MCQOPTIONS
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MCQOPTIONS
This section includes 35 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the relationship between the average velocity (v), root mean square velocity (u) and most probable velocity a [AFMC 1994] |
| A. | \[\alpha :v:u::1:1.128:1.224\] |
| B. | \[\alpha :v:u::1.128:1:1.224\] |
| C. | \[\alpha :v:u::1.128:1.224:1\] |
| D. | \[\alpha :v:u::1.124:1.228:1\] |
| Answer» B. \[\alpha :v:u::1.128:1:1.224\] | |
| 2. |
300 ml of a gas at \[{{27}^{o}}C\] is cooled to \[-{{3}^{o}}C\] at constant pressure, the final volume is [NCERT 1981, MP PMT 1992] |
| A. | 540 ml |
| B. | 135 ml |
| C. | 270 ml |
| D. | 350 ml |
| Answer» D. 350 ml | |
| 3. |
The Vander Waal's constant 'a' for the gases \[{{O}_{2}},\,{{N}_{2}},\,N{{H}_{3}}\] and \[C{{H}_{4}}\]are 1.3, 1.390, 4.170 and 2.253 \[{{L}^{2}}\,atm\,mo{{l}^{-2}}\] respectively. The gas which can be most easily liquefied is [IIT 1989] |
| A. | \[{{O}_{2}}\] |
| B. | \[{{N}_{2}}\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[C{{H}_{4}}\] |
| Answer» D. \[C{{H}_{4}}\] | |
| 4. |
Adiabatic demagnetisation is a technique used for [BHU 1984] |
| A. | Adiabatic expansion of a gas |
| B. | Production of low temperature |
| C. | Production of high temperature |
| D. | None |
| Answer» C. Production of high temperature | |
| 5. |
A gas has a density of 2.68 \[g/L\] at stp. Identify the gas |
| A. | \[N{{O}_{2}}\] |
| B. | Kr |
| C. | COS |
| D. | \[S{{O}_{2}}\] |
| Answer» D. \[S{{O}_{2}}\] | |
| 6. |
In which one of the following situations a chemical reaction does not occur? [NDA] |
| A. | Common salt is exposed to air |
| B. | Coal is burnt in air |
| C. | Sodium is placed in water |
| D. | Iron is kept in moist air |
| Answer» B. Coal is burnt in air | |
| 7. |
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard? [NDA] |
| A. | \[^{\text{1}}{{\text{H}}_{\text{1}}}\] |
| B. | \[^{\text{12}}{{C}_{6}}\] |
| C. | \[^{\text{16}}{{O}_{8}}\] |
| D. | \[^{35}C{{I}_{17}}\] |
| Answer» C. \[^{\text{16}}{{O}_{8}}\] | |
| 8. |
Which one of the following mixtures is homogeneous?[NDA] |
| A. | Starch and sugar |
| B. | Methanol and water |
| C. | Graphite and charcoal |
| D. | Calcium carbonate and calcium bicarbonate |
| Answer» C. Graphite and charcoal | |
| 9. |
Which one of the following elements shows variable equivalent mass? [NDA] |
| A. | Zinc |
| B. | Silver |
| C. | Calcium |
| D. | Iron |
| Answer» E. | |
| 10. |
What is the weight of one atom of Hydrogen in grams? [NDA] |
| A. | \[6.23\times {{10}^{-23}}\] |
| B. | \[1.66\times {{10}^{-24}}\] |
| C. | \[6.62\times {{10}^{-24}}\] |
| D. | None of these |
| Answer» C. \[6.62\times {{10}^{-24}}\] | |
| 11. |
At NTP, the least volume will be occupied by 15 g of which one of the following?[NDA] |
| A. | \[N{{H}_{3}}\] |
| B. | \[{{O}_{2}}\] |
| C. | \[{{N}_{2}}\] |
| D. | Ne |
| Answer» D. Ne | |
| 12. |
The process used to separate oil and water is |
| A. | distillation |
| B. | sublimation |
| C. | separating funnel |
| D. | chromatography |
| Answer» D. chromatography | |
| 13. |
Tails of comets are visible due to |
| A. | Tyndall Effect |
| B. | Reflection |
| C. | Brownian movement |
| D. | None of these |
| Answer» B. Reflection | |
| 14. |
What is the term used to denote the critical temperature at which the air becomes saturated with vapour and below which the condensation is likely to begin? [NDA] |
| A. | Condensation point |
| B. | Evaporation point |
| C. | Dew point |
| D. | Point of critical temperature |
| Answer» D. Point of critical temperature | |
| 15. |
Which one among the following is not a mixture? |
| A. | Graphite |
| B. | Glass |
| C. | Brass |
| D. | Steel |
| Answer» B. Glass | |
| 16. |
Which one among the following statements regarding the properties of mixtures and compounds is not correct? [NDA] |
| A. | A mixture shows the properties of its constituents but the properties of a compound are entirely different from its constituents |
| B. | A mixture may be homogeneous or heterogeneous but a compound is a homogeneous substance |
| C. | The constituents of a mixture can be separated by physical methods but those of a compound cannot be separated by physical methods |
