A gas $$(X)$$ is obtained when copper reacts with dilute $$HN{O_3}.$$ The gas thus formed reacts with oxygen to give brown fumes of $$\left( Y \right).$$ $$\left( Y \right)$$ when dissolved in water gives an important acid $$(Z)$$ and the gas $$(X).$$ $$X, Y$$ and $$Z$$ respectively are
A.
$$NO;N{O_2};HN{O_3}$$
B.
$$N{O_2};NO;HN{O_3}$$
C.
$${N_2}O;NO;HN{O_2}$$
D.
$$NO;{N_2}O;HN{O_3}$$
Answer :
$$NO;N{O_2};HN{O_3}$$
Solution :
$$3Cu + 8HN{O_{3\left( {dil} \right).}} \to 3Cu{\left( {N{O_3}} \right)_2}$$ $$ + \mathop {2NO}\limits_{\left( X \right)} + 4{H_2}O$$
$$\eqalign{
& 2NO + {O_2} \rightleftharpoons \mathop {2N{O_2}}\limits_{\left( Y \right)} \cr
& \mathop {3N{O_2}}\limits_{\left( Y \right)} + {H_2}O \to \mathop {2HN{O_3}}\limits_{\left( Z \right)} + \mathop {NO}\limits_{\left( X \right)} \cr} $$
Releted MCQ Question on Inorganic Chemistry >> P - Block Elements
Releted Question 1
The reddish brown coloured gas formed when nitric oxide is oxidised by air is