MCQ
$\underbrace {2NO + {O_2}}_{(X)} \rightleftharpoons \underbrace {2N{O_2}}_{(Y)}\underset{{heat}}{\overset{{cold}}{\longleftrightarrow}}\underbrace {{N_2}{O_4}}_{(Z)}$

$X, Y$ and $Z$ can be described as

  • $X \to $ Colourless, $Y \to $ Brown, paramagnetic, $Z \to $ Colourless, diamagnetic
  • B
    $X \to $ Brown, $Y \to $ Colourless, diamagnetic, $Z \to $ Brown, paramagnetic
  • C
    $X \to $ Colourless, $Y \to $ Colourless, paramagnetic, $Z \to $ Brown, diamagnetic
  • D
    $X \to $ Brown, $Y \to $ Brown, paramagnetic, $Z \to $ Brown, diamagnetic

Answer

Correct option: A.
$X \to $ Colourless, $Y \to $ Brown, paramagnetic, $Z \to $ Colourless, diamagnetic
a
$\underbrace{2NO+{{O}_{2}}}_{\begin{smallmatrix} 
 Colourless \\ 
 gases 
\end{smallmatrix}}\rightleftharpoons $  $\underbrace{2N{{O}_{2}}}_{\begin{align}
   \,\,\,\,\,\,\,\,\,\,\,\,\,Brown, \\ 
  paramagnetic\,\,gas \\ 
  due\,to\,presence\,\,of \\ 
  an\,\,odd\,\,electron \\ 
\end{align}}$  $\underset{heat}{\overset{cold}{\longleftrightarrow}}$  $\underbrace{{{N}_{2}}{{O}_{4}}}_{\begin{smallmatrix} 
 Colourless, \\ 
 diamagnetic 
 \\ 
 \,\,\,\,\,\,\,\,\,solid 
\end{smallmatrix}}$

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