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What is a salt bond?

  1. A strong ionic bond

  2. A weak physical bond between polypeptide chains

  3. A covalent bond

  4. A metallic bond

The correct answer is: A weak physical bond between polypeptide chains

A salt bond is a type of intermolecular force that occurs between charged groups in different molecules. It is weaker than ionic bonds, which occur between charged atoms within the same molecule, and covalent bonds, which involve the sharing of electrons. Metallic bonds also involve the sharing of electrons, but they occur between atoms of metal elements, while salt bonds can occur between any two molecules with charged groups.