Amongst the following the total number of elements, which produce $H_{2}$ gas with sodium hydroxide is:
Zn, Al, Sn, Pb, P, Si

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Solution

The correct option is C 5
$Z n + 2 N A O H \to N a_{2} Z n O_{2} + H_{2} ↑$
$2 A l + 2 N a O H + H_{2} O \to 2 N a A l O_{2} + 3 H_{2} ↑$
$S n + 2 N a O H + H_{2} O \to N a_{2} S n O_{3} + 2 H_{2} ↑$
$P b + 2 N a O H + H_{2} O \to N a_{2} P b O_{3} + 2 H_{2} ↑$
$S i + 2 N a O H + H_{2} O \to N a_{2} S i O_{3} + 2 H_{2} ↑$
$P_{4} + 3 N a O H + 3 H_{2} O \to P H_{2} ↑ + 3 N a H_{2} P O_{2}$

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