Q.

Which of the following when reacts with NaOH liberates a flammable gas ?

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a

Fe

b

SiO2

c

SO2

d

Zn

answer is D.

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Detailed Solution

Zn when reacts with NaOH liberates H2 gas which is a flammable gas.Zn + 2OH- →ZnO2-2 + H2
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