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2 K C I O_{2} (s) \overset{∆}{\to} 2 K C I (s) + 30_{2} (g)

H_{2} (g) + I_{2} (g) \overset{450 ° C}{\to} 2 H I (g)

H_{2} (g) + C l_{2} (g) \to 2 H C I (g)

2 H I (g) \overset{450 ° C}{\to} H_{2} (g) + I_{2} (g)

ANS : 2

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