Q60 / 180 · COMEDK 2023 (Memory Based) · Chemistry

Mohr's salt has the formula

  • A
    $\mathrm{FeSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O}$
  • Correct answer
    B
    $\mathrm{FeSO}_4\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}$
  • C
    $\mathrm{Fe}\left(\mathrm{SO}_4\right)_3\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}$
  • D
    $\mathrm{MgSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O}$

Solution

When $\mathrm{FeSO}_4 \cdot 7 \mathrm{H}_2 \mathrm{O}$ reacts with $\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4$, it forms a double salt known as ferrous ammonium sulphate $\left(\mathrm{FeSO}_4\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}\right)$ or Mohr's salt.

Hence, the correct answer is option: 'B'.

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