Referring to the following reactions the missing products A, B, C, and D respectively are
NH 4 Cl (aq) + NaNO 2 (aq) 
[A] + H 2 O (1) + NaCl (aq)
(NH 4 ) 2 Cr 2 O 7 
[B] + H 2 O (l) + Cr 2 O 3 (s)
Cu + HNO 3 (dilute) 
Cu(NO 3 ) 2 + [C] + H 2 O(1)
Cu + HNO 3 (concentrate) 
Cu(NO 3 ) 2 + [D] + H 2 O(1)
Text Solution
Verified by ExpertsA
N 2 ,N 2 ,NO, NO 2
(i) In the laboratory, dinitrogen is prepared by treating an aqueous solution of ammonium chloride with sodium nitrite.
NH 4 C1 (aq) + NaNO 2 (aq) 
N 2 (g) + 2H 2 O (l) + NaCl (aq)
Small amounts of NO and HNO 3 are also formed as impurities, which can be removed by passing the gas through aqueous sulphuric acid containing potassium dichromate.
(ii) Dinitrogen can also be prepared by heating ammonium dichromate
(iii) Copper metal reacts with dilute HNO 3 to form nitrogen (II) oxide (NO)
3Cu (s) + 8HNO 3 (dilute) 
3Cu(NO 3 ) 2 (aq) + 2NO (g) + 4H 2 O (1)
(iv) Copper metal reacts with cone. HNO 3 to form nitrogen (IV) oxide or nitrogen dioxide (NO 2 ).
Cu (s) +4HNO 3 (cone.) 
Cu(NO 3 ) (aq) +2NO 2 (g) +2H 2 O (l)
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