InterviewSolution
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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.
| 1. |
Some moles of `O_(2)` diffuse through a small opening in 18 second. Same number of moles of an unknown gas diffuse through the same opening in 45 second. Molecular mass of the unknown gas isA. `32 xx ((45)^(2))/((18)^(2))`B. `32 xx ((18)^(2))/((45)^(2))`C. `(32)^(2) xx (45)/(18)`D. `(32)^(2) xx (18)/(45)` |
| Answer» Correct Answer - A | |
| 2. |
At `0^(@)C` and one atm pressure, a gas occupies 100 cc. If the pressure is increased to one and a half-time and temprature is increased by one-third of absolute temperature, then final volume of the gas will be:A. 80 ccB. `88.9 cc`C. `66.7 cc`D. `100 cc` |
| Answer» Correct Answer - B | |
| 3. |
The root mean square speed of hydrogen molecules of an ideal hydrogen gas kept in a gas chamber at `0^(@)C` is 3180 m/s. The pressure on the hydrogen gas is ……….. (Density of hydrogen gas is `8.99xx10^(-2)kg//m^(3)`, 1 atmosphere= `1.01xx10^(5)N/m^(2)`A. 1.0 atmosphereB. 1.5 atmoshpereC. 2.0 atmosphereD. 3.0 atmosphere |
| Answer» Correct Answer - D | |
| 4. |
Mark the statement which is correct:A. Surface tension of a liquid increases with temperatureB. Addition of chemicals reduces the surface tension of a liquidC. Stalagmomter is used for measuring viscosity of the liquid.D. Viscosity of the liquid does not depend on intermolecular forces. |
| Answer» Correct Answer - B | |
| 5. |
Water boils at lower temperature on high altitude because:A. atmospheric pressure is low thereB. atmospheric pressure is high thereC. water is weakly hydrogen bonded thereD. water in pure form is found there |
| Answer» Correct Answer - A | |
| 6. |
Assertion: The pressure of a fixed amount of an ideal gas is proportional to its temperature. Reason: Frequency of collisions and their impact both increase in proportion of the square root of temperature.A. If both A and R are correct and R is the correct explanation of AB. If both A and R are correct but R is not the correct explanation of AC. If A is correct but R is incorrectD. If A is incorrect but R is correct |
| Answer» Correct Answer - C | |
| 7. |
Which of the following diagrams correctly decribes the behavior of a fixed mass of an ideal gas ? (`T` is measured in `K`)A. B. C. D. |
| Answer» Correct Answer - D | |
| 8. |
For an ideal gas, number of moles per litre in terms of its pressure P, gas constant R and temperature T isA. `PT//R`B. `PRT`C. `P//RT`D. `RT//P` |
| Answer» Correct Answer - C | |
| 9. |
The Ne atom has 10 times the mass of `H_(2)` molecule. Which of the following statements is true? I. At `25^(@)C` both of them have the same kinetic energy. II. Ten moles of `H_(2)` would have the same volume as 1 mole of Ne at same temp. and pressure. III. One mole of Ne exerts the same pressure as one mole of `H_(2)` at STP. IV. A `H_(2) ` molecule travels 10 times faster than Ne atom at same temperature. V. At STP, one litre of Ne has 10 times the density of 1 litre of `H_(2).`A. Both these gases have same kinetic energy at `27^(@)C`B. `H_(2)` molecule will travel 10 times faster than Ne atom at same temperatureC. Pressure of 1 mole Ne atom and 1 mole `H_(2)` molecules will be sameD. Ten mole of `H_(2)` and 1 mole of Ne will have same volume at a temperature of `27^(@)C` |
| Answer» Correct Answer - A::B::C | |
| 10. |
Assertion: Under similar conditions of temperature and pressure,`O_(2)` diffuses `1.4` times faster than `SO_(2)`. Reason: Density of `SO_(2)` is `1.4` times greater than that of `O_(2)`.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - C | |
| 11. |
The following is a method to determine the surface tension of liquids :A. single capillary methodB. refractometic methodC. polarimetric methodD. boiling point method |
| Answer» Correct Answer - A | |
| 12. |
The maximum number of molecules is present inA. 15 L of `H_(2)` gas at STPB. 5 L of `N_(2)` gas at STPC. 0.5 g of `H_(2)` gasD. 10 g of `O_(2)` gas |
| Answer» Correct Answer - A | |
| 13. |
Select the correct conditions indicated below the following plots :A. B. C. D. |
| Answer» Correct Answer - A::C::D | |
| 14. |
Which of the following volume-temperature `(V-I)` plots represents the behaviour of `1 "mole"` of an ideal gas at the atmospheric pressure?A. B. C. D. |
| Answer» Correct Answer - C | |
| 15. |
Which one of the following is not the value of R ?A. `1.99 cal K^(-1) mol^(-1)`B. `0.0821 "litre"- atm K^(-1) mol^(-1)`C. `9.8 k cal K^(-1) mol^(-1)`D. `8.3 J K^(-1) mol^(-1)` |
