Q35 / 160 · AP EAMCET 2021 (23 Aug Shift 2) · Chemistry

Carnallite in water dissociates to give..... ions.

  • Correct answer
    A
    $\mathrm{K}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Cl}^{-}$
  • B
    $\mathrm{K}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Br}^{-}$
  • C
    $\mathrm{K}^{+}, \mathrm{Zn}^{2+}$ and $\mathrm{Cl}^{-}$
  • D
    $\mathrm{K}^{+}, \mathrm{Ba}^{2+}$ and $\mathrm{Br}^{-}$

Solution

(a) Carnallite is a double salt. It will dissociate into simple substances or ions completely when dissolved in water to give 5 ions i.e. $\mathrm{K}^{+}, \mathrm{Mg}^{2+}$ and $3 \mathrm{Cl}^{-}$. $\mathrm{KCl} \cdot \mathrm{MgCl}_2 \cdot 6 \mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{K}^{+}+\mathrm{Mg}^{2+}+3 \mathrm{Cl}^{-}+6 \mathrm{H}_2 \mathrm{O}$

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

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