| D. | Energy is either absorbed or evolved during the preparation of a mixture but not in the preparation of a compound |
| Answer» E. | |
| 17. |
Which one of the following is not a mixture? [NDA] |
| A. | Air |
| B. | Mercury |
| C. | Milk |
| D. | Cement |
| Answer» C. Milk | |
| 18. |
The oxide of which of the following elements is used as a coolant? |
| A. | Silicon |
| B. | Nitrogen |
| C. | Carbon |
| D. | Phosphorus |
| Answer» D. Phosphorus | |
| 19. |
Kerosene is a mixture of |
| A. | aromatic hydrocarbons |
| B. | aliphatic hydrocarbons |
| C. | saturated hydrocarbons |
| D. | alicyclic hydrocarbons |
| Answer» C. saturated hydrocarbons | |
| 20. |
A pungent smell often present near the urinals is due to |
| A. | sulphur-di-oxide |
| B. | chlorine |
| C. | ammonia |
| D. | urea |
| Answer» D. urea | |
| 21. |
When we put some crystals of potassium permanganate in a beaker containing water, we observe that after sometime whole water has turned pink. This is due to |
| A. | boiling |
| B. | melting of potassium permanganate crystals |
| C. | sublimation of crystals |
| D. | diffusion |
| Answer» E. | |
| 22. |
At higher altitudes |
| A. | boiling point of a liquid increases |
| B. | boiling point of a liquid decreases |
| C. | no change in boiling point |
| D. | melting point of solid increases |
| Answer» C. no change in boiling point | |
| 23. |
The boiling point of alcohol is \[78{}^\circ C\]. What is this temperature in Kelvin scale |
| A. | 373 K |
| B. | 351 K |
| C. | 375 K |
| D. | 78 K |
| Answer» C. 375 K | |
| 24. |
Boyle's law states that the |
| A. | pressure of a gas is directly proportional to the temperature at constant volume |
| B. | pressure of a gas is inversely proportional the volume at constant temperature |
| C. | volume is directly proportional to the temperature at constant pressure |
| D. | None of the above |
| Answer» C. volume is directly proportional to the temperature at constant pressure | |
| 25. |
Non-reacting gases have a tendency to mix with each other. This phenomenon is known as |
| A. | chemical reaction |
| B. | diffusion |
| C. | effusion |
| D. | explosion |
| Answer» C. effusion | |
| 26. |
Select the correct order of evaporation for water, alcohol, petrol and kerosene oil |
| A. | water > alcohol > kerosene oil > petrol |
| B. | alcohol > petrol > water > kerosene oil |
| C. | petrol > alcohol > water > kerosene oil |
| D. | petrol > alcohol > kerosene oil > water |
| Answer» E. | |
| 27. |
Which of the following is a good lubricant?[CDS] |
| A. | Diamond powder |
| B. | Graphite powder |
| C. | Molten carbon |
| D. | Alloy of carbon and iron |
| Answer» C. Molten carbon | |
| 28. |
Vermicompost is an/a [CDS] |
| A. | inorganic fertilizer |
| B. | toxic substance |
| C. | organic bio fertilizer |
| D. | synthetic fertilizer |
| Answer» D. synthetic fertilizer | |
| 29. |
Which one among the following is a sin smelling agent added to LPG cylinder to help the detection of gas leakage? [CDS] |
| A. | Ethanol |
| B. | Thioethanol |
| C. | Methane |
| D. | Chloroform |
| Answer» C. Methane | |
| 30. |
The chemical technique applied to find out age of fossils is knows as |
| A. | Carbon dating |
| B. | Nuclear fusion |
| C. | Photosynthesis |
| D. | Fermentation |
| Answer» B. Nuclear fusion | |
| 31. |
Match the following A. Azidothymidine 1. Antibiotic B. cis-Platin and taxol 2. Drugs for AIDS patient C. Streptomycin 3. Drugs for treating cancer patients D. Paracetamol 4. Antipyretic |
| A. | A-2,B-3,C-1,D-4 |
| B. | A-1,B-2,C-4,D-3 |
| C. | A-4,B-2,C-3,D-1 |
| D. | A-1,B-2,C-3,D-4 |
| Answer» B. A-1,B-2,C-4,D-3 | |
| 32. |
Who among the following is called. The father of modem chemistry? |
| A. | Michael Faraday |
| B. | Lavoisier |
| C. | Proust |
| D. | Linus Pauling |
| Answer» C. Proust | |
| 33. |
Which chemical was an important symbol in our freedom struggle? [CDS] |
| A. | Glucose |
| B. | Fertilizer |
| C. | Medicine |
| D. | Sodium chloride |
| Answer» C. Medicine | |
| 34. |
The main of component of Biogas is |
| A. | Methane |
| B. | Ethane |
| C. | Propane |
| D. | Butane |
| Answer» B. Ethane | |
| 35. |
The main component of Gobar gas is? [CDS] |
| A. | Chlorine |
| B. | Hydrogen |
| C. | Ethylene |
| D. | Methene |
| Answer» E. | |