The substance not likely to contain CaCO3 is from Chemistry The

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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


53.

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

  • Diamond

  • Graphite

  • Silicon

  • Amorphous carbon


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


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57.

The substance not likely to contain CaCO3 is

  • marble statue

  • calcined gypsum

  • sea shells

  • dolomite


B.

calcined gypsum

Gypsum is a very soft sulphate mineral composed of calcium sulphate dihydrate, with the chemical formula CaSO4.2H2O.

On heating, gypsum loses water and gives the hemihydrate (CaSO4.12H2O) or the anhydrite.

2CaSO4.2H2OGypsum 120°C (CuSO4)2.H2O + 3H2OPlaster of Paris

The hemihydrate is known as calcined gypsum or plaster of paris.


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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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