Graphite is a from Chemistry NEET Year 2012 Free Solved Previous

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Graphite is a

  • molecular solid

  • covalent solid

  • ionic solid

  • metallic solid


D.

metallic solid

In graphite, the constituent particles are atoms and intermolecular force is covalent bonding. Thus, it is an example of covalent solid.


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12.

Which one of the following transition metal ions is diamagnetic?

  • Co2+

  • Ni2+

  • Cu2+

  • Zn2+


13.

The ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is

  • 12

  • 13

  • 49

  • 275


14.

Acetic anhydride is prepared in the laboratory by heating sodium acetate with

  • ethyl chloride

  • acetyl chloride

  • conc. H2SO4

  • zinc dust


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15.

For the reaction,

NH3 + OCl-  N2H4 + Cl-

occurring in basic medium, the coefficient of N2H4 in the balanced equation will be

  • 1

  • 2

  • 3

  • 4


16.

The IUPAC name of acryldehdye is

  • prop-2-en-l-al

  • propenylaldehyde

  • but-2-en-l-al

  • propenal


17.

The structures of (CH3)3CBr and CH3[CH2]3 Br represent

  • chain isomerism

  • position isomerism

  • chain as well as position isomerism

  • functional isomerism


18.

Petrol for aviation purpose must contain

  • straight chain hydrocarbons

  • aromatic hydrocabrons

  • olefinic hydrocarbons

  • highly branched chain paraffins


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19.

The solubility product of Hg2l2 is equal to

  • Hg22+I-

  • [Hg2+][I-]

  • Hg22+I-2

  • [Hg2+][I-]2


20.

Moist hydrogen peroxide can not be dried over conc. H2SO4 because

  • it can catch fire

  • it is reduced by H2SO4

  • it is oxidised by H2SO4

  • it is decomposed by H2SO4


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