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Q.

Which reactions are useful to prepare Hydrogen in the laboratory?

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a

Decomposition 

b

Displacement 

c

Combination 

d

Disproportionation

answer is B.

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Detailed Solution

Metal + Acid → Salt +H2↑

Taking an example,  Zn+2HCl→ZnCl2+H2↑. Hydrogen can be prepared by this method and this is a displacement reaction. 

When an atom/ion of one compound is substituted by an atom/ion of another element, it is known as displacement reaction.

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