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Q.

Hydrogen is evolved the action of cold dilute HNO3 on

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a

Fe

b

Mg or Mn

c

Cu

d

Al

answer is B.

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Detailed Solution

Only Mg and Mn react with cold dil. HNO3  to give H2.Cu reaction with dilute HNO3 makes Copper (II) nitrate, nitric oxideFe reacts with dilute HNO3 makes Ferric nitrate, nitrous oxide and waterAl reacts with HNO3 makes Aluminium nitrate, nitrogen and water
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