A) P and\[Cl\]
B) \[N{{H}_{3}}\]and\[B{{F}_{3}}\]
C) H and \[Ca\]
D) H and \[S\]
Correct Answer: C
Solution :
Key Idea: The electrovalent bond is formed between atoms which have difference in electronegativity more than 1.7. One of the atoms should be electron donor while other should be electron acceptor. (i) P and\[Cl\]and H and S form covalent bond among them because the difference in their electronegativity is less than 1.7. (ii)\[N{{H}_{3}}\]and\[B{{F}_{3}}\]form coordinate bond as N in \[N{{H}_{3}}\]donates electrons to B in\[B{{F}_{3}}\]. (iii) H and\[Ca\]form ionic bond because the difference in their electronegativity is more than 1.7.
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