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JEE Solved Example on Liquid State 
JEE Mains 
Q1:  Mole fraction of A vapours above the solution in mixture of ?? and ?? ( ?? ?? = ?? . ?? ) will be 
[Given: ?? ?? ?? = ?????? ???????? and ?? ?? °
= ?????? ???????? ] 
(A) 0.4 
(B) 0.8 
(C) 0.25 
(D) None of these 
Ans: (C) We have, 
?? - ?? ?? + ?? ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 = 0.4 × 100+ 0.6 × 200
 = 40 + 120 = 160 mmHg
?? ?? = 40mmHg
?? ?? = ?? . ?? ?? ?? ?? -
40
160
- 0.25
 
 
Q2:  The exact mathematical expression of Raoult's law is 
(A) 
?? °
-?? ?? ?? °
 
(B) 
?? °
-?? ?? ?? °
=
?? ?? 
(C) 
?? °
-?? ?? ?? ?? =
?? ?? 
(D) 
?? °
-?? ?? ?? °
= ?? × ?? 
Ans: (C) Raoult's Law =
?? 0
-?? ?? 0
=
?? ?? +?? 
?? + ?? ?? =
?? 0
?? 0
- ?? 1 +
?? ?? =
?? 0
?? 0
- ?? ?? ?? =
?? 0
- ?? 0
+ ?? ?? 0
- ?? ?
?? 0
- ?? ?? =
?? ?? Sol 3: (A)P- ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 =
1
1 + 3
· 100+
3
1 + 3
· 80 = 25 + 60 = 85 mmHg
 
 
 
 
Page 2


JEE Solved Example on Liquid State 
JEE Mains 
Q1:  Mole fraction of A vapours above the solution in mixture of ?? and ?? ( ?? ?? = ?? . ?? ) will be 
[Given: ?? ?? ?? = ?????? ???????? and ?? ?? °
= ?????? ???????? ] 
(A) 0.4 
(B) 0.8 
(C) 0.25 
(D) None of these 
Ans: (C) We have, 
?? - ?? ?? + ?? ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 = 0.4 × 100+ 0.6 × 200
 = 40 + 120 = 160 mmHg
?? ?? = 40mmHg
?? ?? = ?? . ?? ?? ?? ?? -
40
160
- 0.25
 
 
Q2:  The exact mathematical expression of Raoult's law is 
(A) 
?? °
-?? ?? ?? °
 
(B) 
?? °
-?? ?? ?? °
=
?? ?? 
(C) 
?? °
-?? ?? ?? ?? =
?? ?? 
(D) 
?? °
-?? ?? ?? °
= ?? × ?? 
Ans: (C) Raoult's Law =
?? 0
-?? ?? 0
=
?? ?? +?? 
?? + ?? ?? =
?? 0
?? 0
- ?? 1 +
?? ?? =
?? 0
?? 0
- ?? ?? ?? =
?? 0
- ?? 0
+ ?? ?? 0
- ?? ?
?? 0
- ?? ?? =
?? ?? Sol 3: (A)P- ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 =
1
1 + 3
· 100+
3
1 + 3
· 80 = 25 + 60 = 85 mmHg
 
 
 
 
Q3:  A mixture contains 1 mole of volatile liquid ?? ( ?? ?? °
= ?????? ???????? ) and 3 moles of volatile 
liquid ?? ( ?? ?? ?? = ???? ???????? ). If solution behaves ideally, the total pressure of the distillate is 
(A) ???? ???????? 
(B) ???? . ???? ?????? 
(C) ???? ???????? 
(D) ???? ???????? 
Ans: (A) ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 
 
Q4:  Assuming each salt to be ???? % dissociated, which of the following will have highest boiling 
point? 
(A) Decimolar ????
?? ( ????
?? )
?? 
(B) Decimolar ???????? ?? 
(C) Decimolar ????
?? ????
?? 
(D) A solution obtained by mixing equal volumes of (B) and (C) 
Ans: (A) ?T
b
= ikm 
?? ?? will be highest for solute for which ??? ?? is highest or i is highest. 
For same degree of dissociation, i ?? n, n is largest for Al
2
( SO
4
)
3
( n = 5) 
Q5:  The vapour pressure of a solvent decreased by ???? ???? of ???? when a non-volatile solute was 
added to the solvent. The mole fraction of solute in solution is 0.2 , what would be mole fraction of 
the solvent if decrease in vapour pressure is ???? ???? of ???? . 
(A) 0.2 
(B) 0.4 
(C) 0.6 
(D) 0.8 
Ans: (C) 
?? 0
-?? ?? 0
= ?? ?? 
??? ?? 0
= ?? ?? ??? 1
??? 2
=
?? ?? 1
?? ?? 2
10
20
=
0.2
?? ?? 2
? ?? ?? 2
= 0.4
 ? ?? ?? = 1 - 0.4 = 0.6
 
