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Q.

Hydrogen is evolved the action of cold dilute ${HNO}_{3}$ 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. ${HNO}_{3} to give H_{2}$ .

Cu reaction with dilute HNO₃ makes Copper (II) nitrate, nitric oxide

Fe reacts with dilute HNO₃ makes Ferric nitrate, nitrous oxide and water

Al reacts with HNO₃ makes Aluminium nitrate, nitrogen and water

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Hydrogen is evolved the action of cold dilute HNO3 on