1) The rmsv of a gas molecule at pressure P is V. If the pressure increases two times, then the rmsv will become

1 0.5 V (2) V

3 2V 4 4V

STATES OF MATTER

3RT 3PVRMSV C PV constant

M M

1C Ans : 2 V

M

2) A SO2 molecule is four times heavier than CH4 molecule at 298 K. The kinetic energy of the SO2 molecule is

4

4

4

4

11 th that of CH molecule

4(2) 4 times that of CH molecule

3 Same as that of CH molecule

4 16 times that of CH molecule

K

4

3E nRT

2Ans : 3 Same as that of CH molecule

3) When the temperature of an ideal gas is increased from 27oC to 927oC, then its kinetic energy will be

1 same (2) two times

3 four times 4 eight times

1 2

1

2

2 1

K 1 K 2

K 1

K 2

K K

3 3E nRT E nRT

2 2E T 300 1

E T 1200 4

E 4E Ans : 3 Four times

4) Under similar conditions of temperature and pressure, the volume of a gas obeying the Vanderwaal’s equation

1 is greater than that of an ideal gas

(2) is less than that of an ideal gas

3 is the same as that of an ideal gas

4 depends on the amount of the gas

Ans : 2 is less than that of an ideal gas

Ideal gas: Volume of a molecule is

negligible compared to the total valume

of the gas

Real gas: Volume of a molecule is

Not negligible compared to the total

valume of the gas

5) Which of the following set consists of gases with same rate of diffusion?

2 2 2 2 3 8

2 2 3 8 2 2 3 4

1 H , D , Ne (2) CO , NO , C H

3 CO , NO , C H 4 N , CO , C H

2 2 3 544 44 44

Ans : 3 CO , N O, C H

1r

MGases with same molecular mass

have same rate of diffusion

6) If the pressure is tripled and temperature is halved, the volume of a given mass of an ideal gas becomes

31 times its original volume 22(2) rd of its original volume 313 th of its original volume 6

4 6 times its original volume

1 1 2 2

1 2

1 1 1 2

11

2 1

1Ans : 3 th of its original volume

6

T VP V P V

T T P V

P V 3P V 2V should decrease

TT2

1 V V

6

7) Dalton’s law of partial pressure is not applicable to which of the following mixture of gases?

2 2

2 2

2

3

1 SO and O at room temp.

(2) CO and N

3 CO and CO

4 HCl and NH

3Ans : 4 HCl and NH

Dalton's law: gases which do not react

with one-another

8) The ratio of the rates of diffusion of He and SO2 under identical conditions of pressure and temperature is

1 0.5 (2) 1

3 2 4 4

2

1 2 1 2

2 1 2 1

He

SO

r d r Mor

r d r M

r 644

r 4

Ans : 4 4

9) The container A and B have same gases. If the pressure, volume and temperature of A are twice that of B, then ratio of the number of molecules of A and B is

1 1: 2 (2) 2 :1

3 1: 4 4 4 :1

A

B

Ans : 2 2 :1

n 22 :1

n 1

10) The equation of state corresponding to 8g of O2 is

RT1 PV 8RT (2) PV

4RT

3 PV RT 4 PV2

PV nRT

n number of moles

given mass 8 1mol 0.25

molecular mass 32 4

1PV RT

4RT

Ans : 2 PV4

1) The oxidation numbers of sulphur in S8, H2S and SO4

2- respectively are

1 0, 2 and 6 (2) + 8, 2 and 6

3 0, 2 and 6 4 8, 2 and 6

OXIDATION NUMBER

8

2

24

S elemental state O.No. is zero

H S 2 1 x 0 x 2, O.No. is 2

SO x 4 2 2 x 6, O.No. is 6

Ans : 1 0, 2 and 6

2) In the conversion of Br2 to BrO3-, the

oxidation number of Br changes from

1 Zero to 5 (2) 1 to 5

3 Zero to 3 4 Zero to 5

2

3

Br O.No. is 0

BrO O.No. is x 3 2 1 x 5

O. No. is 5

When an element combines with more

EN element its O.No. increases

from 0 it changes to +5

Ans: 4

3) Oxidation number of Chromium in CrO5 is

1 10 (2) 5

3 6 4 5

4Cr O O

x 2 4 1 0

x 2 4 0

x 6 Ans : 2

Cr

O O

OO

O

4) The strongest acid among the following is

2

3 4

1 HClO (2) HClO

3 HClO 4 HClO

4

Higher the oxidation number stronger the acid.

In HClO , O.No. of Cl is +7

Ans: 4

5) Equivalent mass of oxidizing agent in the reaction

1 32 (2) 64

3 16 4 8

2 2 2SO 2H S 3S 2H O is

2

2

O.A. O.No. decreases SO is the O.A.

RA O.No. increase H S is the RA

molecular mass 64Eq.mass of OA= 16

Number of added 4Ans : 3

6) The oxidation number of Fe in Fe(CO)6 is

1 2 (2) 3

3 5 4 0

O.No. is zero

In metals, alloys and metal carbonyls, the

O.No. will be zero

Ans: 4

7) For the red-ox reaction,

in acidic medium, co-efficients of Zn, NO3-

and H+ in the balanced equation respectively are

23 4Zn NO Zn NH

1 4, 1, 7 (2) 7, 4, 1

3 4, 1, 10 4 1, 4, 10

2

3 4

3 4 2

3 4 2

Zn Zn No. of e 2

NO NH No. of e 8

8Zn 2NO 20H 8Zn 2NH 6H O

4Zn NO 10H 4Zn NH 3H O

Ans : 3 4, 1, 10

8) Which of the following is not a reducing agent?

2 2 2

2 2

1 SO (2) H O

3 CO 4 NO

2

2

Reducing agent will undergo oxidation

i.e., it can donate electrons.

Since CO cannot undergo oxidation. It is

not a reducing agent.

Ans : 3 CO

9) Equivalent mass of in acidic medium is

M1 M (2)

3M

3 4 2M5

4MnO

4 2 4 2 4 4 2

In acidic medium

2KMnO 3H SO K SO 2MnSO 3H O 5 O

2M ME 8

5 16 5M

Ans : 35

10) Which of the following oxides is ionic?

3

2 5 2 7

1 MnO (2) CrO

3 P O 4 Mn O

Lower oxidation state ionic

Higher oxidation state covalent

Ans: 1 MnO

11) The reaction

1 Oxidation reaction

(2) Reduction reaction

3 Dispropotionation reaction

4 Decomposition reaction

33ClO aq ClO aq 2Cl aq

is an example of

One molecule of the same substance

is reduced at the expense of the other

which is oxidised.

Ex.: Cannizzarro reaction

Ans: 3 Disproportionation reaction

11) The value of n in

1 5 (2)4

3 3 4 2

24 2MnO 8H ne Mn 4H O

is

24 2MnO 8H ne Mn 4H O

By equalizing charges1 8 n 2

on both the sides

n 5

Ans : 1

11) If M is the molecular weight of FeC2O4, then its equivalent weight in the conversion

M M1 (2)

3 6M

3 4 Equal to M2

32 4 2FeC O Fe CO is

Molecular massE

Change in oxidation number

M

1Ans : 4 Equal to M