 
 
 
 
 
Page 3


JEE Solved Example on Liquid State 
JEE Mains 
Q1:  Mole fraction of A vapours above the solution in mixture of ?? and ?? ( ?? ?? = ?? . ?? ) will be 
[Given: ?? ?? ?? = ?????? ???????? and ?? ?? °
= ?????? ???????? ] 
(A) 0.4 
(B) 0.8 
(C) 0.25 
(D) None of these 
Ans: (C) We have, 
?? - ?? ?? + ?? ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 = 0.4 × 100+ 0.6 × 200
 = 40 + 120 = 160 mmHg
?? ?? = 40mmHg
?? ?? = ?? . ?? ?? ?? ?? -
40
160
- 0.25
 
 
Q2:  The exact mathematical expression of Raoult's law is 
(A) 
?? °
-?? ?? ?? °
 
(B) 
?? °
-?? ?? ?? °
=
?? ?? 
(C) 
?? °
-?? ?? ?? ?? =
?? ?? 
(D) 
?? °
-?? ?? ?? °
= ?? × ?? 
Ans: (C) Raoult's Law =
?? 0
-?? ?? 0
=
?? ?? +?? 
?? + ?? ?? =
?? 0
?? 0
- ?? 1 +
?? ?? =
?? 0
?? 0
- ?? ?? ?? =
?? 0
- ?? 0
+ ?? ?? 0
- ?? ?
?? 0
- ?? ?? =
?? ?? Sol 3: (A)P- ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 =
1
1 + 3
· 100+
3
1 + 3
· 80 = 25 + 60 = 85 mmHg
 
 
 
 
Q3:  A mixture contains 1 mole of volatile liquid ?? ( ?? ?? °
= ?????? ???????? ) and 3 moles of volatile 
liquid ?? ( ?? ?? ?? = ???? ???????? ). If solution behaves ideally, the total pressure of the distillate is 
(A) ???? ???????? 
(B) ???? . ???? ?????? 
(C) ???? ???????? 
(D) ???? ???????? 
Ans: (A) ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 
 
Q4:  Assuming each salt to be ???? % dissociated, which of the following will have highest boiling 
point? 
(A) Decimolar ????
?? ( ????
?? )
?? 
(B) Decimolar ???????? ?? 
(C) Decimolar ????
?? ????
?? 
(D) A solution obtained by mixing equal volumes of (B) and (C) 
Ans: (A) ?T
b
= ikm 
?? ?? will be highest for solute for which ??? ?? is highest or i is highest. 
For same degree of dissociation, i ?? n, n is largest for Al
2
( SO
4
)
3
( n = 5) 
Q5:  The vapour pressure of a solvent decreased by ???? ???? of ???? when a non-volatile solute was 
added to the solvent. The mole fraction of solute in solution is 0.2 , what would be mole fraction of 
the solvent if decrease in vapour pressure is ???? ???? of ???? . 
(A) 0.2 
(B) 0.4 
(C) 0.6 
(D) 0.8 
Ans: (C) 
?? 0
-?? ?? 0
= ?? ?? 
??? ?? 0
= ?? ?? ??? 1
??? 2
=
?? ?? 1
?? ?? 2
10
20
=
0.2
?? ?? 2
? ?? ?? 2
= 0.4
 ? ?? ?? = 1 - 0.4 = 0.6
 
 
 
 
 
 
Q6:  Elevation of boiling point of 1 molar aqueous glucose solution (density = ?? . ?? ?? /???? ) is 
(A) ?? ?? 
(B) ?? . ???? ?? ?? 
(C) ?? . ???? ?? ?? 
(D) ?? . ???? ?? ?? 
Ans: (D) For every 1 L solution, moles of glucose = 1, weight of so  
?? = 1.2 × 1000 = 1.2 kg 
 Weight of glucose = 180 g
 Weight of solvent = 1200- 180 = 1020 g
 ? molality -
1
1.02
- 0.98 m
 ? ??? ?? = ?? ?? ?? = 0.98 K
b
 
 
Q7:  What will be the molecular weight of ???????? ?? determined in its aq. solution experimentally 
from depression of freezing point? 
(A) 111 
(B) < ?????? 
(C) > ?????? 
(D) Data insufficient 
Sol 7: (B) i =
 Normal molecular wt 
 Observed molecular wt 
> 1 
? Observed molecular wt < normal molecular wt. 
 
