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NEET Chemistry MCQ
Solutions And Liquid States Mcq Neet Chemistry
Quiz 4
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Q.1
At the same temperature which of the following solutions will be isotonic? [ MP PMT 1985]
0%
a) 3.42g of sucrose per litre of water and 0.18g glucose per litre of water
0%
b) 3.42g of sucrose per litre and 0.18g glucose in 0.1 litre of water
0%
c) 3.42g of sucrose per litre of water and 0.585g of sodium chloride per litre of water
0%
d) 3.42g of sucrose per litre of water and 1.17g of sodium chloride per litre of water
Explanation
3.42g of sucrose per litre=0.1M 0.18g glucose in 0.1 litre of water=0.1 Mand both do not gives ions in water hence osmotic pressure is sameAnswer: (b)
Q.2
The molal elevation constant is the ratio of the elevation in B.P. to ... [ CPMT 1982]
0%
a) Molarity
0%
b) Molality
0%
c) Mole fraction of solute
0%
d) Mole fraction of solvent
Explanation
ΔT=Kb × mole fraction (m) Answer: (b)
Q.3
A molal solution is one that contains one mole of a solute in .. [ IIT 1986]
0%
a) 1000g of solvent
0%
b) one litre of solvent
0%
c) one litre of the solution
0%
d) 22.4 litre of the solution
Explanation
Answer: (a)
Q.4
At constant temperature, the osmotic pressure of a solution is ... [ CPMT 1986]
0%
a) directly proportional to the concentration
0%
b) inversely proportional to the concentration
0%
c) directly proportional to the square of the concentration
0%
d) directly proportional to the square root of the concentration
Explanation
Answer: (a)
Q.5
Van't Hoff factor more than unity indicates that the solute in solution has ... [ DEC 1994]
0%
a) dissociated
0%
b) associated
0%
c) both
0%
d) can not say anything
Explanation
Van't Hoff factor is more than 1 for the strong electrolytes which will dissociate and forms more than one ion. Answer: (a)
Q.6
Vapour pressure of solution is ... [ EAMCET 1988]
0%
a) directly proportional to the mole fraction of the solvent.
0%
b) inversely proportional to mole fractional of the solute
0%
c) inversely proportional to the mole fraction of the solvent
0%
d) directly proportional to the mole fraction of solute
Explanation
Answer: (a)
Q.7
The solubility f gas increases in a liquid with .. [ Pb. CET 1990]
0%
a) increase of temperature
0%
b) reduction of gas pressure
0%
c) decrease in temperature
0%
d) amount of liquid taken
Explanation
Answer: (c)
Q.8
A non-volatile electrolyte dissolved in an aqueous solution in the same molal proportion as a non electrolyte gives .. [ Pb CET 1991]
0%
a) the same colligative effect
0%
b) higher colligative effect
0%
c) lower colligative effect
0%
d) no colligative effect
Explanation
Answer: (b)
Q.9
At low concentration, the statement that equimolal solution under a given set of experimental conditions have equal osmotic pressure is true for .. [ BHU 1979]
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a) All solutions
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b) Solutions of non-electrolytes only
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c) Solutions of electrolytes only
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d) None of these
Explanation
non-electrolytes do not dissociates Answer: (b)
Q.10
When mercuric iodide is added to the aqueous solution of potassium iodide, the ... [ IIT 1987]
0%
a) freezing point is raised
0%
b) freezing point is lowered
0%
c) freezing point does not change
0%
d) boiling point does not change
Explanation
2KI + HgI2 → K2HgI4 As a result of this reaction, number of ions decrease. So the lowering in freezing point is less or the actual freezing point is moreAnswer: (a)
Q.11
Which of the following is a colligative property? [ BHU 1990]
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a) surface tension
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b) viscosity
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c) osmotic pressure
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d) boiling point
Explanation
Answer: (c)
Q.12
Which of the following would exert maximum osmotic pressure? [ NCERT 1982]
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a) Decinormal aluminium sulphate
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b) Decinormal barium chloride
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c) Decinormal sodium chloride
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d) A solution obtained by mixing equal volumes of (b) and (c) and filtering
Explanation
Al2SO4 gives max. ions. Hence its osmotic pressure is maximum. Answer: (a)
Q.13
The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows... [ IIT 1981]
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a) negative deviation from Raoult's law
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b) positive deviations from Raoult's law
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c) no deviations from Raoul's law
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d) deviations which cannot be predicted from given information.
