Question

Which pairs of solutes and solvents can be mixed to form a solution?

(A) MgSO4(s) in water(l) and toluene(l) in benzene(l)

(B) Ethanol(l) in water(l) and CCl4(l) in water(l)

(C) NaCl(s) in benzene(l) and I2(s) in CCl4(l)

(D) Sugar(s) in octane(l) and pentane(l) in methanol(l)

Answer 1

Option A. is the right answer.

MgSO4 dissolves in water because of its complete dissociation in water to form ionic bonds with polar molecules. And on other hand, Benzene which is an excellent organic solvent, and always used commercially as solvent, dissolves another organic compound which is toluene.

option b has incompatible pair of CCl4 and water.

option c has NaCl and benzene as incompatible pair.

option d has sugar and octane as incompatible pair of solute and solvent to form solution. Therefore, option A is correct.