Question

38. Gas produced on reaction of Cu and cold
(1 : 1) HNO3 —
(A) N2
(B) N20
(C) NO2
(D) NO
00​

Answer 1

Answer:

NO2 is a reddish brown gas. Since copper (E°=+0.34v)is less reactive and comes below Hydrogen in electro chemical series, cannot displace hydrogen. Nitric acid being an oxidizing agent,oxidises Cu to Cut+2 and itself gets reduced from NO3- to NO2.

Answer 2

Gas produced on reaction of Cu and cold  $HNO_3$ gives  $N_20$.

Explanation:

• In the reaction between the copper and the nitric acid, copper being less reactive.

• As it comes under the hydrogen in the Electrochemical series so it can-not displace the Hydrogen.

• So, it acts as an oxidizing agent.

• The copper gets 'oxidized' to produce 'copper nitrate' with nitrogen dioxide as one product.

• Both 'nitric oxide and nitrogen dioxide' are  potentially toxic at high levels.

         $4 HNO3(l) + Cu(s) \rightarrow Cu(NO3)2 + 2 NO2(g) + 2 H2O(l)$.

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