#### Gaseous State Model Question Paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
10 x 1 = 10
1. Rate of diffusion of a gas is

(a)

directly proportional to its density

(b)

directly proportional to its molecular weight

(c)

directly proportional to its square root of its molecular weight

(d)

inversely proportional to the square root of its molecular weight

2. The value of universal gas constant depends upon

(a)

Temperature of the gas

(b)

Volume of the gas

(c)

Number of moles of the gas

(d)

units of Pressure and volume.

3. Compressibility factor for CO2 at 400 K and 71.0 bar is 0.8697. The molar volume of CO2 under these conditions is

(a)

22.04 dm3

(b)

2.24 dm3

(c)

0.41 dm3

(d)

19.5 dm3

4. Pressure is _____________

(a)

Force/ area

(b)

force x Area

(c)

Area/ force

(d)

Force / area $\times$ volume

5. The hydrogen balloon was invented by ______________

(a)

Robert Boyle

(b)

J.A.C. Charles

(c)

Maxwell

(d)

Gay Lussac

6. The rate of diffusion of gas is  ________________ to square root of their molecular mass.

(a)

inversely proportional

(b)

directly proportional

(c)

equal

(d)

twice

7. Compression factor Z is given by _____________

(a)

PV/nRT

(b)

P/nRT

(c)

PV/R

(d)

PV/T

8. Pick out the correct relation for 1 mole of real gas.

(a)

$\left( P+\frac { V }{ { a }^{ 2 } } \right) (V-b)=RT$

(b)

$P=\frac { RT }{ (V-b) } +\frac { a }{ { V }^{ 2 } }$

(c)

$\left( P+\frac { a }{ { V }^{ 2 } } \right) (V-b)=RT$

(d)

$\left( P-\frac { a }{ { V }^{ 2 } } \right) (V+b)=\frac { 1 }{ RT }$

9. Maximum deviations from ideal gas is expected from:

(a)

H2(g)

(b)

N2(g)

(c)

CH4(g)

(d)

NH3(g)

10. Gas equation PV = nRT is obeyed by:

(a)

only isothermal process

(b)

(c)

both (a) and (b)

(d)

none of the above

11. 5 x 2 = 10
12. Suppose there is a tiny sticky area on the wall of a container of gas. Molecules hitting this area stick there permanently. Is the pressure greater or less than on the ordinary area of walls?

13. Why do astronauts have to wear protective suits when they are on the surface of moon?

14. Why are the airplane cabins artificially pressurized?

15. According to kinetic theory. What are the two assumptions made with regard to ideal gas?

16. Define rate of diffusion

17. 5 x 3 = 15
18. Which of the following gases would you expect to deviate from ideal behavior under conditions of low-temperature F2, CI2, or Br2? Explain.

19. Give the graphical representation of Boyle's law.

20. In the below figure, let us find the missmg parameters [volume in (b) and temperature in (c)]
PI = 1 atm, P2 = 1 atm, P3 = 1 atm
V1 = 0.3 dm3, V2 = ? dm3, V3 = 0.15 dm3
T1 = 200 K, T2 = 300 K, T3 = ? K.

21. Explain the graphical representation of Charles' law.

22. What is meant by Boyle temperature (or) Boyle point? How is it related with compression point?

23. 3 x 5 = 15
24. Explain whether a gas approaches on ideal behavior or deviates from ideal behaviour if
(a) it is compressed to a smaller volume at constant temperature.
(b) the temperature is raised at while keeping the volume constant
(c) more gas is introduced into the same volume and at the same temperature

25. How will you calculate the partial pressure in terms of mole fraction?

26. Inside a certain automobile engine, the volume of air in a cylinder is 0.375 dm3, when the pressure is 1.05 atm. When the gas is compressed to a volume of 0.125 dm3 at the same temperature, what is the pressure of the compressed air?