Chemistry Class-11: Chapter – 1. Some Basic Concepts of Chemistry – Part-5 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question-32:

The density of 3 molar solution of is 1.110 g mL – 1. Calculate the molarity of the solution

Answer:

molal solution of means that of are dissolved in of solvent.

∴ Mass of

(Since density of solution = 1.110g mL – 1)

Since solution contains of

Question-33:

Volume of a solution changes with change in temperature, then, will the molality of the solution be affected by temperature? Give reason for your answer.

Answer:

No, Molality of solution does not change with temperature since mass remains unaffected with temperature.

Question-34:

If of dissolves in of , calculate the mole fraction of each component in the solution. Also, determine the molarity of solution (specific gravity of solution is .

Answer:

Number of moles of

Mass of solution

Volume of solution

Question-35:

The reactant which is entirely consumed in reaction is known as limiting reagent. In the reaction , when moles of A react with moles of B, then

(i) Which is the limiting reagent?

(ii) Calculate the amount of C formed?

Answer:

According to the above equation, mols of ‘A’ require mols of ‘B’ for the reaction.

Hence, for

But we have only of ‘B’ , hence, ‘B’ is the limiting reagent. So amount of ‘C’ formed is determined by amount of ‘B’ .

Since of ‘B’ give mols of ‘C’ . Hence 6 mols of ‘B’ will give