. Sodium hydroxide

  5. Zinc hydroxide
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D Correct answer
Explanation

The number of hydroxyl ions present in one molecule of base is called its acidity. In sodium hydroxide, only one hydroxyl ion is present, so its acidity is 1 while others have 2 hydroxyl ions, so the acidity is 2. The number of hydroxyl ions present in one molecule of base is called its acidity. In sodium hydroxide, only one hydroxyl ion is present, so its acidity is 1 while others have 2 hydroxyl ions, so the acidity is 2.Zinc hydroxide contain 2 hydroxyl ions, so its acidity is also 2.

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