When a covalent bond forms between atoms, electrons are
a. lost.
b. gained.
c. shared.
d. transferred.?

Covalent bonds share electrons while ionic bonds transfer their electrons.

            Molarity  =  1 mol.L⁻¹

Solution:
             Molar concentration (Molarity) is given as,

                        Molarity  =  Moles / Volume of Solution  (1)

Data Given;

                    Moles  =  4 mol

                    Volume  =  4 L

Putting Data in Eq. 1,

                    Molarity  =  4 mol ÷ 4 L

                    Molarity  =  1 mol.L⁻¹