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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The osmotic pressure of a 5% solution of can sugar (molecular mass 342) at `15^(@)C` is :A. 3.46 atmB. 3.64 atmC. 4.0 atmD. 2.45 atm |
| Answer» Correct Answer - A | |
| 52. |
The osmotic pressure of a solution of benzoic acid dissolved in benzene is less than expected because:A. benzoic acid is organic soluteB. benzoic acid has higher molar mass than benzeneC. benzoic acid gets associated in benzeneD. benzoic acid gets dissociated in benzene |
| Answer» Correct Answer - C | |
| 53. |
The osmotic pressure of solution increases if :A. increasing the temperature of the solutionB. decreasing the temperature of the solutionC. increasing the volume of the vesselD. diluting the solution |
| Answer» Correct Answer - A | |
| 54. |
The molal b.pt constant for water is `0.513^(@)C "kg mol"^(-1)`. When 0.1 mole of sugar is dissolved in 200g of water, the solution boils under a pressure of 1 atm at :A. `100.513^(@)C`B. `100.0513^(@)C`C. `100.256^(@)C`D. `101.025^(@)C` |
| Answer» Correct Answer - C | |
| 55. |
The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to :A. ionisation of benzoic acidB. dimerization of benzoic acidC. trimerization of benzoic acidD. solvation of benzoic acid |
| Answer» Correct Answer - B | |
| 56. |
Osmotic pressure of a urea solution at `10^(@)C` is 500 mm. Osmotic pressure of the solution become 105.3 mm. When it is diluted and temperature raised to `25^(@)C`.The extent of dilution isA. 8 timesB. 5 timesC. 4 timesD. 7 times |
| Answer» Correct Answer - B | |
| 57. |
The average osmotic pressure of human blood is `7.8` bar at `37^(@)C`. What is the concentration of an aqueous`NaCl`solution that could be used in the blood stream ?A. 0.15 mol/LB. 0.30 mol/LC. 0.45 mol/LD. 0.60 mol/L |
| Answer» Correct Answer - B | |
| 58. |
The osmotic pressure of a solution of benzoic acid dissolved in benzene is less than expected because:A. benzoic acid is an organic soluteB. benzoic acid has higher molar mass than benzeneC. benzoic acid gets associated in benzeneD. benzoic acid gets dissociated in benzene |
| Answer» Correct Answer - C | |
| 59. |
Blood cells do not shrink in blood because blood is :A. hypertonicB. isotonicC. equimolarD. hypotonic |
| Answer» Correct Answer - B | |
| 60. |
The solution which boil at constant temperature like a pure liquid and possess same composition in liquid as well as vapour state are called azeotropes. The components of azetropes cannot be separated by fractional distillation. Only non-ideal solutions form azeotropes. Solutions with negative deviation form maximum boiling azeotrope and the solutions with positive deviation form minimum boiling azeotrope. The boiling point of an azeotrope is never equal to the boiling points of any of the components of the azeotrope. Answer the following question: The azeotropic solutions of two miscible liquids Which among the following combinations is a maximum boiling azeotrope?A. `H_(2)O+CH_(3)OH`B. `C Cl_(4)+CHCl_(3)`C. `(CH_(3))_(2)CO+C_(2)H_(5)OH`D. `H_(2)O+HNO_(3)` |
| Answer» Correct Answer - D | |
| 61. |
Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-to-day life. One of its examples is the use of ethylene glycol and water mixture as anti-freezing liquid in the radiator of automobiles. A solution `M` is prepared by mixing ethanol and water. Thus moel fraction of ethanol in the mixture is `0.9`. Given: Freezing point depression constant of water `(K_(f)^("water")) = 1.86 K kg mol^(-1)` Freezing point depression constant of ethanol `(K_(f)^("ethanol")) = 2.0 K kg mol^(-1)` Boiling point elevation constant of water `(K_(b)^("water")) = 0.52 K kg mol^(-1)` Boiling point elevation constant of ethanol `(K_(b)^("ethanol")) = 1.2 K kg mol^(-1)` Standard freezing point of water `= 273 K` Standard freezing point of ethanol `= 155.7K` Standard boiling point of water `= 373 K` Standard boiling point of ethanol `= 351.5 K` vapour pressure of pure water `= 32.8 mm Hg` Vapour pressure of pure ethanol `= 40 mm Hg` Molecualr weight of water `= 18 g mol^(-1)` Molecular weight of ethanol `= 46 g mol^(-1)` In asweering the following questions, consider the solutions to be ideal dilute solutions and solutes to be non-volatile and non-dissociative. The vapour pressure of the solution `M` is:A. 39.3 mm HgB. 36.0 mm HgC. 29.5 mm HgD. 28.8 mm Hg |
| Answer» Correct Answer - B | |
| 62. |
Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-to-day life. One of its examples is the use of ethylene glycol and water mixture as anti-freezing liquid in the radiator of automobiles. A solution `M` is prepared by mixing ethanol and water. Thus moel fraction of ethanol in the mixture is `0.9`. Given: Freezing point depression constant of water `(K_(f)^("water")) = 1.86 K kg mol^(-1)` Freezing point depression constant of ethanol `(K_(f)^("ethanol")) = 2.0 K kg mol^(-1)` Boiling point elevation constant of water `(K_(b)^("water")) = 0.52 K kg mol^(-1)` Boiling point elevation constant of ethanol `(K_(b)^("ethanol")) = 1.2 K kg mol^(-1)` Standard freezing point of water `= 273 K` Standard freezing point of ethanol `= 155.7K` Standard boiling point of water `= 373 K` Standard boiling point of ethanol `= 351.5 K` vapour pressure of pure water `= 32.8 mm Hg` Vapour pressure of pure ethanol `= 40 mm Hg` Molecualr weight of water `= 18 g mol^(-1)` Molecular weight of ethanol `= 46 g mol^(-1)` In asweering the following questions, consider the solutions to be ideal dilute solutions and solutes to be non-volatile and non-dissociative. The freezing point of the solution `M` is :A. 268.7 KB. 268.5 KC. 234.2 KD. 150.9 K |
| Answer» Correct Answer - D | |
| 63. |
The vapour pressure of water at room temperature is 30 mm of Hg. If the mole fraction of the water is 0.9, the vapour pressure of the solution will be :A. 30 mm of HgB. 24 mm of HgC. 21 mm of HgD. 27 mm of Hg |
| Answer» Correct Answer - D | |
| 64. |
For a non-volatile soluteA. vapour pressure of solute is zeroB. vapour pressure of solution = vapour pressure of pure solventC. vapour pressure of solution = vapour pressure of solvent in solutionD. all of the above |
| Answer» Correct Answer - A::C | |
| 65. |
One mole of non-volatile solute is dissolved in two mole of water. The vapour pressure of the solution relative to that of water is:A. `2//3`B. `1//3`C. `3//2`D. `1//2` |
| Answer» Correct Answer - A | |
| 66. |
If `P_(A)` is the vapour pressure of a pure liquid A and the mole fraction of A in the mixture of two liquids A and B is x, the parial vapour pressure of A is:A. `(1 -x)P_(A)`B. `xP_(A)`C. `(x)/((1 - x)) P_(A)`D. `(1 - x)/(x) P_(A)` |
| Answer» Correct Answer - B | |
| 67. |
An antifreeze solution is prepared for a laboratory experiment. In this solution 222.6g of ethylene glycol is dissolved in 200g of water. The density of resultant solution was found to be `1.072 "g mL"^(-1)`. Molal depression constant of water is `"1.86 K kg mol"^(-1)` and molar mass of ethylene glycol `(C_(2)H_(6)O_(2))` is `"62 g mol"^(-1)`. Molarity of solution is :A. 0.911B. 9.11C. 17.95D. 1.795 |
