How many of the following combinations will produce $H_{2}$ gas?
$(a) Cu metal and concentrated H N O_{3} (b) Au metal and NaCN in the presence of air (c) Zn metal and NaOH(aq) (d) Zn metal and dilute H N O_{3} (e) Solid carbon and steam at high temperature$

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Solution

$(a) C u + 4 H N O_{3} (c o n c .) \to C u (N O_{3})_{2} + + 2 N O_{2} + 2 H_{2} O (b) 4 A u (s) + 8 N a C N (a q) + 2 H_{2} O (a q) + O_{2} (g) \to 4 [A u (C N)_{2}]^{-} (a q) + 4 N a O H (a q) (c) Z n + N a O H (a q) \to N a_{2} Z n O_{2} Sodium zincate + H_{2} (g) (d) 4 Z n + 10 H N O_{3} (d i l u t e) \to 4 Z n (N O_{3})_{2} + 5 H_{2} O + N_{2} O (e) C (s) + H_{2} O (g) 1270 K - --- \to C O (g) + H_{2} (g)$

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