Question

Hydrogen chloride gas gives dense white fumes with ammonium hydroxide
A.True
B.False

Answer 1

Hint: To solve this question, we need to first discuss the compounds involved in the reaction, i.e. hydrogen chloride gas and ammonium hydroxide. Then, we must discuss the type of reaction these compounds would undergo, and the nature of the product formed, to find the final answer.

Complete Step-by-Step Answer:
Before we move forward with the solution of the given question, let us first understand some important basic concepts.
Hydrogen Chloride gas or hydrochloric acid is a colourless transparent gas which has a pungent odour. At times, this gas may have a slightly yellow colour. This yellow colour is because of the chlorine present in the compound. Chlorine gas by itself is greenish – yellow in colour. This compound is often commercially available as a liquefied colourless gas.
On the other hand, Ammonium hydroxide is formed when ammonia is added to water. This compound is also commonly known as ammonia water or aqua ammonia. Ammonium hydroxide is a weak base. Hence, the degree of dissociation of the ammonium and hydroxide ions is very less. It is basically a colourless liquid which is highly volatile in nature, with a slightly pungent odour.
When these two compounds are made to react with each other, they result in the formation of ammonium chloride and water. This reaction may be regarded as a double displacement reaction. The complete and balanced chemical equation for this reaction can be given as:
\[N{H_4}OH + HCl \to N{H_4}Cl + {H_2}O\]
The ammonium chloride formed in this reaction can be identified as white hygroscopic solid and is collected in the reaction in the form of a white precipitate.

Hence, Option A is the correct option

Note: A double displacement reaction can be explained as a reaction in which the ions of the reacting compounds exchange among themselves to form new compounds. In this particular case, the ammonium and chloride ions combine to form ammonium chloride, while the hydroxide and the hydrogen ions combine to form water.