Q1: Number of gm moles of solute dissolved in one litre of a solution is called its

ANS:B - molarity

The number of gram moles of solute dissolved in one liter of a solution is called its molarity. Molarity (M) is a measure of the concentration of a solute in a solution, expressed as the number of moles of solute per liter of solution. It is one of the most commonly used concentration units in chemistry. Molarity is a measure of the concentration of a solute in a solution. It is defined as the number of moles of solute dissolved in one liter of solution. Mathematically, it is represented as moles of solute (in mol) divided by the volume of solution (in liters). The formula for calculating molarity (M) is: 𝑀=moles of solutevolume of solution in litersM=volume of solution in litersmoles of solute​ Molarity is expressed in units of moles per liter (mol/L), or sometimes written as molar (M). It's a crucial parameter in chemistry because it helps describe how much solute is present in a given volume of solvent. Here's an example: Suppose you have 0.5 moles of sodium chloride (NaCl) dissolved in 1 liter of water. To find the molarity of this solution, you'd use the formula: 𝑀=0.5 mol1 L=0.5 MM=1 L0.5 mol​=0.5 M This means the molarity of the solution is 0.5 moles of NaCl per liter of solution. In other words, for every liter of solution, there are 0.5 moles of NaCl dissolved in it. Molarity allows chemists to accurately describe and quantify the concentration of solutions, which is crucial for various chemical reactions and analytical techniques.