Which of the following is correctly paired?
Answer & explanation
Correct answer: option 1
The correct answer is option 1. Cyanide ion - CN-.
The correct pairing, "Cyanide ion \(CN^-\)", corresponds to the chemical formula and charge of the cyanide ion.
1. Cyanide Ion \((CN^-)\):
The cyanide ion is a polyatomic ion composed of one carbon (C) atom and one nitrogen (N) atom.
The chemical formula for the cyanide ion is \(CN^-\).
The cyanide ion carries a single negative charge (represented by the - sign).
2. Composition:
The cyanide ion has a triple bond between the carbon and nitrogen atoms, and it is a strong Lewis base.
The lone pair of electrons on the nitrogen atom makes the cyanide ion a potent ligand in coordination chemistry.
3. Comparison with Other Options:
Ammonia has the chemical formula \(NH_3\), and it is a neutral molecule. It does not have an \(OH^-\) ion. Bromide ion has the chemical formula \(Br^-\), and fluoride ion has the chemical formula \(F^-\). The charges and compositions in these pairs are not correct.
In summary, the correct pairing is "Cyanide ion \(CN^-\)", as it accurately represents the chemical formula and charge of the cyanide ion.