Coordinate bond is present in:A) Hydronium ionB) WaterC) Sulphur dioxideD) Ammonia

A coordinate bond, also known as a dative bond or a coordinate covalent bond, is formed when one atom donates a pair of electrons to another atom to form a covalent bond. In this type of bond, both electrons in the bond come from one of the atoms involved.

Among the options you've provided:

A) Hydronium ion (H3O+): It contains a coordinate bond between the oxygen atom and the hydrogen atom that has donated its electron pair. So, there is a coordinate bond in hydronium ion.

B) Water (H2O): Water also contains covalent bonds, but they are not coordinate bonds. The oxygen-hydrogen bonds in water are typical covalent bonds.

C) Sulphur dioxide (SO2): Sulphur dioxide contains covalent bonds, but it also has a coordinate bond between the sulfur atom and one of the oxygen atoms.

D) Ammonia (NH3): Ammonia contains covalent bonds, but there are no coordinate bonds in ammonia.

So, coordinate bonds are present in options A, C, and not in B or D.