Chapter 22, Problem 4STP

To determine

To Choose: The correct option.

Explanation of Solution

Introduction:

A base is a substance, which on dissolving in water gives hydroxide ions.

Properties:

• In solution, the bases feel slippery.
• It turns red litmus paper blue.
• Some bases readily dissolve in water to give ${\text{OH}}^{-}$ ions.

As the properties of a base matches with the criteria of the unknown substance in question, therefore the unknown substance in the solution is likely to be a base.

Conclusion:

Option B-a baseis most likely to be the substance in the solution.