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Melting point is the higher for

Melting point is the higher for

Options

(a) Ga
(b) B
(c) In
(d) Al

Correct Answer:

B

Explanation:

In the boron family the melting point decreases on moving down the group upto Ga. However it is not regular.The melting point of B,Al,Ga and In are 2300, 659,29.8 and 156.4⁰C, respectively.
The high melting point of boron is due to the fact that it exists as a giant covalent polymer in both solid and liquid state.

AFMC1994
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