Question

Which of the following combination will form an electrovalent bond?

• A. P and $Cl$
• B. $N{H}_3$ and $B{F}_3$
• C. H and $Ca$
• D. H and $S$

Answer 1

Answer: (C)

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.