#### 11th Standard Chemistry Gaseous State English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
1. When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

(a)

are above inversion temperature

(b)

exert no attractive forces on each other

(c)

do work equal to the loss in kinetic energy

(d)

collide without loss of energy

2. 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

3. 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.

4. Use of hot air balloon in sports at meteorological observation is an application of

(a)

Boyle's law

(b)

Newton's law

(c)

Kelvin's law

(d)

Brown's law

5. Consider the following statements
i) Atmospheric pressure is less at the top of a mountain than at sea level
ii) Gases are much more compressible than solids or liquids
iii) When the atmospheric pressure increases the height of the mercury column rises.
Select the correct statement

(a)

I and II

(b)

II and III

(c)

I and III

(d)

I, II and III

6. The variation of volume V, with temperature T, keeping pressure constant is called the coefficient of thermal expansion ie $\alpha =\frac { 1 }{ V } { \left( \frac { \partial V }{ \partial T } \right) }_{ P }$ . For an ideal gas a is equal to

(a)

T

(b)

1/T

(c)

P

(d)

none of these

7. Assertion: Critical temperature of CO2 is 304K, it can be liquefied above 304K.
Reason : For a given mass of gas, volume is to directly proportional to pressure at constant temperature

(a)

both assertion and reason are true and reason is the correct explanation of assertion

(b)

both assertion and reason are true but reason is not the correct explanation of assertion

(c)

assertion is true but reason is false

(d)

both assertion and reason are false

8. Which of the following diagrams correctly describes the behaviour of a fixed mass of an ideal gas? (T is measured in K)

(a)

(b)

(c)

(d)

All of these

9. Pressure is _____________

(a)

Force/ area

(b)

force x Area

(c)

Area/ force

(d)

Force / area $\times$ volume

10. The unit of pressure is _____________

(a)

Pascal

(b)

Torr

(c)

Bar

(d)

all the above

11. 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

12. V/T = constant is _____________ law.

(a)

Gay Lussac

(b)

Boyle's

(c)

Dalton's

(d)

Charles

13. The absolute zero is _____________

(a)

-273oC

(b)

273oC

(c)

OK

(d)

both a and c

14. The partial pressure of dry gas is

(a)

greater than that of wet gas

(b)

lesser than that of wet gas

(c)

equal to that of wet gas

(d)

none of these

15. Identify the correct mathematical expression of Graham's law of diffusion.

(a)

$\frac { { r }_{ 2 } }{ { r }_{ 1 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(b)

${ r }_{ 1 }r_{ 2 }=\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(c)

$\frac { { r }_{ 1 } }{ { r }_{ 2 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(d)

$\frac { { r }_{ 1 } }{ { r }_{ 2 } } ={ \left[ \frac { { M }_{ 2 } }{ { M }_{ 1 } } \right] }^{ 2 }$

16. What is the dominant intermolecular force or bond that must be overcome in converting liquid methanol to a gas?

(a)

London dispersion force

(b)

Hydrogen bonding

(c)

Dipole-dipole interaction

(d)

Covalent bonds

17. When the gas behaves ideally, the compression factor Z is

(a)

> 1

(b)

< 1

(c)

= 0

(d)

= 1

18. Which of the following gas(es) always show positive deviation from ideal behaviour?

(a)

CH4

(b)

CO2

(c)

NH3

(d)

H2

19. Viscosity of a liquid is a measure of

(a)

repulsive forces between the liquid molecules

(b)

frictional resistance

(c)

intermolecular forces between the molecules

(d)

none of the above