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Reaction of Metals with Bases

Which of the ...

Question

Which of the following metals on reacting with sodium hydroxide solution produce hydrogen gas?
a. $C u$
b. $A l$
c. $F e$
d. $Z n$

A

b and c

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B

b and d

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C

a and d

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D

b only

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Solution

The correct option is A b and d
Reactions:
$2 N a O H + Z n \to N a_{2} Z n O_{2} + H_{2}$
$2 N a O H + 2 A l + 2 H_{2} O \to 2 N a A l O_{2} + 3 H_{2}$
Hence, option $B$ is correct.

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