How many balanced reactions does $H_{2} O$ have in it?
$(A) C u + H N O_{3} (d i l) ⟶ N O + . . . . . . . + . . . . . . . . .$
$(B) P b (N O_{3})_{2} h e a t ⟶ P b O + . . . . . . + . . . . . .$
$(C) C u S O_{4} + N H_{4} O H (e x c e s s) ⟶ . . . . . . . . . . . . . . .$
$(D) A g C l + N H_{4} O H ⟶ . . . . . . . . . . . . . . . .$

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Solution

Water is present in three balanced reactions (A), (C) and (D).
(A) $C u + H N O_{3} (d i l) ⟶ N O + C u (N O_{3})_{2} + H_{2} O$
(B) $P b (N O_{3})_{2} h e a t ⟶ N O_{2} + O_{2}$
(C) $C u S O_{4} + N H_{4} O H (e x c e s s) ⟶ [C u (N H_{3})_{4}] S O_{4} + H_{2} O$
(D) $A g C l + N H_{4} O H ⟶ A g (N H_{3})_{2} C l + H_{2} O$

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