| Answer» Correct Answer - B | |
| 68. |
The elevation in boiling point of a solution of 10g of a binary electrolyte (molecular mass 100) in 100g of water is `DeltaT_(b)`. The value of `K_(b)` for water is :A. `(Delta T_(b))/(2)`B. 10C. `10 Delta T_(b)`D. `(Delta T_(b))/(10)` |
| Answer» Correct Answer - A | |
| 69. |
An antifreeze solution is prepared for a laboratory experiment. In this solution 222.6g of ethylene glycol is dissolved in 200g of water. The density of resultant solution was found to be `1.072 "g mL"^(-1)`. Molal depression constant of water is `"1.86 K kg mol"^(-1)` and molar mass of ethylene glycol `(C_(2)H_(6)O_(2))` is `"62 g mol"^(-1)`. Freezing point of the solution will be :A. `-17.387^(@)C`B. `-33.387^(@)C`C. `-3.38^(@)C`D. `-0.338^(@)C` |
| Answer» Correct Answer - B | |
| 70. |
Elevation in boiling point was `0.52^(@)C` when 6 g of a compound X was dissolved in 100 g of water. Molecular weight of X is (`K_(b)` of water is `5.2^(@)C` per 100 g of water)A. 120B. 60C. 600D. 180 |
| Answer» Correct Answer - B | |
| 71. |
An antifreeze solution is prepared for a laboratory experiment. In this solution 222.6g of ethylene glycol is dissolved in 200g of water. The density of resultant solution was found to be `1.072 "g mL"^(-1)`. Molal depression constant of water is `"1.86 K kg mol"^(-1)` and molar mass of ethylene glycol `(C_(2)H_(6)O_(2))` is `"62 g mol"^(-1)`. Molality of solution is :A. 17.95B. 0.1795C. 1.795D. 5.197 |
| Answer» Correct Answer - A | |
| 72. |
The following is a graph plotted between the vapour pressure of two volatile liquids against their respective mole fractions. Which of the following statements is/are correct? A. When `x_(A)=1 and x_(B)=0`, then `p= p_(A)^(0)`B. When `x_(B)=1 and x_(A)=0`, then `p= p_(B)^(0)`C. When `x_(A)=1 and x_(B)=0`, then `p lt p_(B)^(0)`D. When `x_(B)=1 and x_(A)=0`, then `p gt p_(A)^(0)` |
| Answer» Correct Answer - A::B | |
| 73. |
Osmotic pressure of a solution is :A. directly proportional to the molar concentration of the solutionB. inversely proportional to the molecular weight of the soluteC. inversely proportional to the temperatureD. directly proportional to the volume of the solution |
| Answer» Correct Answer - A::D | |
| 74. |
If glycerol and methanol were sold at the same price in the market, which would be cheaper for perparing an antifreeze solution for the radiator of an automobile ?A. GlycerolB. MethanolC. Both are equalD. None of these |
| Answer» Correct Answer - B | |
| 75. |
For `[CrCl_(3).xNH_(3)]`, elevation in boiling point of one molal solution is double of one molal solution of glucose , hence `x` is if complex is 100% ionised :A. 4B. 5C. 6D. 3 |
| Answer» Correct Answer - A | |
| 76. |
The molal elevation of an unknown solution is equal to the molal elevation of 0.1 M solution of urea. The concentration of unknown solution is :A. 1MB. 0.01 MC. 0.1 MD. none of these |
| Answer» Correct Answer - C | |
| 77. |
The molal elevation constant is the ratio of the elevation in boiling point to :A. molarityB. molalityC. mole fraction of soluteD. mole fraction of solvent |
| Answer» Correct Answer - B | |
| 78. |
Which has minimum osmotic pressure ?A. 200 mL of 2 M NaCl solutionB. 200 mL of 1 M glucose solutionC. 200 mL of 2 M urea solutionD. All have same |
