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নিম্নের কোন বিক্রিয়াটি সঠিক নয়?

3 S O_{2} (g) + K_{2} C r_{2} O_{7} (a q) + H_{2} S O_{4} (a q) \to K_{2} S O_{4} (a q) + C r_{2} (S O_{4})_{3} (a q) + H_{2} O (1)

C u (s) s + 2 H_{2} S O_{4} (1) \to C u S O_{4} (a q) + 2 H_{2} O (1) + S O_{2} (g)

P b (C H_{3} C O O)_{2} (a q) + H_{2} S (g) \to 2 C H C O O H (a q) + P b S (s) + H_{2} O (1)

A l_{2} O_{3} (s) + 2 N a O H (a q) \to 2 N a A l O_{2} (a q) + H_{2} O (1)

None

ANS : 2

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