Transition and InnerTransition Elements - Result Question 69
69. Write the balanced chemical equations for the following reactions.
(i) A mixture of potassium dichromate and sodium chloride is heated with concentrated $\mathrm{H}_2 \mathrm{SO}_4$.
(ii) Potassium permanganate is added to a hot solution of manganous sulphate.
$(1990,2 M)$
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Solution:
(i) $$ \begin{aligned} \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+4 \mathrm{NaCl}+6 \mathrm{H}_2 \mathrm{SO}_4 \longrightarrow & 2 \mathrm{CrO}_2 \mathrm{Cl}_2 \\
- & 4 \mathrm{NaHSO}_4+3 \mathrm{H}_2 \mathrm{O}+2 \mathrm{KHSO}_4 \end{aligned} $$
(ii) $$ \begin{aligned} 2 \mathrm{KMnO}_4+3 \mathrm{MnSO}_4+2 \mathrm{H}_2 \mathrm{O} \longrightarrow & 5 \mathrm{MnO}_2 \\
- & \mathrm{K}_2 \mathrm{SO}_4+2 \mathrm{H}_2 \mathrm{SO}_4 \end{aligned} $$
BETA
