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51.

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

52.

The metal that does not give the borax bead test is

53.

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

54.

Which one of the following is maximum electronegative?

55.

Buckminster-fullerene is a variety of

56.

Doping of silicon with boron leads to

57.

The substance not likely to contain CaCO₃ is

58.

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

59.

Number of carbon atoms in kerosene is

a natural radioactive isotope

Carbon has three important isotopes C¹², C¹³ and C¹⁴. C¹⁴ is formed is traces in the atmosphere by cosmic bombardment of nitrogen.

₇N¹⁴ + ₀n¹ → ₆C¹⁴ + ₁H¹

C¹⁴ is a natural radioactive isotope.