Hydrogen is liberated from nitric acid by the action of:
nickel
mercury
magnesium
copper
A
nickel
B
mercury
C
copper
D
magnesium
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Solution
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When metals react with nitric acid, hydrogen gas is liberated. Nitric acid is a very strong oxidizing agent.
So, it oxidizes the hydrogen gas formed during the reaction to form water and an oxide of nitrogen (NO,N2O,NO2)
The reaction takes place as
Mg+2HNO3→Mg(NO2)2+H2+O2
hence, hydrogen is librated from nitric acid by the action of magnesium.
Hence, te correct option is C
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