(Test) Chemistry Sample Test Paper (Paer - 1)

Sample Cemistry Test : (Paer - 1)

Note : Answers in red.

1. In the above maxwellian plot at two different temperature which of the following statements may be not true

- Area under the two plots is the same

- Fraction of molecules with speed u₁ at T₁ > fraction of molecules having speed u₂ at T₂

- U₂ > U₁ and T₂ > T₁

- U_MPS at T₁ < U_MPS at T₂ ; U_RMS at T₁ < U_RMS at T₂

2. Which of the following are not correct statements ?
 - vander Waals constant `a' is a measure of attractive force

 - van der Waals constant `b' is also called co-volume or excluded volume

 - `b' is expressed in L mol^_1

 - `a' is expressed in atm L² mol^-1

3. See the figure : The valves of X and Y are opened simultaneously. The white fumes of NH₄Cl will first form at:

- A

- B

- C

- A, B and C simultaneously

4. A teaChemr enters a classroom from front door while a student from back door. There are 13 equidistant rows of benChems in the classroom. The teaChemr releases N₂O, the laughing gas, from the first bench while the student releases the weeping gas (C₆H₁₁OBr) from the last bench. At which row will the students starts laughing and weeping simultaneously
- 7

- 10

- 9

- 8

5. One litre of a gaseous mixture of two gases effuses in 311 seconds while 2 litres of oxygen takes 20 minutes. The density of gaseous mixture containing CH₄ and - H₂ is
- 4 gm/L

- 4.3 gm/L

- 3.4 gm/L

- 5 gm/L

6. Pure O₂ diffuses through an aperture in 224 second, whereas mixture of O₂ and another gas containing 80% O₂ diffuses from the same in 234 second. The molecular mass of gas will be
- 45.6

- 48.6

- 50

- 46.6

7. Figure displays the plot of the compression factor Z verses p for a few gases Which of the following statements is/are not correct for a van-der waals gas ?

- The plot I is applicable provided the vander waals constant a is negligible.

- The plot II is applicable provided the vander waals constant b is negligible.

- The plot III is applicable provided the vander waals constants a and b are negligible.

- The plot IV is applicable provided the temperature of the gas is much higher than its critical temperature.

8. 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
 - 1/3

 -1/2

 - 2/3

- (1/3) (273/298)

9. The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is
- critical temperature

- Boyle temperature

- boiling temperature

- reduced temperature

10. In van der Waal's equation of state for a non-ideal gas the term that accounts for intermolecular forces is
- (V - b)

- - ANS

- RT

- (RT)^-1

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