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Q.

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

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a

A precipitate will form

b

Strength will decrease

c

Strength will increase

d

The concentration of ions will remain constant

answer is B.

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Detailed Solution

Sodium hydroxide reacts with weak acid (Carbondioxide) present in air to form sodium carbonate concentration of sodium hydroxide solution decrease.
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