Question

Water-gas is a mixture of which gases?
P: Carbon dioxide
Q: Hydrogen
R: Carbon monoxide
A.)Q and R
B.)P and Q
C.)P and R
D.)P, Q and R

Answer 1

Water-gas is obtained by the reaction of steam on red-hot coke. It is an endothermic reaction that takes energy externally to carry out the reaction to produce water-gas. Water-gas is a poisonous gas due to the presence of carbon monoxide.

Complete step by step answer:
The synthesis of water-gas is as follows.

${{H}_{2}}O+C\to \underbrace{{{H}_{2}}+CO}_{Water-gas}$

Water in the form of steam reacts with red-hot coke and produces hydrogen gas and carbon monoxide.
Therefore water-gas contains hydrogen gas and carbon monoxide.

Coming to the given options, option B, P and Q means carbon dioxide and hydrogen. But water-gas does not contain carbon dioxide. So, option B is wrong.
Coming to option C, P and R, means carbon dioxide and carbon monoxide. But carbon dioxide is not present in water-gas. So, option C is wrong.
Coming to option D, P, Q and R, carbon dioxide, hydrogen and carbon monoxide. But water-gas contains only two gases. So, option D is wrong.
Coming to option A, Q and R, Hydrogen and carbon monoxide. Water-gas contains Hydrogen and carbon monoxide.

Hence, the correct answer is option A.

Additional Information
(i)Water-gas, also called synthesis gas, is a fuel gas used in various industries to prepare organic chemicals.
(ii)Water-gas is used in welding, glassmaking, and additional high-temperature industrial applications.

Note:
Water-gas is different from producer gas. Producer gas contains nitrogen and hydrogen. Water gas high calorific value when compared to producer gas. Because of high calorific value water-gas is used in industries.