Reaction of ammonia with excess $Cl_2$ gives:

Which of the following statements is not true?

Which of the following is a liquid obtained from an equimolar mixture of two gases at $-30\,^oC$?

Which of the following orders is correct?

$\underbrace{2NO + O_2}_{(X)} \rightleftharpoons \underbrace{2NO_2}_{(Y)} \underset{heat}{\overset{cold}{\longleftrightarrow}} \underbrace{N_2O_4}_{(Z)}$
$X, Y$ and $Z$ can be described as:

Which of the following is an incorrect match?