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Standard IX
Chemistry
Preparation of Hydrogen from Cold Water and Metals
When zinc met...
Question
When zinc metal is heated with caustic soda solution, the gas evolved is :
(1) hydrogen
(2) carbon dioxide
(3) oxygen
(4) hydrogen choride
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Solution
When Zn metal is heated with caustic soda(NaOH) solution, then hydrogen gas evolves.
Zn
(
s
)
+
2
NaOH
(
aq
)
→
Na
2
ZnO
2
(
aq
)
+
H
2
(
g
)
Hence, the correct answer is option 1.
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