Question

Consider the following sequence of conversion.
$\underbrace{2NO +O_2}_{(X)} \rightleftharpoons \underset{\text{(Y)}}{2NO_2}\xrightleftharpoons[\text{heat}]{\text{Cool}} \underset{\text{(Z)}}{N_2O_4}$
$X$, $Y$ and $Z$ can be described as

	$X$	$Y$	$Z$
(a)$\,\,$	Colourless$\,\,$	Brown, paramagnetic$\,\,$	Colourless, diamagnetic$\,\,$
(b)$\,\,$	Brown$\,\,$	Colourless, diamagnetic$\,\,$	Brown, paramagnetic$\,\,$
(c)$\,\,$	Colourless$\,\,$	Colourless, paramagnetic$\,\,$	Brown, diamagnetic$\,\,$
(d)$\,\,$	Brown$\,\,$	Brown, paramagnetic$\,\,$	Brown, diamagnetic$\,\,$

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (A)

$\underbrace{2NO +O_2}_{\text{Colourless gases}} \rightleftharpoons \underset{\text{Brown, paramagnetic gas due to presence of an odd electron}}{2NO_2} \xrightleftharpoons[\text{Heat}]{\text{Cool}} \underset{\text{Colourless, diamagnetic solid}}{N_2O_4}$