Q.

 Which of the following would evolve hydrogen from dilute nitric acid?


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a

Magnesium

b

Iron

c

Copper

d

Zinc 

answer is A.

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Detailed Solution

Concept- Strong acid and powerful oxidizer, nitric acid is both. It produces metal salts, water and nitrogen oxides, when it reacts with metals. Magnesium and manganese, however, combine with extremely diluted nitric acid to produce salt and hydrogen.
The reaction of nitric acid with all the elements given in option :
Mg + HNO3 Mg(NO3) 2 +H2
Fe + HNO3   Fe(NO3) 2 + H2O +NO
Cu + HNO3 Cu(NO3) 2  + H2O + NO2
Zn + HNO3  Zn(NO3) 2 + H2O + NO2
In only magnesium (Mg) hydrogen evolves as a gas .
Hence, the correct option is (1).
 
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 Which of the following would evolve hydrogen from dilute nitric acid?