Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

One mole of which of the following has the highest entropy ?

  • Liquid nitrogen

  • Hydrogen gas

  • Mercury

  • Diamond


2.

Amines behave as :

  • Lewis acid

  • Lewis base

  • aprotic acid

  • neutral compound


3.

1 mole of H2SO4 is mixed with 2 moles of NaOH .The heat evolved will be :

  • 57.3 kJ

  • 2 x 57.3 kJ

  • 57.3/2 kJ

  • Cannot be predicted


4.

One mole. of a perfect gas expands isothermally to ten times of its original volume. The change in entropy is :

  • 0.1 R

  • 2.303 R

  • 10.0 R

  • 100.0 R


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5.

For the reaction :

N2 + 3H2  2NH3H = ?

  • E + 2RT

  • E - 2RT

  • E + RT

  • E - RT


6.

100 cc of 0.6 N H2SO4 and 200 cc of 0.3 N HCl were mixed together .The normality of the solution will be :

  • 0.2 N

  • 0.4 N

  • 0.8 N

  • 0.6 N


7.

If the mass defect of 40X is 0.090 u , then binding energy per nucleon is :

(1 u = 931.5 MeV)

  • 9.315 MeV

  • 931.5 MeV

  • 83.0 MeV

  • 8.38 MeV


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8.

50 mL of 0.1 M HCl and 50 mL of 0.2 M NaOH are mixed .The pH of the resulting solution is :

  • 1.30

  • 4.2

  • 12.70

  • 11.70


C.

12.70

50 mL of0.1 M HCl = 0.1 × 501000 = 5 x 10-3

50 mL of 0.2 M NaOH = 0.2 × 501000 = 10 x 10-3

Hence , after neutralisation NaOH left 

= 10 x 10-3 - 5 x 10-3 = 5 x 10-3

Total volume = 100 cc

The concentration of NaOH

5 x 10-3 x 1000100 = 0.05 M

[OH-] = 0.05 M = 5 x 10-2 M

pOH = - log [OH-]

= - log [5 x 10-2]

= 1.3010

pH + pOH = 14

pH = 14 - 1.3010

= 12.699

= 12.70


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9.

27Co60 is radioactive because :

  • its atomic number is high

  • it has high pn ratio

  • it has high np ratio

  • None of the above


10.

Conjugate acid of CH3NH2 is :

  • CH3OH

  • CH3NH3+

  • CH2NH2+

  • CH3N-H


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