A certain compound $$X$$ imparts a golden yellow flame. When zinc powder is heated with concentrated solution of $$X,{H_2}$$ gas is evolved. $$X$$ combines with $$C{O_2}$$ to give a salt $$Y.$$ $$Y$$ is a hydrated salt which on reaction with $$HCl$$ or excess of $$C{O_2}$$ gives another salt $$Z$$ which is an important part of baking powder. Identify $$X, Y$$ and $$Z.$$
$$X$$
$$Y$$
$$Z$$
(a)
$$NaOH$$
$$N{a_2}C{O_3}$$
$$NaHC{O_3}$$
(b)
$$HCl$$
$$NaOH$$
$$NaHC{O_3}$$
(c)
$$KOH$$
$${K_2}C{O_3}$$
$$KHC{O_3}$$
(d)
$$NaCl$$
$$N{a_2}C{O_3}$$
$$NaOH$$
A.
(a)
B.
(b)
C.
(c)
D.
(d)
Answer :
(a)
Solution :
$$\eqalign{
& Zn + \mathop {2NaOH}\limits_{\left( X \right)} \to N{a_2}Zn{O_2} + {H_2} \cr
& \mathop {2NaOH}\limits_{\left( X \right)} + C{O_2} \to \mathop {N{a_2}C{O_3}}\limits_{\left( Y \right)} + {H_2}O \cr
& \mathop {N{a_2}C{O_3}}\limits_{\left( Y \right)} + HCl \to \mathop {NaHC{O_3}}\limits_{\left( Z \right)} + NaCl \cr
& \mathop {N{a_2}C{O_3}}\limits_{\left( Y \right)} + C{O_2} + {H_2}O \to \mathop {2NaHC{O_3}}\limits_{\left( Z \right)} \cr} $$
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