| Answer» Correct Answer - C | |
| 16. |
Find the rms speed of an argon molecule at `27^(@)C` (Molecular weight of argon = 40 gm/mol)A. `234.2 m//s`B. `342.2 m//s`C. `432.2 m//s`D. `243.2 m//s` |
| Answer» Correct Answer - C | |
| 17. |
The value of gas contant per degree per mol is approximately :A. 1 calB. 2 calC. 3 calD. 4 cal |
| Answer» Correct Answer - B | |
| 18. |
In general gas equation, `PV = nRT, V` is the volume of :A. `n` moles of a gasB. any amount of a gasC. one mole of a gasD. one gram of a gas |
| Answer» Correct Answer - A | |
| 19. |
For the given ideal gas equation `PV=nRT`, answer the following questions: In the above equation, the value of universal gas constant depends only uponA. the nature of the gasB. the units of measurementC. the pressure of the gasD. the temperature of the gas |
| Answer» Correct Answer - B | |
| 20. |
The viscosity of a liquid molecule depends on :A. the volume of the liquidB. the temperature of the liquidC. the surface area of the liquidD. the structure of the molecule |
| Answer» Correct Answer - B::D | |
| 21. |
Which of the following expressions regarding the unit of coefficient of viscosity is not true?A. dyne `cm^(-2)` secB. dyne `cm^(2) sec^(-1)`C. `Nm^(-2)` secD. 1 poise `= 10^(-1) Nm^(-2) sec` |
| Answer» Correct Answer - B | |
| 22. |
The boiling point of water, ethyl alcohol and diethyl ether are `100^(@)C, 78.5^(@)C` respectively. The intermolecular forces will be in the order of:A. water `gt` ethyl alcohol `gt` diethyl etherB. ethyl alcohol `gt` water `gt` diethyl etherC. diethyl ether `gt` ethyl alcohol `gt` waterD. diethyl ether `gt` water `gt` ethyl alcohol |
| Answer» Correct Answer - A | |
| 23. |
Which of the following expressions correctly represents the relationship between the average molar kinetic energies `(KE)` of `CO` and `N_(2)` molecules at the same temperature?A. `bar(KE_(CO)) = bar(KE_(N_(2)))`B. `bar(KE_(CO)) gt bar(KE_(N_(2)))`C. `bar(KE_(CO)) lt bar(KE_(N_(2)))`D. Cannot be predicted unless the volumes of the gases are given |
| Answer» Correct Answer - A | |
| 24. |
Assertion: Effusion rate of oxygen is smaller than nitrogen. Reason: Molecular size of nitrogen is smaller than oxygen.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - C | |
| 25. |
Assertion: Nitrogen is unreactive at room temperature but becomes reactive at elevated temperature (on heating or in the presence of catalysts). Reason: In nitrogen molecule, there is extensive delocalisation of electrons.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - C | |
| 26. |
Consider a mixture of oxygen and hydrogen kept at room temperature, As compared to a hydrogen molecule an oxygen molecule hits the wallA. With greater average kinetic energyB. With smaller average kinetic energyC. With smaller average speedD. With smaller average speed and smaller average kinetic energy |
| Answer» Correct Answer - C | |
| 27. |
Assertion: Gases are easily absorbed on the surface of metals, especially transition metals. Reason: Transition metals have free valenciesA. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - A | |
| 28. |
If `m_(1),m_(2)` are masses of an ideal gas, then which of the graph represents `m_(2)gtm_(1)` ?.A. B. C. D. |
| Answer» Correct Answer - A::B::C | |
| 29. |
If `10 g` of a gas at atmospheric pressue is cooled from `273^(@)C` to `0^(@)C`, keeping the volume constant, its pressure would becomeA. `(1)/(2) atm`B. `(1)/(273) atm`C. `2 atm`D. 273 atm |
| Answer» Correct Answer - A | |
| 30. |
By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?A. `1.4`B. 2C. `2.8`D. `4.0` |
| Answer» Correct Answer - A | |
| 31. |
The density of the gas is equal to: [P = Pressure, V = Volume, T = Temperature, R = Gas constant, n = number of mole, M = molecular massA. `nP`B. `MP//RT`C. `P//RT`D. `M//V` |
| Answer» Correct Answer - B | |
| 32. |
Assertion: van der Waals equation is applicable only to non-ideal gases. Reason: Ideal gases obey the equation `PV=nRT`.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - B | |
| 33. |
Assertion: At constant temperature, if pressure on the gas is doubled, density is also doubled. Reason: At constant temperature, molecular mass of a gas is directly proportional to the density and inversely proportional to the pressureA. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - C | |
| 34. |
