MCQOPTIONS
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MCQOPTIONS
This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Unit of molarity is known as |
| A. | Mol lit |
| B. | Mole kg |
| C. | Gram equiv. lit |
| D. | None of these |
| Answer» B. Mole kg | |
| 2. |
Which one is the heaviest ? |
| A. | 25 g Hg |
| B. | 2 moles of H |
| C. | O |
| D. | 2 moles of CO |
| E. | 4 g-atoms of O |
| Answer» D. 2 moles of CO | |
| 3. |
On adding solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is [UPSEAT 2003] |
| A. | 0.25 |
| B. | 0.75 |
| C. | 0.5 |
| D. | 0.33 |
| Answer» B. 0.75 | |
| 4. |
Elevation in boiling point was \[{{0.52}^{o}}C\] when \[6\,gm\] of a compound \[X\] was dissolved in \[100\,gm\] of water. Molecular weight of \[X\] is \[({{K}_{b}}\] for water is 0.52 per 1000 gm of water) [CPMT 1989] |
| A. | 120 |
| B. | 60 |
| C. | 180 |
| D. | 600 |
| Answer» C. 180 | |
| 5. |
The rise in the boiling point of a solution containing 1.8 gram of glucose in \[100g\] of a solvent in \[{{0.1}^{o}}C\]. The molal elevation constant of the liquid is[CPMT 1999] |
| A. | 0.01 \[K/m\] |
| B. | \[0.1\,K/m\] |
| C. | \[1\,K/m\] |
| D. | \[10\,K/m\] |
| Answer» D. \[10\,K/m\] | |
| 6. |
Mark the correct relationship between the boiling points of very dilute solutions of \[BaC{{l}_{2}}\,({{t}_{1}})\] and \[KCl\,({{t}_{2}})\], having the same molarity[CPMT 1984, 93] |
| A. | \[{{t}_{1}}={{t}_{2}}\] |
| B. | \[{{t}_{1}}>{{t}_{2}}\] |
| C. | \[{{t}_{2}}>{{t}_{1}}\] |
| D. | \[{{t}_{2}}\] is approximately equal to \[{{t}_{1}}\] |
| Answer» C. \[{{t}_{2}}>{{t}_{1}}\] | |
| 7. |
The elevation in boiling point of a solution of 13.44g of CuCl2 in 1kg of water using the following information will be (Molecular weight of CuCl2 = 134.4 and Kb = 0.52 K molal-1) [IIT 2005] |
| A. | 0.16 |
| B. | 0.05 |
| C. | 0.1 |
| D. | 0.2 |
| Answer» B. 0.05 | |
| 8. |
If for a sucrose solution elevation in boiling point is 0.1°C then what will be the boiling point of NaCl solution for same molal concentration[BHU 1998, 2005] |
| A. | \[0.1{}^\circ C\] |
| B. | \[0.2{}^\circ C\] |
| C. | \[0.08{}^\circ C\] |
| D. | \[0.01{}^\circ C\] |
| Answer» C. \[0.08{}^\circ C\] | |
| 9. |
The freezing point of a solution prepared from \[1.25\,gm\] of a non-electrolyte and \[20\,gm\] of water is \[271.9\,K\]. If molar depression constant is \[1.86K\,mol{{e}^{-1}}\], then molar mass of the solute will be[AFMC 1998; CPMT 1999] |
| A. | 105.7 |
| B. | 106.7 |
| C. | 115.3 |
| D. | 93.9 |
| Answer» B. 106.7 | |
| 10. |
In the depression of freezing point experiment, it is found that the [IIT 1999] |
| A. | Vapour pressure of the solution is less than that of pure solvent |
| B. | Vapour pressure of the solution is more than that of pure solvent |
| C. | Only solute molecules solidify at the freezing point |
| D. | Only solvent molecules solidify at the freezing point |
| Answer» B. Vapour pressure of the solution is more than that of pure solvent | |
| 11. |
0.440 g of a substance dissolved in 22.2 g of benzene lowered the freezing point of benzene by \[{{0.567}^{o}}C\]. The molecular mass of the substance \[({{K}_{f}}={{5.12}^{o}}C\,mo{{l}^{-1}})\] [BHU 2001; CPMT 2001] |
| A. | 178.9 |
| B. | 177.8 |
| C. | 176.7 |
