Question

No. of water molecules in mohr's salt is :

• A. $7$
• B. $6$
• C. $5$
• D. $8$

Answer 1

The correct option is B $6$

Ammonium iron(II) sulphate, or Mohr's salt, is the inorganic compound with the formula $\left(N{H}_4{)}_{2}Fe\right(S{O}_4{)}_2\cdot 6H_{2}O$. Containing two different cations, $F{e}^{2+}$ and $N{H}_4^{+}$. It is classified as a double salt of ferrous sulphate and ammonium sulphate.

So Mohr's salt contains 6 water molecules.

Hence option $B$ is correct.