Q8 1.0 molal aqueous solution of an electrolyte ?? ?? ?? ?? is ???? % ionized. The boiling point of the 
solution at ?? ?????? is ?? ?? ( ?? ?? ?? )
= ?? . ???? ?? ???? ?????? ?? 
(A) ?????? . ???? ?? 
(B) ?????? ?? 
(C) ?????? . ?? ?? 
(D) ?????? . ???? ?? 
 Ans: ( ?? ) ?? 2
?? 3
? 2?? +
+ 3?? -
?? = 0.6
?? = 5
i - 1 + ( n - 1) ?? = 3.4
??? ?? = iK
b
m
 = 3.4 × 0.52 × 1
 = 1.768 K
 T
b
= 373 + 1.768 = 374.768 K
 
 
 
 
Page 4


JEE Solved Example on Liquid State 
JEE Mains 
Q1:  Mole fraction of A vapours above the solution in mixture of ?? and ?? ( ?? ?? = ?? . ?? ) will be 
[Given: ?? ?? ?? = ?????? ???????? and ?? ?? °
= ?????? ???????? ] 
(A) 0.4 
(B) 0.8 
(C) 0.25 
(D) None of these 
Ans: (C) We have, 
?? - ?? ?? + ?? ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 = 0.4 × 100+ 0.6 × 200
 = 40 + 120 = 160 mmHg
?? ?? = 40mmHg
?? ?? = ?? . ?? ?? ?? ?? -
40
160
- 0.25
 
 
Q2:  The exact mathematical expression of Raoult's law is 
(A) 
?? °
-?? ?? ?? °
 
(B) 
?? °
-?? ?? ?? °
=
?? ?? 
(C) 
?? °
-?? ?? ?? ?? =
?? ?? 
(D) 
?? °
-?? ?? ?? °
= ?? × ?? 
Ans: (C) Raoult's Law =
?? 0
-?? ?? 0
=
?? ?? +?? 
?? + ?? ?? =
?? 0
?? 0
- ?? 1 +
?? ?? =
?? 0
?? 0
- ?? ?? ?? =
?? 0
- ?? 0
+ ?? ?? 0
- ?? ?
?? 0
- ?? ?? =
?? ?? Sol 3: (A)P- ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 =
1
1 + 3
· 100+
3
1 + 3
· 80 = 25 + 60 = 85 mmHg
 
 
 
 
Q3:  A mixture contains 1 mole of volatile liquid ?? ( ?? ?? °
= ?????? ???????? ) and 3 moles of volatile 
liquid ?? ( ?? ?? ?? = ???? ???????? ). If solution behaves ideally, the total pressure of the distillate is 
(A) ???? ???????? 
(B) ???? . ???? ?????? 
(C) ???? ???????? 
(D) ???? ???????? 
Ans: (A) ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 
 
Q4:  Assuming each salt to be ???? % dissociated, which of the following will have highest boiling 
point? 
(A) Decimolar ????
?? ( ????
?? )
?? 
(B) Decimolar ???????? ?? 
(C) Decimolar ????
?? ????
?? 
(D) A solution obtained by mixing equal volumes of (B) and (C) 
Ans: (A) ?T
b
= ikm 
?? ?? will be highest for solute for which ??? ?? is highest or i is highest. 
For same degree of dissociation, i ?? n, n is largest for Al
2
( SO
4
)
3
( n = 5) 
Q5:  The vapour pressure of a solvent decreased by ???? ???? of ???? when a non-volatile solute was 
added to the solvent. The mole fraction of solute in solution is 0.2 , what would be mole fraction of 
the solvent if decrease in vapour pressure is ???? ???? of ???? . 
(A) 0.2 
(B) 0.4 
(C) 0.6 
(D) 0.8 
Ans: (C) 
?? 0
-?? ?? 0
= ?? ?? 
??? ?? 0
= ?? ?? ??? 1
??? 2
=
?? ?? 1
?? ?? 2
10
20
=
0.2
?? ?? 2
? ?? ?? 2
= 0.4
 ? ?? ?? = 1 - 0.4 = 0.6
 
