Step 1: Understanding the phases of matter.
A solution in which one phase (such as a liquid) is dissolved in another phase (such as a gas) is termed a liquid in gas solution. Chloroform dissolved in nitrogen is a good example, as nitrogen is a gas and chloroform is a liquid.
Step 2: Analyzing the options.
(A) Liquid in gas: This is the correct answer. Chloroform (liquid) is dissolved in nitrogen (gas).
(B) Liquid in solid: This is incorrect, as chloroform is not dissolved in a solid.
(C) Liquid in liquid: This is incorrect. Chloroform is not dissolved in another liquid but in a gas.
(D) Gas in liquid: This is incorrect, as the solution is a liquid dissolved in a gas, not the reverse.
Step 3: Conclusion.
The correct answer is (A) Liquid in gas.