Which one of the following is a good conductor of electricity? f

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 Multiple Choice QuestionsMultiple Choice Questions

51.

In which of the following the inert pair effect is most prominent?

  • C

  • Si

  • Ge

  • Pb


52.

The metal that does not give the borax bead test is

  • Chromium

  • nickel

  • lead

  • manganese


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53.

Which one of the following is a good conductor of electricity?

  • Diamond

  • Graphite

  • Silicon

  • Amorphous carbon


B.

Graphite

Non metal are bad conductor of electricity but graphite is good conductor of electricity because in graphite hybridisation of carbon is sp2. Hence, one electron of each carbon atom is free which is responsible to conduct electricity.


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54.

Which one of the following is maximum electronegative?

  • lead

  • Silicon

  • Carbon

  • Tin


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55.

Buckminster-fullerene is a variety of

  • boron

  • carbon

  • ammonia

  • fluorine


56.

Doping of silicon with boron leads to

  • n-type semiconductor

  • p-type semiconductor

  • superconductor

  • insulator


57.

The substance not likely to contain CaCO3 is

  • marble statue

  • calcined gypsum

  • sea shells

  • dolomite


58.

The electronic configuration of an element C is 1s2, 2s2, 2p6. The formula of substance containing only C will be

  • C8

  • C4

  • C2

  • C


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59.

Number of carbon atoms in kerosene is

  • C17-20

  • C12-16

  • C20-25

  • C25-30


60.

C14 is

  • a natural non-radioactive isotope

  • an artificial non-radioactive isotope

  • an artificial radioactive isotope

  • a natural radioactive isotope


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