Hydrogen gas is prepared in the laboratory by

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electrolysis of acidified water using platinum electrodes

action of zinc with dilute HCl

reaction of steam on hydrocarbons

controlled oxidation of hydrocarbons.

answer is B.

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Detailed Solution

Hydrogen gas is prepared in the laboratory by the action of zinc with dilute HCl.
$large Zn; + ;mathop {HCl}limits_{[dil]} ; to ;ZnC{l_2}; + ;{H_2} uparrow$

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