Question

An element 'X' is yellow coloured solid, insoluble in water but soluble in carbon disulphide. It has a low melting point ${114.5}^{o}C$. It boils at ${445}^{o}C$ and it burns with pale blue flame forming pungent smelling gas 'Y' which turns moist blue litmus red and finally colourless. 'X' and 'Y' are:

• A. $C$, $C{O}_2$
• B. $N$, $N{O}_2$
• C. $S$, $S{O}_2$
• D. $I_2$, $I_2{O}_5$

Answer 1

The correct option is C $S$, $S{O}_2$

Sulphur is yellow colored solid, Carbon is black, nitrogen is colorless gas, Iodine or $I_2$ lustrous metallic gray, violet as a gas.
Sulpur is yellow coloured solid, insoluble in water but soluble in carbon disulphide. It has low melting point 114.5^0C. It boils at ${445}^{o}C$ and it burns with pale blue flame forming pungent smelling gas $S{O}_2$ which turns moist blue litmus red and finally colorless.
Thus Option C is correct.