Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

If the pH of HCl soltion is 2 then the molar concentration of this will be :

  • 0.01 M

  • 2 M

  • 0.4 M

  • 0.02 M


A.

0.01 M

pH = - log [H+]

2 = - log [H+]

[H+] = 10-2 = 0.01 M


2.

The value of magnetic quantum number for l = 3 :

  • 0 , +1 , +2 , +3

  • 0 , ± 1 , ± 2 , ± 3

  • -1 , -2 , -3

  • ± 1 , ± 2 , ± 3


B.

0 , ± 1 , ± 2 , ± 3

l = 3
m = -3 , - 2 , -1 , 0 , +1 , +2 , +3
or ± 1 , ± 2 , ± 3


3.

The geometry of ammonia is :

  • tetrahedral

  • pyramidal

  • triangular

  • trigonal bipyrarnidal


D.

trigonal bipyrarnidal

Hybridisation state in NH3 is sp3 , But its geometry is trigonal bipyramidal due to the presence of lone pair on N atom .


4.

Number of electron in one molecule of NH3 :

  • 17

  • 34

  • 7

  • 10


A.

17

Total number of electron in = NH3
N + H3 = 14 + 3 = 17


5.

Fermentation is :

  • reversible

  • exothermic

  • endothermic

  • None of these


B.

exothermic

Fermentation is the exothermic process.


6.

The ionisation percentage of 0.2 M HCN the solution is 0.02%. What will be the value of ionisation constant ?

  • 8 x 10-5

  • 8 x 10-9

  • 8 x 10-7 

  • 8 x 10-3


A.

8 x 10-5

Kh = Cα2 = 0.2 x (0.02)4

= 0.2 X 0.0004

= 8 x 10-5


7.

BF3 molecule is :

  • Lewis base

  • Lewis acid

  • Neutral

  • None of these


B.

Lewis acid

BF3 molecule is Lewis acid.


8.

Which one act as Bronsted acid as well as Bronsted base?

  • Cl-

  • OH-

  • HCl

  • H2O


D.

H2O

H2O is Bronsted acid and base both :

H2OAcid + H2OBase  H3O+Acid + OHBase


9.

NO212 O2  NO3 .......K1

2NO2 + O2  2NO3 ........K2

For the above reaction the relation between equilibrium constant is :

  • K2 = (K1)2

  • K21K1

  • K21K12

  • K1 = K2


A.

K2 = (K1)2

K1[NO3][NO2] [O2]1/2

K2[NO3]2[NO2]2[O2]

so , K2 = (K1)2


10.

Which one have the highest melting point ?

  • CsCl

  • NH3

  • He

  • CHCl3


A.

CsCl

CsCl is an ionic compound. it has the highest melting point.