Q21 / 180 · KCET 2015 · Chemistry

How many ions per molecule are produced in the solution when Mohr salt is dissolved in
excess of water?

  • A
    \( 04 \)
  • Correct answer
    B
    \( 05 \)
  • C
    \( 06 \)
  • D
    \( 10 \)

Solution

The Mohr salt is a double salt of iron and ammoniumsulphates, therefore, on dissociation of the Mohr salt into water it dissociates to \( \mathrm{Fe}^{2+}, \mathrm{NH}_{4}^{+} \)and \( \mathrm{SO}_{4}{ }^{2-} \) ions. \(\mathrm{FeSO}_{4} \cdot\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O}_{-} \) Excess \( \mathrm{H}_{2} \mathrm{O}\) Therefore, total number of ions \( =(1)+(2)+(2)=5 \)

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

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