What is the angle between the carbon-oxygen and carbon-nitrpgen bond in cyanate ion

180 degrees.

Each cyanate ion contains one carbon atom, one oxygen atom, and one nitrogen atom. The ion carries a charge of negative one.

The ion would demand extra electrons to ensure a complete octet for each of its atom. It would do so by forming covalent bonds.

There are two possible configurations:

Either way, the central carbon atom would end up with two electron domains and no lone pairs. By the VSEPR theory, the molecule would end up with a linear geometry. It would thus have an O-C-N bond angle of 180 degrees.

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