Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Bond order of 1.5 is shown by

  • O2+

  • O2-

  • O22-

  • O22-


B.

O2-

Bond order of 1.5 is shown by

676 Views

2.

pH of a saturated solution of Ba(OH)2 is 12. The value of solubility product Ksp of Ba(OH)2 is

  • 3.3 x 10-7

  • 5.0 x 10-7

  • 4.0 x 10-6

  • 4.0 x 10-6


B.

5.0 x 10-7

pH of a saturated solution of Ba(OH)2 is 12. The value of solubility product Ksp of Ba(OH)2 is

3319 Views

3.

Maximum number of electrons in a subshell with l =3 and n=4 is

  • 14

  • 16

  • 10

  • 10


A.

14

Maximum number of electrons in a subshell with l =3 and n=4 is

798 Views

4.

Buffer solutions have constant acidity and alkalinity because

  • these give unionised acid or base on reaction with added acid or alkali

  • acids and alkalies in these solutions are shielded from attack by other ions.

  • they have a large excess of H+ or OH- ions

  • they have a large excess of H+ or OH- ions


A.

these give unionised acid or base on reaction with added acid or alkali

Buffer solutions have constant acidity and alkalinity because

574 Views

5.

Equimolar solutions of the following substances were prepared separately, which one of these will record the highest pH value?

  • BaCl2

  • AlCl3

  • LiCl

  • LiCl


A.

BaCl2

Equimolar solutions of the following substances were prepared separately, which one of these will record the highest pH value?

664 Views

6.

The correct set four quantum number for the valence electron of rubidium atom (z=37) is 

  • 5,1,1, +1/2

  • 6,0,0,+1/2

  • 5,0,0 +1/2

  • 5,0,0 +1/2


C.

5,0,0 +1/2

The correct set four quantum number for the valence electron of rubidium atom (z=37) is 

816 Views

7.

50 mL of each gas A and of gas B takes 150 and 200 s respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be

  • 96

  • 128

  • 20.2

  • 20.2


C.

20.2

50 mL of each gas A and of gas B takes 150 and 200 s respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be

1395 Views

8.

Standard enthalpy of vaporisation ΔvapHθ for water for water at 100oC is 40.66 kJ mol-1. The internal energy of vaporisation of water at 100o C (in KJ mol-1) is

(Assume water vapour to behave like an ideal gas.)

  • +37.56

  • -43.76

  • +43.76

  • +43.76


A.

+37.56

Standard enthalpy of vaporisation ΔvapHθ for water for water at 100oC is 40.66 kJ mol-1. The internal energy of vaporisation of water at 100o C (in KJ mol-1) is

(Assume water vapour to behave like an ideal gas.)

594 Views

9.

In which of the following reactions, standard reaction entropy changes (ΔSo) is positive and standard Gibb's energy change (ΔGo) decreases sharply with increasing temperature?

  • C (graphite) +1/2 O2 (g) → CO (g)

  • CO (g) +1/2 (g) → CO2 (g)

  • Mg(s)  +1/2O2 (g) → MgO (s)

  • Mg(s)  +1/2O2 (g) → MgO (s)


A.

C (graphite) +1/2 O2 (g) → CO (g)

In which of the following reactions, standard reaction entropy changes (ΔSo) is positive and standard Gibb's energy change (ΔGo) decreases sharply with increasing temperature?

1457 Views

10.

The enthalpy of fusion of water is 1.435 Kcal/mol. The molar entropy change for the melting of ice of at 0o C is

  • 10.52 cal/(mol K)

  • 21.04 cal/(mol K)

  • 5.260 cal/ (mol K)

  • 5.260 cal/ (mol K)


C.

5.260 cal/ (mol K)

The enthalpy of fusion of water is 1.435 Kcal/mol. The molar entropy change for the melting of ice of at 0o C is

861 Views