Assertion: Compressibility factor `(Z)` for non ideal gases is always greater than `1`. Reason: Non-ideal gases always exert higher pressure than expected.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - D | |
| 35. |
Assertion: Most probable velocity is the velocity possessed by maximum fraction of molecules at the same temperature. Reason: On collision, more and more molecules acquire higher speed at the same temperature.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true but R is falseD. If both A and R are false |
| Answer» Correct Answer - C | |
| 36. |
In the following statements : (A) Ideal gases are liquefied only at very low temperature (B) Ideal gases cannot be liquefied (C) Ideal gas behaviour is observed by real gases at low pressure (D) Ideal gases do not exist The correct statements are :A. A, B, C and DB. A, B and CC. B, C and DD. C and D |
| Answer» Correct Answer - C | |
| 37. |
Kinetic theory of gases is a generalization offered by Maxwell. Boltzmann, Clausius, etc. to explain the behaviour of ideal gases. This theory assumes that ideal gas molecules neither attract nor repel each other. Average kinetic energy of gas molecules is directly proportional to the absolute temperature. A gas equation called kinetic gas equation was derived on the basis of kinetic theory `PV = (1)/(3) mv^(2)` The average kinetic energy per molecule of an ideal gas is equal to :A. `0.5 kJ`B. `0.5 RT`C. `1.5 kT`D. `1.5 RT^(2)` |
| Answer» Correct Answer - C | |
| 38. |
The respective speeds of five molecules are 2, 1.5, 1.6, 1.6 and 1.2 km/sec. The most probable speed in km/sec will be:A. 2B. `1.58`C. `1.6`D. `1.31` |
| Answer» Correct Answer - D | |
| 39. |
Kinetic theory of gases is a generalization offered by Maxwell. Boltzmann, Clausius, etc. to explain the behaviour of ideal gases. This theory assumes that ideal gas molecules neither attract nor repel each other. Average kinetic energy of gas molecules is directly proportional to the absolute temperature. A gas equation called kinetic gas equation was derived on the basis of kinetic theory `PV = (1)/(3) mv^(2)` Which of the following do not pertain to the postulates of kinetic theory of gaes ?A. The gas molecules are perfectly elasticB. Speed of gas molecules are ever changingC. Pressure exerted by the gas is due to the collision of molecules with the walls of the containerD. Kinetic energy of a gas is given by the sum of 273 and temperature in Celsius scale |
| Answer» Correct Answer - A::D | |
| 40. |
Densities of two gases are in the ratio `1: 2` and their temperatures are in the ratio `2:1`, then the ratio of their respective pressure isA. `1 : 1`B. `1 : 2`C. `2 : 1`D. `4 : 1` |
| Answer» Correct Answer - A | |
| 41. |
According to kinetic theory of gases:A. collisions are always elasticB. heavier molecules transfer more momentum of the wall of containerC. only a small number of molecules have very high velocityD. between collisions, the molecules move in straight lines with constant velocities |
| Answer» Correct Answer - A::C::D | |
| 42. |
Which of the following graphs is not a straight line for an ideal gas ?A. `V rarr T`B. `T rarr P`C. `n rarr (1)/(T)`D. `n rarr (1)/(P)` |
| Answer» Correct Answer - D | |
| 43. |
A box is divided into two equal compartments by a thin partition and they are filled with gases X and Y respectively. The two compartments have a pressure of 250 torr each. The pressure after removing the partition will be equal to:A. 125 torrB. 500 torrC. 250 torrD. 750 torr |
| Answer» Correct Answer - C | |
| 44. |
The rate of diffusion of a gas isA. directly proportional to its densityB. directly proportional to its molecular massC. directly proportional to the square of its molecular massD. inversely proportional to the square root of its molecular mass |
| Answer» Correct Answer - D | |
| 45. |
The rate of diffusion of hydrogen is about:A. one-half that of heliumB. 1.4 times that of heliumC. twice that of heliumD. four times that of helium |
| Answer» Correct Answer - B | |
| 46. |
The rate of diffusion of a gas having molecular weight just double of nitrogen gas is `56 m L s^(-1)`. The rate of diffusion of nitrgoen will be :A. `79.19 mL s^(-1)`B. `112.0 mL s^(-1)`C. `56 mL s^(-1)`D. `90.0 mL s^(-1)` |
| Answer» Correct Answer - A | |
| 47. |
Equal masses of methane and oxygen are mixed in an empty container at `25^(@)C`. The fraction of the total pressure exerted by oxygen is:A. `(1)/(2)`B. `(2)/(3)`C. `(1)/(3) xx (273)/(298)`D. `(1)/(3)` |
| Answer» Correct Answer - D | |