Explanation
Boiling point of azeotropic mixture is less when it shows positive deviations Answer: (b)
Q.14
Blood cells retains their normal shape in solution which are ... [ DPMT 1984]
0%
a) hypotonic to blood
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b) isotonic to blood
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c) hypertonic to blood
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d) equinormal to blood
Explanation
Answer: (b)
Q.15
Which inorganic precipitate acts as a semipermeable membrane? [ MP PMT 1993]
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a) Calcium phosphate
0%
b) Nickel phosphate
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c) Calcium sulphate
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d) Copper ferrocyanide
Explanation
Answer: (d)
Q.16
The best and accurate method for determining osmotic pressure is ... [ JIPMER 91]
0%
a) Negative pressure method
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b) Berkeley and Hartley method
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c)
0%
d)
Explanation
Answer: (b)
Q.17
An ideal solution is formed when its components... [ DPMT 1994]
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a) have no volume change on mixing
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b) have no enthalpy change on mixing
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c) have both the above characteristics
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d) have high solubility
Explanation
Answer: (c)
Q.18
In cold countries, ethylene glycol is added to water in the radiators of cars during winters. This results in ... [ AFMC 1994]
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a) lowering of freezing point
0%
b) reducing the viscosity
0%
c) reducing the specific heat
0%
d) making water a better conductor of electricity
Explanation
Answer: (a)
Q.19
Which of the following aqueous solution has minimum freezing point? [ CBSE PMT 1991]
0%
a) 0.01 m NaCl
0%
b) 0.005 m C2H5OH
0%
c) 0.005 m MgI2
0%
d) 0.005 m MgSO4
Explanation
Difference in electronegativity
Type of bond
<0.4
Non-polar covalent
0.4-1.7
polar covalent;
> 1.7
ionic
Now Electronegativity of I = 2.66 while Mg = 1.31, difference in electronegativity is 1.35 which is between 0.4-1.7 hence bonding is plar covalent MgI2 when dissolved in water may not disassociate completely , hence MgI2 is not correct Answer: (a)
Q.20
If 0.1M solution of glucose and 0.1M solution of urea are placed on two sides of the semipermeable membrane to equal heights, then it will be correct to say that ....[ CBSE PMT1992]
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a) there will be no net movement across the membrane
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b) glucose will flow towards urea solution
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c) urea will flow towards glucose solution
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d) water will flow from urea solution to glucose solution
Explanation
both the solutions are isotonic Answer: (a)
Q.21
Azeotropes are .. [ NCERT 1980]
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a) liquid mixture which distil unchanged in composition
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b) liquid which can mix with each other in all proportions
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c) solids which form solid solutions of definite composition
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d) gas which can be separated
Explanation
Answer: (a)
Q.22
Molecular weight of sodium chloride determined by osmotic pressure method will be .. [ Haryana CEET 1992]
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a) equal to 58.5
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b) greater than 58.5
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c) less than 58.5
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d) none of the above as this method can not be used for molecular weight determination
Explanation
NaCl dissociates into ions. As the number of particles increases, the value of colligative property is more and so mol.mass is less Answer: (c)
Q.23
A 0.6% solution of urea ( molecular weight=60) would be isotonic with.. [ NCERT 1982]
0%
a) 0.1M glucose
0%
b) 0.1 M KCl
0%
c) 0.6% glucose solution
0%
d) 0.6% KCl solution
Explanation
0.6% urea solution contains 6 grams urea in litre=0.1 mole in litre or solution is 0.1M also urea do not dissociateSolution of glucose molarity is 0.1 and glucose do not dissociateAnswer: (a)
Q.24
semipermiable membrane is that which permits the passage of ... [ MP PET 1994]
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a) Solute molecules only
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b) Solvent molecules only
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c) Solute and Solvent molecules both
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d) Neither solute nor solvent molecules
Explanation
Answer: (b)
Q.25
The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water is .. [ CPMT 1985] kf=1.8g
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a) - 1.86°C
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b) - 3.72°C
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c) + 1.86°C
0%
d) + 3.72°C
Explanation
ΔTf=i×Kf×m ΔTf=2×1.86×1=3.72°Answer: (b)
Q.26
The osmotic pressure of a solution increases if... [ AFMC 1993]
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a) temperature is decreased
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b) solution constant is increased
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c) number of solute particles is increased
0%
d) volume is increased
Explanation
Answer: (c)
Q.27
All form ideal solution except .. [ CBSE PMT 1988]
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a) C6H6 and C6H5Br
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b) C2H5Br and C2H5I
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c) C6H5Cl and C6H5Br
0%
d) C2H5I and C2H5OH
Explanation
C2H5I and C2H5OH are dissimilar liquids Answer: (d)
Q.28
Sugar is soluble in water due to .. [ Pb CET 1989]
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a) High solvation energy
0%
b) Ionic character of sugar
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c) High dipole moment of water
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d) Hydrogen bond formation with water
Explanation
Answer: (d)
Q.29
Acetic acid dissolved in benzene shows a molecular mass of .. [ MP PMT 1993]
0%
a) 30
0%
b) 60
0%
c) 120
0%
d) 180
Explanation
Acetic acid in benzene dimerizes to form (CH3COOH)2 Answer: (a)
Q.30
Which of the following liquid pairs shows a positive deviation from Raoult's law
0%
a) Water-hydrochloric acid
0%
b) Water nitric acid
0%
c) Acetone chloroform
0%
d) Benzene-methanol
Explanation
Benzene cuts off Methanol hydrogen bonding Answer: (d)
0 h : 0 m : 1 s
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