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N H_{3} (g) + H C l (g) = N H_{4} C l (g)

C a O (s) + C O_{2} (g) = C a C O_{3} (s)

N H_{4} O H (a q) + H C l (a q) = N H_{4} C l (a q) + H_{2} y O (I)

F e O (s) + H C l (a q) = F e C l_{2} (a q) + H_{2} O (I)

ANS : 3

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