A bond in which an electron pair is unequally shared by two atoms is:

Polar covalent bond

Explanation: Electron sharing is usually attributed to covalent bonding as different from the actual transfer of electron from one atom to another which is a feature of Electrovalent bonding of atoms. In covalent bond, unstable pair of atoms share electron in other to reach their octet state. However, a Polar covalent bond occurs when the shared pair of electrons is unequal below between the sharing atom with one atom having a greater pull on the electron than the other. A common example of Polar covalent bond is the bonding between hydrogen and oxygen in the formation of water molecule (H2O) with

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