pm = 10 m ass of the solution - karnataka examination...
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n1. Molarity = 2
L
nv
2. Molality = 2n
( )1 K gw
3 P 61 0w ×3. Ppm = 2 1 0wM a s s o f t h e s o l u t i o n
×
4. Mole fraction of solute =2
1 2
nn n+
5. Mole fraction of solvent =1
1 2
nn n+
6. Mass percentage of solute = 2 1 0 0wM a s s o f s o l u t i o n
×
7 ) . . . . . . .A H AP K x= H ’ l f l bilit
•P =0 0
A A B Bx p x p+ ‐ Ideal binary solution of liquidsRaoult’s law.
7 ) . . . . . . .A H AP K x Henry’s law of gas solubility
02
01 2
p p np n n−
=+
•Raoult’s law of the solution ofa nonvolatile solute.
1 In 91% Ethanol by mass the mole1. In 91% Ethanol by mass, the molefraction of Ethanol is :
a) 0.8 b) 0.7 c) 0.9 d) 0.6
2) If ‘x’ molal solution of a compound in benzene has mole fraction of solute benzene has mole fraction of solute equal to 0.2, the value of ‘ x ‘ is :
a) 14 b) 3.2 c) 1.4 d) 2.0
→ =1000
1 12.5 .78
x moles Kg of Benzene moles
M.F. of Solute = ⇒ =0.2 . . 0.8M F of Benzene
→0.8 0.2moles of Benzene moles of solute
12.5 moles ×→
0.2 12.53.2
ANS (b)
→ 3.20.8
ANS : (b)
3) The volumes of 4 M HCl and 10M HClrequired to prepare 1 litre of 6 M HCl is :required to prepare 1 litre of 6 M HCl is :
a)0 75L of 4 M HCl + 0 25L of 10 HCla)0.75L of 4 M HCl + 0.25L of 10 HCl
b)0.67L of 4 M HCl +0.33L of 10M HCl
c) 0.25L of 4 M HCl +0.75L of 10 M HCl
d) 0.80L of 4 M HCl + 0.20 L of 10 M HCl
4) Which of the following aqueous Solution should have the highest boiling g gpoint ?
a)1 M NaOH
b) 1 M Na2SO4
c) 1 M NH4NO3
d) 1 M KNO3d) 1 M KNO3
5. The values of Vant Hoff’s factor for5. The values of Vant Hoff s factor forKCl, NaCl and K2SO4 are respectively
) 2 2 b) 2 2 3 a) 2,2,1 b) 2,2,3
) 1 1 2 d) 1 2 1c) 1, 1, 2 d) 1, 2,1
6) 4 L of 0.02M solution of NaCl was dilutedby adding 1L of water. The molarity of thesolution is :
a) 0.004 b) 0.008
c) 0.012 d) 0.016
7) The Molarity of HCl if the density of 7) The Molarity of HCl if the density of the Solution is 1.825g/cc is :
)25 b) 50 ) 30 d) 40a)25 b) 50 c) 30 d) 40
8) 12g of urea is dissolved in 1L of the Solution and 68.4g of Sucrose was dissolved in 1L
f h l i Th l i l i f of the solution. The relative lowering of vapourpressure of urea solution is :
a) greater than Sucrose solutionb) d bl th t f S l tib) double that of Sucrose solutionc) less than Sucrose solutiond) l t th t f S l tid) equal to that of Sucrose solution
9) Ethylene glycol is used as antifreeze in a cold climate Mass antifreeze in a cold climate. Mass of ethylene glycol to be dissolved in 4 Kg of water to prevent it from 4 Kg of water to prevent it from freezing at -5.60 will be
1⎡ ⎤
a) 500g b) 624g
11.86fK K Kg mol−⎡ ⎤=⎣ ⎦
a) 500g b) 624g
c) 744 g d) 800gc) 744 g d) 800g
∆ = ×f fT K m
= ×5.6 1.86 m
= ⇒3. 3 /m moles Kg
12 / 4or moles Kg/o moles g
× =12 62 74Kg=2 62CH OH M2
2CH OH
ANS : ( c )
10) If Sodium sulphate is completely ionized in solution, the value of
fT∆
when 0.01 mol of Sod sulphate is dissolved in 1 kg of water is
( )1.86fK =
a) 0.0744 b) 0.0186
c) 0.0372 d) 0.0558
11)The elevation in the B.pt of a solutionof 13 44g of CuCl in 1kg of water isof 13.44g of CuCl2 in 1kg of water is( Kb=0.52K kg mol-1 and Mol mass of CuCl =134 4)CuCl2=134.4)
a)0.05 b) 0.1 c) 0.16 d) 0.21) ) ) )
12)The molarity of the resulting S l ti bt i d b i i 4L f 0 2 M Solution obtained by mixing 4L of 0.2 M NaOH with 2L of 0.5M NaoH is
a) 0.9 M b) 0.3M
c) 1.8M d) 0.18 M
13)Conc HNO3 is 70% by mass. How many 13)Conc HNO3 is 70% by mass. How many gms of conc HNO3 should be used to prepare 250mL of 2M HNO3 ?p epa e 50 o O3 ?
