MCQ
Which among the given acids has lowest $pKa$ value
- AChloroacetic acid
- BBromoacetic acid
- ✓Nitroacetic acid
- DCyanoacetic acid
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$CaS{O_4}.5{H_2}{O_{(s)}}\, \rightleftharpoons \,CaS{O_4}.3{H_2}{O_{(s)}} + 2{H_2}{O_{(g)}}$ is equal to

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The number of hydroxyl groups present in the product $\mathrm{P}$ is______.
