Question

What are the products formed when moist chlorine gas is reacted with hypo?
(a) ${\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}{\text{,S,HCl}}$
(b) ${\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{3}}}{\text{,S,HCl}}$
(c) ${\text{N}}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{4}}}{{\text{O}}_{\text{6}}}{\text{,N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{3}}}{\text{,HCl}}$
(d) ${\text{N}}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{4}}}{{\text{O}}_{\text{6}}}{\text{,NaCl,HCl}}$

Answer 1

Hint: To solve this problem, you need to know about the moist chlorine gas and hypo. It is obvious that moist chlorine gas is the chlorine gas in the presence of water. Also, you need to know that hypo is sodium thiosulphate.

Complete step by step solution:
We can solve this problem by writing all the reactants. First of all, our reactants are the moist chlorine which is chlorine gas in the presence of water. And another reactant is hypo which is also called sodium thiosulphate having the molecular formula${\text{N}}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{3}}}$. We can write the reaction:
$N{a_2}{S_2}{O_3} + C{l_2} + {H_2}O \to N{a_2}S{O_4} + S + HCl$
So, the products formed are${\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}{\text{,S,HCl}}$. Therefore, the correct option is (a).

Additional Information:
- The sodium thiosulphate is also called hyposulphate or hypo. The molar mass of thiosulfate is 158.11 g/mol. The thiosulphate is present also in the form of pentahydrate salt (${\text{N}}{{\text{a}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{3}}}{\text{.5}}{{\text{H}}_{\text{2}}}{\text{O}}$) with the molar mass of 248.18 g/mol.
- Sodium thiosulphate is an ionic compound with two cations of sodium and one negatively charged thiosulfate anion. The central sulphur atom is bonded to three oxygen atoms and one sulphur atom in its structure. The solid sodium thiosulphate exists in the monoclinic crystal structure.

Note: Sodium thiosulphate or hypo or thiosulphate is not a toxic substance. But it is widely used for medical purposes. Even though it produces toxic sulphur oxide fumes when it decomposes which causes irritation in eyes, skin, etc.