When a standard solution of \( \mathrm{NaOH} \) is left in air for ...

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When a standard solution of \( \mathrm{NaOH} \) is left in air for a few hours :
(a) a precipitate will form
\( \mathrm{P} \)
(b) strength of solution will decrease
W
(c) the strength of solution will increase
(d) the concentration of \( \mathrm{Na}^{+} \)ion in solution will remains same
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