Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Which of the following is paramagnetic?

  • CO

  • N2

  • O2

  • H2O2


C.

O2

Among all the given options, oxygen or O2 contains only 2 unpaired electrons, hence it is paramagnetic.

O2σ1s2σ* 1s2σ2s2σ* 2s2σ2px2 π2py2π 2pz2π* 2py1π* 2pz1


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12.

Yellow phosphorus is kept in

  • water

  • kerosene

  • ether

  • alcohol


13.

An element 'Y' emits one α-and two β- particles to give 'X'. X and Y are

  • isotones

  • isobars

  • isotopes

  • isoelectronics


14.

Which of the following has sp3 -hybridisation?

  • BCl3

  • PCl3

  • BeCl3

  • None of these


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15.

The pH of 10-8M NaOH is

  • 8.0

  • 6.0

  • 6.96

  • 7.04


16.

For the reaction, 2NO2 2NO + O2, the value of Kp is equal to K. What will the value of Kp for reaction,

NO + 12O2 NO2

  • K

  • 1K

  • 1K

  • 1K2


17.

Which one of the following elements, is a component of a compound essential for photosynthesis ?

  • Iron

  • Calcium

  • Barium

  • Magnesium


18.

The correct order of stability of carbocations, is :

  • 1° < 2° < 3° < CH3

  • C+H3 < 1° < 2° < 3°

  • 3° < 2° < 1° < C+H3

  • 2° < 3° < 1° < C+H3


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19.

The IUPAC name of the following compound is

  • bicyclo [2, 2, 0] octane

  • bicyclo [0, 2, 2] hexane

  • bicyclo [2, 1, 1] hexane

  • bicyclo [2, 2, 0] hexane


20.

The following compound can not exhibit

CH3CH = CH - CH(OH).COOH

  • geometrical isomerism

  • optical isomerism

  • metamerism

  • position isomerism


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