Statement (A): The molecular formula of Hydrogen sulphide is ${\text{H}}_{\text{2}}\text{S}$.

Statement (B): The combining capacity of both chlorine and hydrogen is 1.

Statement (C): The molecular formula of Carbon tetra chloride is ${\text{CCl}}_4$

Explanation:

• Statement (A): The molecular formula of hydrogen sulfide is H₂S. This is accurate, as hydrogen sulfide consists of two hydrogen atoms bonded to one sulfur atom.
• Statement (B): The combining capacity (valency) of both hydrogen and chlorine is 1. This is correct; both elements typically form one bond in chemical compounds.
• Statement (C): The molecular formula of carbon tetrachloride is CCl₄. This is true; carbon tetrachloride comprises one carbon atom bonded to four chlorine atoms.

The correct answer is a) All the above statements are correct.