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H_{2 (g)} + B r^{2} (g) \Leftrightarrow 2 H B r (g)

2 N O_{2} (g) + 7 H_{2} (g) \Leftrightarrow 2 N H_{3} (g) + 4 H_{2} O (g)

C O_{2} (g) + C (s) \Leftrightarrow 2 C O (g)

C a C O_{3} (s) \Leftrightarrow C a O (s) + C O_{2} (s)

ANS : 3

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