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Class 9 Chemistry Solutions


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Q13. What is Raoults law. Give its three statements. How this law can help us to understand the ideality of a solution.
Q13. What is Raoults law. Give its three statements. How this law can help us to understand the ideality of a solution.

Q13.WhatisRaoultslaw.Giveitsthreestatements.Howthislawcanhelpustounderstandtheidealityofasolution.Q13. What is Raoults law. Give its three statements. How this law can help us to understand the ideality of a solution.

1. A solution contains 50 \mathrm{~g} of sugar dissolved in 450 \mathrm{~g} of water. What is concentration of this solution?
1. A solution contains  50 \mathrm{~g}  of sugar dissolved in  450 \mathrm{~g}  of water. What is concentration of this solution?

1.Asolutioncontains50 gofsugardissolvedin450 gofwater.Whatisconcentrationofthissolution?1. A solution contains 50 \mathrm{~g} of sugar dissolved in 450 \mathrm{~g} of water. What is concentration of this solution?

Worked Example 2: The pH of a solution is 9.63. Compute its hydrogen ion concentration.
Worked Example 2: The pH of a solution is 9.63. Compute its hydrogen ion concentration.

WorkedExample2:ThepHofasolutionis9.63.Computeitshydrogenionconcentration.Worked Example 2: The pH of a solution is 9.63. Compute its hydrogen ion concentration.

(c) Calculate the concentration of a solution in terms of molality which is obtained by mixing 250 \mathrm{~g} of 20 \% solution of \mathrm{NaCl} with 200 \mathrm{~g} of 40 \% solution of \mathrm{NaCl} .
(c) Calculate the concentration of a solution in terms of molality which is obtained by mixing  250 \mathrm{~g}  of  20 \%  solution of  \mathrm{NaCl}  with  200 \mathrm{~g}  of  40 \%  solution of  \mathrm{NaCl} .

(c)Calculatetheconcentrationofasolutionintermsofmolalitywhichisobtainedbymixing250 gof20%solutionofNaClwith200 gof40%solutionofNaCl.(c) Calculate the concentration of a solution in terms of molality which is obtained by mixing 250 \mathrm{~g} of 20 \% solution of \mathrm{NaCl} with 200 \mathrm{~g} of 40 \% solution of \mathrm{NaCl} .

Q 23. 3 g of a non-volatile non-electrolyte solute X are dissolved in 50 \mathrm{~g} of ether (molar mass = 74) at 293 \mathrm{~K} . The vapour pressure of ether falls from 442 torr to 426 torr under these conditions. Calculate the molar mass of solute X .(Ans: 122.6 \mathrm{~g} \mathrm{~mol}^{-1} )
Q 23. 3 g of a non-volatile non-electrolyte solute   X   are dissolved in  50 \mathrm{~g}  of ether (molar mass = 74) at  293 \mathrm{~K} . The vapour pressure of ether falls from 442 torr to 426 torr under these conditions. Calculate the molar mass of solute   X  .(Ans:  122.6 \mathrm{~g} \mathrm{~mol}^{-1}  )

Q23.3gofanonvolatilenonelectrolytesoluteXaredissolvedin50 gofether(molarmass=74)at293 K.Thevapourpressureofetherfallsfrom442torrto426torrundertheseconditions.CalculatethemolarmassofsoluteX.(Ans:122.6 g mol1)Q 23. 3 g of a non-volatile non-electrolyte solute X are dissolved in 50 \mathrm{~g} of ether (molar mass = 74) at 293 \mathrm{~K} . The vapour pressure of ether falls from 442 torr to 426 torr under these conditions. Calculate the molar mass of solute X .(Ans: 122.6 \mathrm{~g} \mathrm{~mol}^{-1} )

9. Tyndall effect is shown by:(a) sugar solution(b) paints(c) jelly(d) chalk solution
9. Tyndall effect is shown by:(a) sugar solution(b) paints(c) jelly(d) chalk solution

9.Tyndalleffectisshownby:(a)sugarsolution(b)paints(c)jelly(d)chalksolution9. Tyndall effect is shown by:(a) sugar solution(b) paints(c) jelly(d) chalk solution

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