Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Pure silicon doped with phosphorus is a 

  • metallic conductor

  • insulator

  • n-type semiconductor

  • p-type semiconductor


22.

Dry ice is

  • solid CO2

  • solid camphor

  • solid SO2

  • solid NO2


23.

Stereisomers differ in

  • configuration

  • conformation

  • they do not differ

  • none of the above


24.

IUPAC name of the following compound

  • N, N- dimethylcyclopropane carboxamide

  • N-methylcyclopropanamide

  • cyclopropionamide

  • None of the above


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25.

The product of following reaction is

2CH3MgBr + CH2

  • CH3OH

  • C2H5OH

  • CH4

  • C2H6


26.

Sodium formate on heating gives

  • oxalic acid and H2

  • sodium oxalate and H2

  • sodium oxalate

  • CO2 and caustic soda


27.

Which does not give a precipitate with AgNO3 solution?

  • [Co(NH3)6]Cl3

  • [Co(NH3)5Cl]Cl2

  • [Co(NH3)4Cl2]Cl

  • [Co(NH3)3Cl3]


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28.

Total volume of atoms present in a face centred cubic unit cell of a metal is (r is atomic radius)

  • 163 πr3

  • 203πr3

  • 243πr3

  • 123πr3


A.

163 πr3

In fcc unit cell z = 4

Hence, occupied volume by sphere = 4 x 43πr3

                                                   = 163πr3


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29.

Gold number is associated with

  • amount of gold

  • protective colloids

  • purple of cassius

  • electrophoresis


30.

Noble gases are used in discharge tubes to give different colours. Reddish-orange glow is due to

  • Ar

  • Ne

  • Xe

  • Kr


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