1st Year Chemistry Chapter 9 Solved Exercise PDF

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In this post, I am sharing FSC 1st Year Chemistry Chapter 9 Solved Exercise & Numericals Notes PDF for the students of FSC Part 1. The name of 11th Chemistry Chapter 9 is Solutions. So the students can download Solutions Chapter Solved Exercise in PDF format from here. This file contains 20 pages. These Chemistry Notes are for all the boards working under Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Here are the complete 1st Year Chemistry Notes.

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11th Class Chemistry Chapter 9 “Solutions” Solved Exercise PDF Download

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The molal boiling constant is the ratio of the elevation in boiling point to;

a) molarity
b) molality
c) mole fraction of solvent
d) mole fraction of solute

Colligative properties are the properties of;

a) Dilute solution which behave as nearly ideal solution
b) concentrated solutions which behave as nearly non ideal solution
c) both a and b
d) neither a nor b

Fill in the blanks:

Number of molecules of sugar in 1dm³ of 1 M sugar solution is 6.02x 10²³
the hydration energy of Br^–ion is less then that of F^– ion
colligative properties are used to calculate molar mass of compound
when an azeotropic mixture is distilled, it composistion remain constant.

Define homogeneous phase:

“ A mixture of two or more different chemical substances with fixed composition and uniform properties throughout the mass of the sample is called homogeneous phase”.

Example;

If small amount of sugar is added to water, sugar is dissolved and the whole mixture is in liquid state with sweet taste. These properties remain uniform throughout the sample. Hence, sugar solution is said to be homogeneous phase.

Define concentrated solution.

“A solution containing relatively larger amount of solute dissolved in solvent is called concentrated solution”

Example;

1dm³solution containing 50g dissolved sugar is concentrated than 1 dm³ solution conataining 20g dissolved sugar.

Comparison between molar solution and molal solution

Molar solution	Molal solution
The solution in which 1 mole of solute has been dissolved per dm³of the solution.	The solution in which 1 mole of solute is dissolved in 1 kilogram of a solvent.
Molar solution of a substance (say urea) is concentrated	Molal solution of a substance (say urea) is dilute.
The concentration of molar solution vary with the temperature, as volume of solution depends upon temperature.	the concentration of molal solution do not vary with the temperature because masses of solute and solvent do not depend upon temperature
the concentration of molar solution is calculated by formula M = no. of mole of solute/ Volume of solution in dm³	The concentration of molal solution is calculated is by formula. m = no. of mole of solute/mass of solvent in kg