Question

Identify the correct statements.
A. ${H_2}S{O_4}$ can be used for drying ${H_2}S$ gas.
B. ${H_2}S$ is a better reducing agent than water.
C. Reaction of ${H_2}S{O_4}$ with $BaC{l_2}$ shows its oxidising nature.
D. ${H_2}S$ can form coloured precipitates with metal ions.

Answer 1

Sulfuric acid is a powerful acid that is both hygroscopic and oxidising. Sulfuric acid has the chemical formula ${H_2}S{O_4}$ and is a mineral acid. It is caustic and has a strong acidic tendency. It works as an oxidising and dehydrating agent at greater concentrations.

Complete Step By Step Answer:
Concentrated sulphuric acid has strong oxidising power, while hydrogen sulphide is a powerful reducing agent. When the former comes into contact with the acid, it can be oxidised to its elemental form, which is sulphur. Hence, ${H_2}S{O_4}$ cannot be used for drying ${H_2}S$ gas.
In ${H_2}O$ Bond dissociation enthalpy of $O - H$ is more than $S - H$ bond of ${H_2}S$ therefore ${H_2}S$ is known as a better reducing agent than ${H_2}O$ . Therefore , ${H_2}S$ is a better reducing agent than water.
$ZnC{l_2} + {H_2}S \to 2HCl + ZnS$
In $ZnC{l_2}$ , $Zn$ loses two electrons and form $Z{n^{2 + }}$ and reacts with sulphur of ${H_2}S$ and forms $ZnS$ which is a precipitate. Hence, $Z{n^{2 + }}$ is colourless.
Hence, the correct option is B. ${H_2}S$ is a better reducing agent than water.
D. ${H_2}S$ can form coloured precipitates with metal ions.

Note:
Hydrogen sulphide is a colourless gas that has a rotten egg odour. Inhaling gas is quite dangerous. The sense of smell is fatigued, and it can't be relied on to warn of the gas's continuous existence. Closed containers exposed to heat for an extended period of time may explode violently and rocket.