 
 
 
 
 
Q6:  Elevation of boiling point of 1 molar aqueous glucose solution (density = ?? . ?? ?? /???? ) is 
(A) ?? ?? 
(B) ?? . ???? ?? ?? 
(C) ?? . ???? ?? ?? 
(D) ?? . ???? ?? ?? 
Ans: (D) For every 1 L solution, moles of glucose = 1, weight of so  
?? = 1.2 × 1000 = 1.2 kg 
 Weight of glucose = 180 g
 Weight of solvent = 1200- 180 = 1020 g
 ? molality -
1
1.02
- 0.98 m
 ? ??? ?? = ?? ?? ?? = 0.98 K
b
 
 
Q7:  What will be the molecular weight of ???????? ?? determined in its aq. solution experimentally 
from depression of freezing point? 
(A) 111 
(B) < ?????? 
(C) > ?????? 
(D) Data insufficient 
Sol 7: (B) i =
 Normal molecular wt 
 Observed molecular wt 
> 1 
? Observed molecular wt < normal molecular wt. 
 
Q8 1.0 molal aqueous solution of an electrolyte ?? ?? ?? ?? is ???? % ionized. The boiling point of the 
solution at ?? ?????? is ?? ?? ( ?? ?? ?? )
= ?? . ???? ?? ???? ?????? ?? 
(A) ?????? . ???? ?? 
(B) ?????? ?? 
(C) ?????? . ?? ?? 
(D) ?????? . ???? ?? 
 Ans: ( ?? ) ?? 2
?? 3
? 2?? +
+ 3?? -
?? = 0.6
?? = 5
i - 1 + ( n - 1) ?? = 3.4
??? ?? = iK
b
m
 = 3.4 × 0.52 × 1
 = 1.768 K
 T
b
= 373 + 1.768 = 374.768 K
 
 
 
 
Q9:  The van't Hoff factor for a dilute aqueous solution of glucose is 
(A) Zero 
(B) 1.0 
(C) 1.5 
(D) 2.0 
Ans:  (B) Since, glucose does not dissociate, ?? - 0 ? ?? - 1 
 
Q10:  The correct relationship between the boiling points of very dilute solution of ???????? ?? ( ?? ?? ?? ) 
and ???????? ?? ( ?? ?? ?? ) having the same molar concentration is 
(A) ?? ?? = ?? ?? 
(B) ?? ?? > ?? ?? 
(C) ?? ?? < ?? ?? 
(D) ?? ?? = ?? ?? 
Ans: (B) ??? ?? = ?? ?? ?? ?? 
For ?? equimolar solution are equimolal also very dilute. 
 ? ??? ?? ? i
i
AlCl
3
> i
CaCl
2
 (as i ?? n, ?? NCl
3
= 4, n
CaCl
2
= 2 ) 
?T
b
AlCl
3
> ?T
b
CaCl
2
 T
1
> T
2
 
 
 
Q11: A 0.001 molal solution of a complex [MA] in water has the freezing point of -?? . ????????
°
?? . 
Assuming ?????? % ionization of the complex salt and ?? ?? for ?? ?? ?? = ?? . ???? ????
-?? , what the correct 
representation for the complex 
(A) [????
?? ] 
(B) [????
?? ]?? 
(C) [????
?? ]?? ?? 
(D) [????
?? ]?? ?? 
Ans: (C) ??? ?? = ?? ?? ?? ?? 
i -
??? 1
?? 1
?? =
0.0054
1.86 × 0.001
= 2.903
?? - 1
 ? 1 + ( ?? - 1) ?? - 2.9 ˜ 3
?? - 1 = 2
?? = 3
 
