When a standard solution of \( \mathrm{NaOH} \) is left in air for a few hours; (A) a precipitat...

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When a standard solution of \( \mathrm{NaOH} \) is left in air for a few hours;
(A) a precipitate will form
(B) strength will decrease
(C) strength will increase
(D) the concentration of \( \mathrm{Na}^{+} \)ions will not remain constant
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