Question

When a standard solution of $NaOH$ is left in air for few hours :

• A. precipitation occurs
• B. strength of solution decreases
• C. strength of solution increases
• D. the concentration of $N{a}^{+}$ ions in the solution remains the same

Answer 1

The correct option is B strength of solution decreases

$NaOH$ is deliquescent in nature. It absorbs water from the atmosphere and therefore, the strength of solution decreases.

Hence, option B is the correct answer.