? Out of the given options, only ( C ) is possible 
 
Page 5


JEE Solved Example on Liquid State 
JEE Mains 
Q1:  Mole fraction of A vapours above the solution in mixture of ?? and ?? ( ?? ?? = ?? . ?? ) will be 
[Given: ?? ?? ?? = ?????? ???????? and ?? ?? °
= ?????? ???????? ] 
(A) 0.4 
(B) 0.8 
(C) 0.25 
(D) None of these 
Ans: (C) We have, 
?? - ?? ?? + ?? ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 = 0.4 × 100+ 0.6 × 200
 = 40 + 120 = 160 mmHg
?? ?? = 40mmHg
?? ?? = ?? . ?? ?? ?? ?? -
40
160
- 0.25
 
 
Q2:  The exact mathematical expression of Raoult's law is 
(A) 
?? °
-?? ?? ?? °
 
(B) 
?? °
-?? ?? ?? °
=
?? ?? 
(C) 
?? °
-?? ?? ?? ?? =
?? ?? 
(D) 
?? °
-?? ?? ?? °
= ?? × ?? 
Ans: (C) Raoult's Law =
?? 0
-?? ?? 0
=
?? ?? +?? 
?? + ?? ?? =
?? 0
?? 0
- ?? 1 +
?? ?? =
?? 0
?? 0
- ?? ?? ?? =
?? 0
- ?? 0
+ ?? ?? 0
- ?? ?
?? 0
- ?? ?? =
?? ?? Sol 3: (A)P- ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 =
1
1 + 3
· 100+
3
1 + 3
· 80 = 25 + 60 = 85 mmHg
 
 
 
 
Q3:  A mixture contains 1 mole of volatile liquid ?? ( ?? ?? °
= ?????? ???????? ) and 3 moles of volatile 
liquid ?? ( ?? ?? ?? = ???? ???????? ). If solution behaves ideally, the total pressure of the distillate is 
(A) ???? ???????? 
(B) ???? . ???? ?????? 
(C) ???? ???????? 
(D) ???? ???????? 
Ans: (A) ?? - ?? ?? ?? ?? 0
+ ?? ?? ?? ?? 0
 
 
Q4:  Assuming each salt to be ???? % dissociated, which of the following will have highest boiling 
point? 
(A) Decimolar ????
?? ( ????
?? )
?? 
(B) Decimolar ???????? ?? 
(C) Decimolar ????
?? ????
?? 
(D) A solution obtained by mixing equal volumes of (B) and (C) 
Ans: (A) ?T
b
= ikm 
?? ?? will be highest for solute for which ??? ?? is highest or i is highest. 
For same degree of dissociation, i ?? n, n is largest for Al
2
( SO
4
)
3
( n = 5) 
Q5:  The vapour pressure of a solvent decreased by ???? ???? of ???? when a non-volatile solute was 
added to the solvent. The mole fraction of solute in solution is 0.2 , what would be mole fraction of 
the solvent if decrease in vapour pressure is ???? ???? of ???? . 
(A) 0.2 
(B) 0.4 
(C) 0.6 
(D) 0.8 
Ans: (C) 
?? 0
-?? ?? 0
= ?? ?? 
??? ?? 0
= ?? ?? ??? 1
??? 2
=
?? ?? 1
?? ?? 2
10
20
=
0.2
?? ?? 2
? ?? ?? 2
= 0.4
 ? ?? ?? = 1 - 0.4 = 0.6
 
 
 
 
 
 
Q6:  Elevation of boiling point of 1 molar aqueous glucose solution (density = ?? . ?? ?? /???? ) is 
(A) ?? ?? 
(B) ?? . ???? ?? ?? 
(C) ?? . ???? ?? ?? 
(D) ?? . ???? ?? ?? 
Ans: (D) For every 1 L solution, moles of glucose = 1, weight of so  
?? = 1.2 × 1000 = 1.2 kg 
 Weight of glucose = 180 g
 Weight of solvent = 1200- 180 = 1020 g
 ? molality -
1
1.02
- 0.98 m
 ? ??? ?? = ?? ?? ?? = 0.98 K
b
 
 
Q7:  What will be the molecular weight of ???????? ?? determined in its aq. solution experimentally 
from depression of freezing point? 
(A) 111 
(B) < ?????? 
(C) > ?????? 
(D) Data insufficient 
Sol 7: (B) i =
 Normal molecular wt 
 Observed molecular wt 
> 1 
? Observed molecular wt < normal molecular wt. 
 
