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Q.

Which of the following combination will form an electrovalent bond ?

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a

NH3 and BF3

b

H and S

c

H and Ca

d

P and Cl

answer is C.

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Detailed Solution

  • The electrovalent bond is formed between atoms, which have a difference in electronegativity more than 1.7. 
  • One of the atoms should be electron donor while other should be electron acceptor.
  • P and Cl and H and S form covalent bond among them because the difference in their electronegativity is less than 1.7.
  • NH3​ and BF3​ form co-ordinate bond as N in NH3​ donates electrons to B in BF3​.
  • H and Ca form ionic bond between them because, their difference in electronegativity is more than 1.7.
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