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Question

Statement I:- Hydrogen gas is not evolved when zinc reacts with cold water.

Statement II:- Sodium reacts vigorously with cold water to produce sodium hydroxide and hydrogen gas.

A
Only statement I is true.
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B
Only statement II is true.
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C
Both statements are true.
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D
Both statements are false.
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Solution

The correct option is C Both statements are true.

Zinc does not react with cold water to produce hydrogen gas. It produces hydrogen gas on reacting with steam. The reaction involved is:

Zn(s) + 2H2O(l) Zn(OH)2(aq) +H2(g)

Sodium reacts vigorously with cold water to produce sodium hydroxide and hydrogen gas. The reaction involved is:

2Na(s) + 2H2O(l) 2NaOH(aq) +H2(g)


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