A white solid $$X$$ on heating gives a white solid $$Y$$ and an acidic gas $$Z.$$ Gas $$Z$$ is also given out when $$X$$ reacts with an acid. The compound $$Y$$ is also formed if caustic soda is left open in the atmosphere. $$X, Y$$ and $$Z$$ are
$$X$$
$$Y$$
$$Z$$
(a)
$$NaHC{O_3}$$
$$N{a_2}C{O_3}$$
$$C{O_2}$$
(b)
$$N{a_2}C{O_3}$$
$$NaOH$$
$$C{O_2}$$
(c)
$$N{a_2}C{O_3}$$
$$NaHC{O_3}$$
$$C{O_2}$$
(d)
$$NaOH$$
$$NaHC{O_3}$$
$$C{O_2}$$
A.
(a)
B.
(b)
C.
(c)
D.
(d)
Answer :
(a)
Solution :
$$\mathop {2NaHC{O_3}}\limits_{\left( X \right)} \to \mathop {N{a_2}C{O_3}}\limits_{\left( Y \right)} + \mathop {C{O_2}}\limits_{\left( Z \right)} + {H_2}O$$
$$\mathop {NaHC{O_3}}\limits_{\left( X \right)} + HCl \to $$ $$NaCl + \mathop {C{O_2}}\limits_{\left( Z \right)} + {H_2}O$$
$$\mathop {2NaOH + C{O_2} \to N{a_2}C{O_3} + }\limits_{\left( {{\text{atmosphere}}} \right)} $$ $$\mathop {{H_2}O}\limits_{\left( Y \right)} $$
Releted MCQ Question on Inorganic Chemistry >> S - Block Elements
Releted Question 1
A substance absorbs $$C{O_2}$$ and voilently reacts with water. The substance is