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The p-Block Elements

Multiple Choice Questions

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

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

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

The electronic configuration 1s² 2s² 2p⁶ belongs to noble gas neon. All the noble gases are monoatomic in nature because they have complete valence shell and stable electronic configuration (ns²np⁶) and so they are chemically inert and do not enter in chemical combination.

C = Ne₍₁₀₎ = 1s² 2s² 2p⁶