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Question

Which of the following on heating with NaOH solution gives inflammable gas?

A
S
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B
Zn
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C
NH4Cl
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D
I2
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Solution

The correct option is B Zn
Sodium hydroxide(NaOH) reacts with zinc(Zn) to form sodium zincate (Na2ZnO2) along with liberation of inflammable hydrogen gas.

Zn+2NaOHNa2ZnO2+H2

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