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Question
By drawing an electron dot diagram, show the lone pair effect leading to the formation of ammonium ion from ammonia gas and hydrogen ion.
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Solution
NH3 has one lone pair of electrons which is donates to 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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RELATED QUESTIONS
Choose the most appropriate answer of the following:
Bonding in this molecule can be understood to involve coordinate bonding
(A) Carbon tetrachloride
(B) Hydrogen
(C) Hydrogen chloride
(D) Ammonium chloride
Identify the anion present in the following compounds:
A salt M on treatment with concentrated sulphuric acid produces a gas which fumes in moist air and gives dense fumes with ammonia
The following table shows the test a student performed on four different aqueous solutions which are X, Y, Z and W. Based on the observations provided, identify the cation present:
| Chemical test | Observation | Conclusion |
| To solution X, ammonium hydroxide is added in minimum quantity first and then in excess |
A dirty white precipitate is formed which dissolves in excess to form a clear solution |
(1) |
| To solution Y ammonium hydroxide is added in the minimum quantity first and then in excess |
A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution. |
(2) |
| To solution W a small quantity of sodium hydroxide solution is added and then in excess. |
A white precipitate is formed which remains insoluble. |
(3) |
| To a salt Z calcium hydroxide the solution is added and then heated. |
A pungent smelling gas turning moist red litmus paper blue is obtained. |
(4) |
Give two example in the following case:
Co-ordinate bond compounds
Why do atoms combine?
Fill in the blank
Coordinate bond is also called __________bond.
Fill in the blanks
A coordinate bond is represented by an arrow pointing from ________ to__________ atom.
What is the term defined below?
A bond formed by a shared pair of electrons with both electrons coming from the same atom.
Bonding in this molecule can be understood to involve coordinate bonding.
What are the term defined below?
A bond formed by a shared pair of electrons with both electrons coming from the same atom.
