Which one of the following will form an electrovalent bond ?

1) P and Cl 3) H and Ca 4) H and S

2) NH₃ and BF₃

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Solution

The answer will be option 3.(H and CA)

Higher the difference in electronegativity between the two atoms, more will be electrovalent character of the bond.Among given choices,Hydrogen and Calcium have maximum differences in their electronegativities.

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