Question

Complete the given equations :
(i) $Cu + 8HNO_3 \to 3Cu(NO_3)_2 +$ W $+ 4H_2O$
(ii) $4Zn +10HNO_3 \to 4Zn(NO_3)_2 + 5H_2O+$ X
(iii) $I_2 + 10HNO_3 \to$ Y $+ 10NO_2 + 4H_2O$

	W	X	Y
(a)$\,\,$	$2NO_2\,\,$	$NO\,\,$	$5HIO_3\,\,$
(b)$\,\,$	$2NO\,\,$	$N_2O\,\,$	$2HIO_3\,\,$
(c)$\,\,$	$N_2\,\,$	$NO_2\,\,$	$HI\,\,$
(d)$\,\,$	$N_2O\,\,$	$NO_2\,\,$	$3HI\,\,$

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (B)

(i) $3Cu +8HNO_{3(dil).} \rightarrow 3Cu(NO_3)_2+ \underset{\text{(W)}}{2NO}+4H_2O$
(ii) $4Zn +\underset{\text{(very dilute)}}{10HNO_3} (5\%) \rightarrow 4Zn(NO_3)_2 +5H_2O \,+ \underset{\text{(X)}}{N_2O}$
(iii) $I_2 +10HNO_3 \rightarrow \underset{\text{(Y)}}{2HIO_3} +\,10NO_2 +4H_2O$