| Answer» Correct Answer - B | |
| 79. |
If for the sucrose solution elevation in boiling point is `0.1^(@)C`then what will be the boiling point of NaCl solution for same molal concentrationA. `0.1^(@)C`B. `0.2^(@)C`C. `0.08^(@)C`D. `0.01^(@)C` |
| Answer» Correct Answer - B | |
| 80. |
Calculate the molal depression constant of a solvent which has a. Freezing point `16.6^(@)C` and latent heat of fusion `180.75 J g^(-1)` . b. Freezing point `20.0^(@)C` and latent heat of fusion `200.00 J g^(-1)`.A. 2.68B. 3.86C. 4.68D. 2.86 |
| Answer» Correct Answer - B | |
| 81. |
The best colligative property used for the determination of molecular mases of polymers is :A. relative lowering in vapour pressureB. osmotic pressureC. elevation in boiling pointD. depression in freezing point |
| Answer» Correct Answer - B | |
| 82. |
A maxima or minima obtained in the temperature composition curve of a mixture of two liquids indicates:A. an azetropic mixtureB. an eutectic formationC. that the liquids are immiscible with on anotherD. that the liquids are partially miscible at the maximum or minimum |
| Answer» Correct Answer - A | |
| 83. |
If liquids A and B from an ideal solutionA. the free energy of mixing is zeroB. the free energy as well as entropy of mixing are zeroC. enthalpy of mixing is zeroD. the entropy of mixing is zero |
| Answer» Correct Answer - C | |
| 84. |
Ideal solution is formed when its components :A. have zero heat of mixing onlyB. have zero volume change on mixing onlyC. have zero heat of mixing and zero volume changeD. can be converted into gases |
| Answer» Correct Answer - C | |
| 85. |
The solubility of a substance is defined as the amount of solute in grams :A. present in 100g of the solventB. present in 100g of the solutionC. present in 100 mL of the solutionD. present in 1 litre of the solution |
| Answer» Correct Answer - A | |
| 86. |
The osomotic pressure `pi` depends on the molar concentration of the solution `(pi=CRT)`. If two solutions are of equal solute concentration and, hence, have the same omotic pressure, they are said to be isotonic. If two solutions are of unequal osmotic pressures, the more concentrated solution is said to be hypertonic and the more diluted solution is described as hypotonic. Osmosis is the major mechanism for transporting water upward in the plants. Answer the following questions: What would be the percent strength of solution of urea that would be isotonic with `4.5%` solution of glucose?A. `4.5 %`B. `13.5 %`C. `1.5 %`D. `9 %` |
| Answer» Correct Answer - C | |
| 87. |
A solution is defined as a :A. homogeneous mixture of two or more substancesB. heterogeneous mixture of two or more substancesC. homogeneous mixture of liquid and soild components onlyD. homogeneous mixture consisting of water as one of the components |
| Answer» Correct Answer - A | |
| 88. |
Assertion (A): Water boiling at `100^(@)C` at `1` atmospheric pressure in a beaker is not at equilibrium. Reason (R ): If refers to an open system.A. If both (A) and (R) are correct and (R) is the correct explanation for (A)B. If both (A) and (R) are correct but (R) is not correct explanation for (A)C. If (A) is correct but (R) is incorrectD. If (A) is incorrect but (R) is correct |
| Answer» Correct Answer - A | |
| 89. |
Molar solution means 1 mole of solute present inA. 1000g of solventB. 1 litre of solventC. 1 litre of solutionD. 1000g of solution |
| Answer» Correct Answer - C | |
| 90. |
