Identify the incorrect reaction (s).

K_{2} C r_{2} O_{7} + 4 N a C l + 3 H_{2} S O_{4} (c o n c .) ⟶ 2 C r O_{2} C l_{2} + 2 N a S O_{4} + K_{2} S O_{4} + 3 H_{2} O

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K_{2} C r_{2} O_{7} + 6 K l + 7 H_{2} S O_{4} (c o n c .) ⟶ 3 l_{2} + C r_{2} (S O_{4}) + 4 K_{2} S O_{4} + 7 H_{2} O

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K_{2} C r_{2} O_{7} + 4 A g C l + 3 H_{2} S O_{4} (c o n c .) ⟶ 2 C r O_{2} C l_{2} + 2 A g_{2} S O_{4} + K_{2} S O_{4} + 3 H_{2} O

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M n O_{2} + N a C l + 2 H_{2} S O_{4} (c o n c .) ⟶ N a H S O_{4} + M n S O_{4} + H C l + H_{2} O + 1 / 2 O_{2}

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Solution

The correct options are
C $K_{2} C r_{2} O_{7} + 4 A g C l + 3 H_{2} S O_{4} (c o n c .) ⟶ 2 C r O_{2} C l_{2} + 2 A g_{2} S O_{4} + K_{2} S O_{4} + 3 H_{2} O$
D $M n O_{2} + N a C l + 2 H_{2} S O_{4} (c o n c .) ⟶ N a H S O_{4} + M n S O_{4} + H C l + H_{2} O + 1 / 2 O_{2}$
The reactions A and B are correct. The reactions C and D are incorrect.
(C) The reaction $K_{2} C r_{2} O_{7} + 4 A g C l + 3 H_{2} S O_{4} (c o n c .) ⟶ 2 C r O_{2} C l_{2} + 2 A g_{2} S O_{4} + K_{2} S O_{4} + 3 H_{2} O$ is incorrect.
The correct reaction is $K_{2} C r_{2} O_{7} + 4 N a C l + 6 H_{2} S O_{4} (c o n c .) ⟶ 2 C r O_{2} C l_{2} + 4 N a H S O_{4} + 2 K H S O_{4}$ .
(D) The reaction $M n O_{2} + N a C l + 2 H_{2} S O_{4} (c o n c .) ⟶ N a H S O_{4} + M n S O_{4} + H C l + H_{2} O + 1 / 2 O_{2}$ is incorrect.
The correct reaction is $2 M n O_{2} + 2 H_{2} S O_{4} \to 2 M n S O_{4} + 2 H_{2} O + O_{2} ↑$ .

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