Q28 / 90 · JEE Main 2021 (26 Aug Shift 1) · Chemistry

The ratio of number of water molecules in Mohr's salt and potash alum is $\times 10^{- 1} .$ (Integer answer)

Correct answer: 5

Solution

Mohr's salt

= {FeSO}_{4} {({NH}_{4})}_{2} {SO}_{4} \cdot 6 H_{2} O

Potash alum

= KAl {({SO}_{4})}_{2} \cdot 12 H_{2} O

So water molecule ratio

= (\frac{6}{12}) = \frac{1}{2} = 0.5 = 5 \times 10^{- 1}

Hence, the correct answer is 5.

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