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কোনটি জারণ-বিজারণ বিক্রিয়া নয় ?

2 C u {(N O_{3})}_{2} \to 2 C u O + 4 N O_{2} + O_{2}

2 N a + C 1_{2} \to 2 N a C 1

N a_{2} S O_{3} + 2 H C 1 \to 2 N a C 1 + S O_{2} + H_{2} O

M g + H_{2} S O_{4} + \to M g S O_{4} + H_{2}

ANS : 3

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