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Q.

(A) : Diamond is covalent, yet it has highest melting point and boiling point.

(R) : Diamond has three dimensional polymetric structure with strong C-C bonds

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a

A and R are true, R explains A

b

A and R are true, R does not explain A

c

A is true, but R is false

d

A is false, but R is true

answer is A.

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Detailed Solution

Due to these strong covalent bonds and a 3D- network solid ,hence  diamond is the hardest substance having abnormally high melting point and boiling point. 

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(A) : Diamond is covalent, yet it has highest melting point and boiling point.(R) : Diamond has three dimensional polymetric structure with strong C-C bonds