NEET Practice Questions (MCQs) with Answers & Solutions

A solution is a homogeneous mixture composed of a solute dissolved in a solvent. In zinc amalgam, the solute (zinc) is a solid metal, and the solvent (mercury) is a liquid metal. Hence, zinc amalgam represents a solution where the physical states of the solute and solvent are solid and liquid, respectively.

In a solution, the solute is the substance present in a lesser amount, while the solvent is the substance present in a greater amount. For a solution of camphor (solid) in nitrogen gas (Nâ‚‚), camphor is the solute in the solid state, and nitrogen gas is the solvent in the gaseous state.

Sodium amalgam (a homogeneous alloy of sodium and mercury) and the solution of urea in water are examples of homogeneous mixtures with different physical states of the solvent (solid and liquid, respectively).

Among the given options, pentane-1,2,3,4-tetraol (also known as pentaerythritol) has the maximum number of hydroxyl (-OH) groups, making it the most soluble in water due to its ability to form hydrogen bonds with water molecules.

Hexan-1-ol has the longest hydrocarbon chain and the least number of hydroxyl (-OH) groups among the given options, making it the least soluble in water due to its low polarity and inability to form strong hydrogen bonds.

Normality does not require the density of the solution to be converted from molarity. It depends only on the equivalent weight of the solute and its molar concentration.

To convert molality into percentage by volume (% v/v), the density of the solution is required. This is because molality is a unit of concentration based on the mass of solute per unit mass of solvent, while % v/v is based on the volume of solute per unit volume of solution.