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Questions
By drawing an electron dot diagram, show the lone pair effect leading to the formation of the ammonium ion from ammonia gas and hydrogen ion.
Draw an electron dot diagram that shows the lone pair effect for the formation of - \[\ce{NH^+4}\] ion from NH3 gas and H+.
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Solution

NH3 has one lone pair of electrons which is donated to the hydrogen atom, forming a co-ordinate bond. The arrow represents a co-ordinate bond. The arrow points from donor to acceptor atom.
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