#### Gaseous State One Mark Questions

11th Standard

Reg.No. :
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Chemistry

Time : 00:30:00 Hrs
Total Marks : 10
10 x 1 = 10
1. Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

(a)

at high pressure the collision between the gas molecule become enormous

(b)

at high pressure the gas molecules move only in one direction

(c)

at high pressure, the volume of gas become insignificant

(d)

at high pressure the intermolecular interactions become significant

2. Which of the following is the correct expression for the equation of state of van der Waals gas?

(a)

$\left( P+\frac { a }{ { n }^{ 2 }{ V }^{ 2 } } \right) (V-nb)=nRT$

(b)

$\left( P+\frac { na }{ { n }^{ 2 }{ V }^{ 2 } } \right) (V-nb)=nRT$

(c)

$\left( P+\frac { { an }^{ 2 } }{ { V }^{ 2 } } \right) (V-nb)=nRT$

(d)

$\left( \frac { P+{ n }^{ 2 }{ a }^{ 2 } }{ { V }^{ 2 } } \right) (V-ab)=nRT$

3. The temperatures at which real gases obey the ideal gas laws over a wide range of pressure is called

(a)

Critical temperature

(b)

Boyle temperature

(c)

Inversion temperature

(d)

Reduced temperature

4. A bottle of ammonia and a bottle of HCI connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be

(a)

At the center of the tube

(b)

Near the hydrogen chloride bottle

(c)

Near the ammonia bottle

(d)

Throughout the length of the tube

5. At identical temperature and pressure, the rate of diffusion of hydrogen gas is 3$\sqrt { 3 }$ times that of a hydrocarbon having molecular formula CnH2n-2. What is the value of n ?

(a)

8

(b)

4

(c)

3

(d)

1

6. Value of gas constant R is

(a)

0.082dm3atm

(b)

0.987 cal mol-1 K-1

(c)

8.3 J mol-1 K-1

(d)

8 er mol-1 K-1

7. Pressure is _____________

(a)

Force/ area

(b)

force x Area

(c)

Area/ force

(d)

Force / area $\times$ volume

8. The unit of pressure is _____________

(a)

Pascal

(b)

Torr

(c)

Bar

(d)

all the above

9. The instrument used for measuring atmospheric pressure is ________________

(a)

Beckmann thermometer

(b)

Galvanometer

(c)

Barometer

(d)

all the above

10. The standard atmospheric pressure is the pressure that supports a column of mercury exactly ___________ high at 0° C at sea level.

(a)

760mm

(b)

76 cm

(c)

both a & b

(d)

760 cm