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C O (g) + \frac{1}{2} O_{2} (g) \to C O_{2} (g)

H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (g)

N O (g) + \frac{1}{2} O_{2} (g) \to N O_{2} (g)

K (s) + M n (s) + 20_{2} (g) \to K M n O_{4} (s)

ANS : 2

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