| D. | 175.6 |
| Answer» B. 177.8 | |
| 12. |
What is the effect of the addition of sugar on the boiling and freezing points of water [Kerala CET (Med.) 2003] |
| A. | Both boiling point and freezing point increases |
| B. | Both boiling point and freezing point decreases |
| C. | Boiling point increases and freezing point decreases |
| D. | Boiling point decreases and freezing point increases |
| Answer» D. Boiling point decreases and freezing point increases | |
| 13. |
The freezing point of one molal \[NaCl\] solution assuming \[NaCl\]to be 100% dissociated in water is (molal depression constant = 1.86) [CPMT 1985; BHU 1981; MP PMT 1997; UPSEAT 2001] |
| A. | \[-{{1.86}^{o}}C\] |
| B. | \[-{{3.72}^{o}}C\] |
| C. | \[+{{1.86}^{o}}C\] |
| D. | \[+{{3.72}^{o}}C\] |
| Answer» C. \[+{{1.86}^{o}}C\] | |
| 14. |
A solution containing 30 gms of non-volatile solute in exactly 90 gm water has a vapour pressure of 21.85 mm Hg at \[{{25}^{o}}C\]. Further 18 gms of water is then added to the solution. The resulting solution has a vapour pressure of 22.15 mm Hg at \[{{25}^{o}}C\]. Calculate the molecular weight of the solute [UPSEAT 2001] |
| A. | 74.2 |
| B. | 75.6 |
| C. | 67.83 |
| D. | 78.7 |
| Answer» D. 78.7 | |
| 15. |
Which of the following is not a colligative property [BHU 1982; CPMT 1988; DPMT 1985; MP PET 1999] |
| A. | Osmotic pressure |
| B. | Elevation in B.P. |
| C. | Vapour pressure |
| D. | Depression in freezing point |
| Answer» D. Depression in freezing point | |
| 16. |
Colligative properties are used for the determination of [Kerala CET (Engg.) 2002] |
| A. | Molar Mass |
| B. | Equivalent weight |
| C. | Arrangement of molecules |
| D. | Melting point and boiling point |
| E. | Both A and B |
| Answer» B. Equivalent weight | |
| 17. |
Which one has the highest osmotic pressure [CBSE PMT 1991; DPMT 1991; MP PET 1994] |
| A. | \[M/10\,HCl\] |
| B. | \[M/10\] urea |
| C. | \[M/10\,BaC{{l}_{2}}\] |
| D. | \[M/10\] glucose |
| Answer» D. \[M/10\] glucose | |
| 18. |
Which has the minimum freezing point[CPMT 1991] |
| A. | One molal \[NaCl\] solution |
| B. | One molal \[KCl\] solution |
| C. | One molal \[CaC{{l}_{2}}\] solution |
| D. | One molal urea solution |
| Answer» D. One molal urea solution | |
| 19. |
A mixture of two completely miscible non-ideal liquids which distil as such without change in its composition at a constant temperature as though it were a pure liquid. This mixture is known as [CBSE PMT 1990] |
| A. | Binary liquid mixture |
| B. | Azeotropic mixture |
| C. | Eutectic mixture |
| D. | Ideal mixture |
| Answer» C. Eutectic mixture | |
| 20. |
The azeotropic mixture of water \[(b.p{{.100}^{o}}C)\] and \[HCl\,(b.p.\,{{85}^{o}}C)\] boils at \[{{108.5}^{o}}C\]. When this mixture is distilled it is possible to obtain[IIT 1981] |
| A. | Pure \[HCl\] |
| B. | Pure water |
| C. | Pure water as well as pure \[HCl\] |
| D. | Neither \[HCl\] nor \[{{H}_{2}}O\] in their pure states |
| Answer» E. | |
| 21. |
The Van't Hoff factor for sodium phosphate would be |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 22. |
Acetic acid dissolved in benzene shows a molecular weight of [MP PET 1993, 02] |
| A. | 60 |
| B. | 120 |
| C. | 180 |
| D. | 240 |
| Answer» C. 180 | |