Answer:
Water for;
(a) NaCl
(b) HF
(c) (NH₄)₂SO₄
Hexane for;
(a) Octane
Explanation:
In chemistry there is a Rue of Thumb, "Like Dissolves Like" according to which polar compounds will dissolve in polar solvents and non-polar compounds will dissolve in non-polar solvents.
In given statement two solvents are given.
(1) Water: Water is a polar compound. It has a polar bond and a bent shape, hence has a net dipole moment.
(2) Hexane: Hexane is nonpolar because the electronegativity difference between the carbon atom and hydrogen atom is very less i.e. 0.4.
Therefore, polar solutes like NaCl (ionic), HF (highly polar) and (NH₄)₂SO₄ (ionic compound) will dissolve in water and Octane (C₈H₁₈ nonpolar) will dissolve in hexane respectively.