(A) : A solution which contains one gram equivalent of solute pre litre of the solution is called a normal solution (R) : A normal solution means a solution in which the solute does not associate or dissociate.A. If both (A) and (R) are correct and (R) is the correct explanation for (A)B. If both (A) and (R) are correct but (R) is not correct explanation for (A)C. If (A) is correct but (R) is incorrectD. If (A) is incorrect but (R) is correct |
| Answer» Correct Answer - C | |
| 91. |
Compartment `A` and `B` have the following combinations of solution: `{:(,A,B),(1,0.1 M KCl,0.2 M KCl),(2,0.1%(m//V) NaCl,10% (m//V) NaCl),(3,18 gL^(-1) "glucose",34.2 gL^(-1) "sucrose"),(3,20% (m//V) "glucose",10% (m//V) "glucose"):}` Indicate the solution(s) in which compartment `B` will show an increases in volume.A. 1,2,4B. 1,2C. 2,3D. 3,4 |
| Answer» Correct Answer - B | |
| 92. |
Compartment `A` and `B` have the following combinations of solution: `{:(,A,B),(1,0.1 M KCl,0.2 M KCl),(2,0.1%(m//V) NaCl,10% (m//V) NaCl),(3,18 gL^(-1) "glucose",34.2 gL^(-1) "sucrose"),(3,20% (m//V) "glucose",10% (m//V) "glucose"):}` The solution in which there will be no change in the level of the solution in the compartment `A` and `B` is.A. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - C | |
| 93. |
Compartment `A` and `B` have the following combinations of solution: `{:(,A,B),(1,0.1 M KCl,0.2 M KCl),(2,0.1%(m//V) NaCl,10% (m//V) NaCl),(3,18 gL^(-1) "glucose",34.2 gL^(-1) "sucrose"),(3,20% (m//V) "glucose",10% (m//V) "glucose"):}` Indicate the solution(s) in which compartment `B` will show an increases in volume.A. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - D | |
| 94. |
Compartment `A` and `B` have the following combinations of solution: `{:(,A,B),(1,0.1 M KCl,0.2 M KCl),(2,0.1%(m//V) NaCl,10% (m//V) NaCl),(3,18 gL^(-1) "glucose",34.2 gL^(-1) "sucrose"),(3,20% (m//V) "glucose",10% (m//V) "glucose"):}` The solutions in which compartment `B` is hypertonic.A. 1 onlyB. 3 onlyC. 4 onlyD. 2 only |
| Answer» Correct Answer - B | |
| 95. |
Compartment `A` and `B` have the following combinations of solution: `{:(,A,B),(1,0.1 M KCl,0.2 M KCl),(2,0.1%(m//V) NaCl,10% (m//V) NaCl),(3,18 gL^(-1) "glucose",34.2 gL^(-1) "sucrose"),(3,20% (m//V) "glucose",10% (m//V) "glucose"):}` The solutions in which compartment `B` is hypertonic.A. 1,2B. 2,3C. 3,4D. 1,4 |
| Answer» Correct Answer - A | |
| 96. |
Saturated solution of NaCl on heating becomes :A. supersaturatedB. unsaturatedC. remains saturatedD. none of these |
| Answer» Correct Answer - B | |
| 97. |
When a crystal of a solute is introduced into a supersaturated solution of the solute :A. the solute dissolvesB. the solution becomes unsaturatedC. the solution remains supersaturatedD. the excess of solute crystallises out |
| Answer» Correct Answer - D | |
| 98. |
A supersaturates solution is a metastable state of solution in which solute concentration:A. is equal to the solubility of the substance in solventB. is less than the solubilityC. exceeds the solubilityD. continuously changes |
| Answer» Correct Answer - C | |
| 99. |
A molal solution is one that contains one mole of a solute inA. 1000 g of the solventB. one litre of the solutionC. one litre of the solventD. 22.4 litre of the solution |
| Answer» Correct Answer - A | |
| 100. |
Which is a dimensionless quantity ?A. Mole fractionB. MolalityC. % by wt. of solventD. % by wt of solution |
| Answer» Correct Answer - A::C::D | |