Question

The liquid which leaves behind a residue on heating is _____.

• A. Alcohol
• B. Bromine
• C. Mercury
• D. Brine

Answer 1

The correct option is D

Brine

Explanation for the correct options

Option (D) - Brine:

1. A brine solution is a salt solution. Water will evaporate when heated, leaving just salt as a residue. This process is called crystallization.
2. In brine solution, there is a defined composition of salt and water. It is a homogeneous solution.

Explanation for the incorrect options:

Option (A) -Alcohol:

• Alcohol has a composition of Carbon$\left(\mathrm{C}\right)$ Hydrogen$\left(\mathrm{H}\right)$ and Oxygen$\left(\mathrm{O}\right)$. When we heat this there will be no residue left.

Option (B) -Bromine$\left(\mathrm{Br}\right)$:

• Bromine is a non-metal, when we heat it there will be no residue.

Option (C) - Mercury$\left(\mathrm{Hg}\right)$:

• Mercury$\left(\mathrm{Hg}\right)$ is also a non-metal, it will also not have any residue after heating it.

Hence, Option (D) Brine is the correct answer.