)45 b) 90 ) 70 d) 54a)45g b) 90g c) 70g d) 54g
Molarity = = × ××
22 2
2L
L
Wor W M olarity M V
M V2 L
= × × =2 63 0 25 31 5g= × × =2 63 0.25 31.5g100
315 45M f HNO = × =3 31.5 4570
Mass of HNO g
ANS : (a)
14) 5 ml of acetone is mixed with 100ml of H O The vapour pressure of waterof H2O. The vapour pressure of waterabove the solution is
a)equal to the V.P. of pure water) f b)equal to the V.P. of solution
c) less than the V.P. of pure waterd) h h f Od)More than the V.P. of pure H2O
15) At a given temp, the vapour pressures of two liquids A and B are 120 p qand 180 mm of Hg respectively. The V.P. of the ideal solution containing 2 moles of gA and 3 moles of B will bea)156mm b) 145mma)156mm b) 145mm
c) 150mm d) 108mmc) 150mm d) 108mm
= +0 0A A B BP X P X PA A B B
⎛ ⎞ ⎛ ⎞= × + × =⎜ ⎟ ⎜ ⎟⎝ ⎠ ⎝ ⎠
2 31 2 0 1 8 0 1 5 6
5 5m m
⎝ ⎠ ⎝ ⎠5 5
ANS ( )ANS : ( a )
16) Negative deviation from Raoult’s law isobserved in which of the following binaryliquid mixtures ?
a) Ethanol & acetonea) Ethanol & acetoneb) Benzene & Toluenec) Chloro Ethane & Bromo Ethanec) Chloro Ethane & Bromo Ethaned) Acetone and Chloroform
17)18g of glucose is added to 178.2 g of 17)18g of glucose is added to 178.2 g of water. The vapour pressure of water forthis solution at 1000C isthis solution at 100 C is
a)76 Torr b) 752 4 Torra)76 Torr b) 752.4 Torr
c) 759 Torr d) 7 6 Torrc) 759 Torr d) 7.6 Torr
18g of Glucose = =1 8
0 . 11 8 0
m o l e
178.2g of water = =1 7 8 . 2
9 . 91 8
m o l e s
− −∴ = ⇒ =
0
0
0 .1 7600 .01
10 760P P P
P
∴ = − =7 6 0 7 . 6 7 5 2 . 4P
ANS : b
18.The osmotic pressure of a solution8. e os ot c p essu e o a so ut oat 00C is 4 atmos.The osmotic pressureat 546 K is
a) 4atm b) 2atmc) 8atm d) 1atm
19) An aqueous solution of KI is 1 molal.Which of the following will cause gthe vapour pressure of the solution toincrease?
a)Addition of waterb)Addition of NaClb)Addition of NaClc) Addition of Na2SO4d)Addition of Kl solutiond)Addition of Kl solution
20) Th ti f 20) The average osmotic pressure of human blood is 7.8 bar at 370C. What is th C n f N Cl th t ld b i j t d the Concn of NaCl that could be injected into the blood ?
)0 15M b) 0 30Ma)0.15M b) 0.30M
) 0 60M d) 0 45Mc) 0.60M d) 0.45M
21) A solution of urea boils at 100.180C at1 atmos. If Kf and Kb for water are 1.86 f band 0.52 K kg Mol-1 respectively, theabove solution will freeze at
a)-6.540C b) -0.6540C
c) 6.540C d) 0.6540C
22 Solutions A B C and D are espectively 22.Solutions A, B, C and D are espectively 0.1M Glucose, 0.05M NaCl, 0.05M BaCl2 and 0 1M AlCl3 Which one of the BaCl2 and 0.1M AlCl3. Which one of the following pairs is isotonic ?
a)A & B b) B & C
c) A & D d) A & C
23) 0.1M NaCl and 0.05M BaCl2 are separated by S P M which of the separated by S.P.M. which of the following is true ?
a) No movement across the membraneb) Water flows into NaCl solutionb) Wate ows to aC so ut oc) Water flows into BaCl2 solu tiond) Osmotic Pressure of 0.1M NaCl is) Os ot c ess e o 0. aC s
lower than that of BaCl2
24) If two liquids A and B have Then the molefraction of A in Vapours is
0 0: 1:2A BP P =
Then the molefraction of A in Vapours is(M.F’s of A & B are in the ratio of 1:2)
a)0.33 b) 0.25
c) 0.52 d) 0.2