Which of the following reaction is not correct?

K_{2} C r_{2} O_{7} (s) + 6 H_{2} S O_{4} (s) + 4 N a C l (s) Δ - \to 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

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K_{2} C r_{2} O_{7} (s) + 6 H_{2} S O_{4} (s) + 2 C a C l_{2} (s) Δ - \to 2 K H S O_{4} + 2 C a (H S O_{4})_{2} + 2 C r O_{2} C l_{2} + 3 H_{2} O

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K_{2} C r_{2} O_{7} (s) + 6 H_{2} S O_{4} (s) + 4 A g C l (s) Δ - \to 2 K H S O_{4} + 4 A g H S O_{4} + 2 C r O_{2} C l_{2} + 3 H_{2} O

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K_{2} C r_{2} O_{7} (s) + 6 H_{2} S O_{4} (s) + 4 K C l (s) Δ - \to 6 K H S O_{4} + 2 C r O_{2} C l_{2} + 3 H_{2} O

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Solution

The correct option is C $K_{2} C r_{2} O_{7} (s) + 6 H_{2} S O_{4} (s) + 4 A g C l (s) Δ - \to 2 K H S O_{4} + 4 A g H S O_{4} + 2 C r O_{2} C l_{2} + 3 H_{2} O$
These are reactions for the chromyl chloride test for $N a C l$ , $C a C l_{2}$ , $A g C l$ and $K C l$ respectively. But chromyl chloride test is not applicable to $A g C l$ since it is covalent in nature and does not generate $C l^{-}$ ions. Hence, option (c) is the incorrect option.

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