Write balanced chemical equations for the following reactions:
(i) A mixture of potassium dichromate and sodium chloride is heated with concentrated $H_{2} {S O}_{4}$ .
(ii) Aqueous solution of sodium nitrate is heated with zinc dust and caustic soda solution.
(iii) Sodium iodate is added to a solution of sodium bisulphite.
(iv) Iron reacts with cold dilute nitric acid.
(v) Potassium permanganate is added to a hot solution of manganous sulphate.

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Solution

Write balanced chemical equations for the following reactions:
(i) A mixture of potassium dichromate and sodium chloride is heated with concentrated $H_{2} {S O}_{4}$ .
$K_{2} C r_{2} O_{7} + 4 N a C l + 6 H_{2} S O_{4} ⟶ 2 K H S O_{4} + 4 N a H S O_{4} + 2 C r O_{2} C l_{2} + 3 H_{2} O$
(ii)Aqueous solution of sodium nitrate is heated with zinc dust and caustic soda solution.
$N a N O_{3} + 4 Z n + 7 N a O H ⟶ 4 N a_{2} Z n O_{2} + N H_{3} + 2 H_{2} O$
(iii)Sodium iodate is added to a solution of sodium bisulphite.
$2 N a l O_{3} + 5 N a H S O_{3} ⟶ 2 N a_{2} S O_{4} + 3 N a H S O_{4} + I_{2} + H_{2} O$
(iv) Iron reacts with cold dilute nitric acid.
$4 F e + 10 H N O_{3} ⟶ 4 F e (N O_{3})_{2} + N H_{4} N O_{3} + 3 H_{2} O$
(v) Potassium permanganate is added to a hot solution of manganous sulphate.
$2 K M n O_{4} + 3 M n S O_{4} + 2 H_{2} O ⟶ 5 M n O_{2} + K_{2} S O_{4} + 2 H_{2} S O_{4}$

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