Q8 1.0 molal aqueous solution of an electrolyte ?? ?? ?? ?? is ???? % ionized. The boiling point of the 
solution at ?? ?????? is ?? ?? ( ?? ?? ?? )
= ?? . ???? ?? ???? ?????? ?? 
(A) ?????? . ???? ?? 
(B) ?????? ?? 
(C) ?????? . ?? ?? 
(D) ?????? . ???? ?? 
 Ans: ( ?? ) ?? 2
?? 3
? 2?? +
+ 3?? -
?? = 0.6
?? = 5
i - 1 + ( n - 1) ?? = 3.4
??? ?? = iK
b
m
 = 3.4 × 0.52 × 1
 = 1.768 K
 T
b
= 373 + 1.768 = 374.768 K
 
 
 
 
Q9:  The van't Hoff factor for a dilute aqueous solution of glucose is 
(A) Zero 
(B) 1.0 
(C) 1.5 
(D) 2.0 
Ans:  (B) Since, glucose does not dissociate, ?? - 0 ? ?? - 1 
 
Q10:  The correct relationship between the boiling points of very dilute solution of ???????? ?? ( ?? ?? ?? ) 
and ???????? ?? ( ?? ?? ?? ) having the same molar concentration is 
(A) ?? ?? = ?? ?? 
(B) ?? ?? > ?? ?? 
(C) ?? ?? < ?? ?? 
(D) ?? ?? = ?? ?? 
Ans: (B) ??? ?? = ?? ?? ?? ?? 
For ?? equimolar solution are equimolal also very dilute. 
 ? ??? ?? ? i
i
AlCl
3
> i
CaCl
2
 (as i ?? n, ?? NCl
3
= 4, n
CaCl
2
= 2 ) 
?T
b
AlCl
3
> ?T
b
CaCl
2
 T
1
> T
2
 
 
 
Q11: A 0.001 molal solution of a complex [MA] in water has the freezing point of -?? . ????????
°
?? . 
Assuming ?????? % ionization of the complex salt and ?? ?? for ?? ?? ?? = ?? . ???? ????
-?? , what the correct 
representation for the complex 
(A) [????
?? ] 
(B) [????
?? ]?? 
(C) [????
?? ]?? ?? 
(D) [????
?? ]?? ?? 
Ans: (C) ??? ?? = ?? ?? ?? ?? 
i -
??? 1
?? 1
?? =
0.0054
1.86 × 0.001
= 2.903
?? - 1
 ? 1 + ( ?? - 1) ?? - 2.9 ˜ 3
?? - 1 = 2
?? = 3
 
? Out of the given options, only ( C ) is possible 
 
 
Q12:  The vapour pressure of a solution of a non -volatile electrolyte ?? in a solvent ?? is ???? % of the 
vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is 
0.3 times the molecular weight of solute, the weight ratio of the solvent and solute are 
(A) 0.15 
(B) 5.7 
(C) 0.2 
(D) 4.0 
Sol 12: (B) We have 
?? = 0.95?? 0
?? 0
- ?? ?? 0
- ?? ?? - 0.05
?? ?? ?? ?? - 0.05
?? ?? ?? ?? +
?? ?? ?? ?? ?? ?? ?? ?? -
1
20
?? ?? ?? ?? +
1
20
?? ?? ?? ?? 19
20
?? ?? ?? ?? -
1
20
?? ?? ?? ?? ?? ?? ?? ?? - 19.
?? ?? ?? ?? 19 × 0.3 - 5.7
 
 
 
Q13:  The vapour pressure of a saturated solution of sparingly soluble salt ( ?????? ?? ) was 
???? . ???? ???????? at ????
°
?? . If the vapour pressure of pure ?? ?? ?? is ???? . ???? ???????? at ?????? ?? , what is the 
solubility of sparingly soluble salt ?????? ?? in mole/litre 
(A) ?? . ???? × ????
?? 
(B) ?? . ???? × ????
?? 
(C) ?? . ???? × ????
?? 
(D) ?? . ???? × ????
?? 
Ans: (A) XCl
3
? X + 3Cl 
?? - 4 
?? - 1 
?? = 1 + 3 = 5 
?? ?? -
?? 0
- ?? ?? 0
 
?? ?? =
17.25 - 17.2
17.25 × 4
 
?? ?? = 7.24 × 10
-4
=
?? ?? + ?? 
For n + N - 1, n - 7.24 × 10
-4
 
?? = 0.999 
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