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ICSE Class 10 Answered

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Coordinate bonds can be formed by Ammonia but not by ammonium ion.Pls let me know thanks.

Asked by rashikulkarni28 | 18 Jul, 2022, 10:33: PM
Expert Answer
Dear Student,
 
The bond formed between two atoms by sharing a pair of electrons provided entirely by one of the
combining atoms but shared by both is called a coordinate bond or dative bond.
Examples: Ammonium ion (NH4+), hydronium ion 
 
In ammonia, the N atom contains a lone pair of electrons after completing its octet. 
 The hydrogen ion accepts the lone pair of electrons of the nitrogen atom of ammonia molecule, leading to the formation of a coordinate bond which gives ammonium ion NH4+.
In case of ammonium ion, there is no lone pair of electron on nitorgen atom as the only lone pair on nitrogen is already used by fourth hydrogen atom to form ammonium ion from ammonia. Hence, ammonium ion can not form coordinate bond.
Answered by | 19 Jul, 2022, 02:45: PM
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