Which bond(s) is/are ionic-bond?
I. $H - C l (g)$
II. $S - C l (g)$
III. $C s - F (s)$

I only

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III only

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I and II only

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II and III only

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I, II and III

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Solution

The correct option is A III only
III. Cs−F(s) bond is ionic-bond
On the other hand I. H−Cl(g) and II. S−Cl(g) are covalent bonds.
Highly electropositive Cs atom forms an ionic bond with highly electronegative F atom. An ionic bond is formed between atoms having significant electronegativity difference. When electronegativity difference is small, a covalent bond is formed.

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