The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
Correct answer: (iii) C and D will produce a covalent bond.
Explanation: The elements C and D belong to group 14 and group 17, respectively which are nonmetals. When two nonmetals combine, sharing of electrons takes place, which results in the formation of a covalent bond.
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