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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

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. $\frac{1}{2}$ H₂O) or the anhydrite.

$\underset{Gypsum}{2 {CaSO}_{4} . 2 H_{2} O} \overset{120 ° C}{\to} \underset{Plaster of Paris}{({CuSO}_{4})_{2} . H_{2} O + 3 H_{2} O}$

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

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

60.

C¹⁴ is