What is a covalent bond? What type of bond exists in (i) CCl₄, and (ii) CaCl₂?

(i) A molecule containing a single covalent bond

(ii) A molecule containing a double covalent bond

(iii) A molecule containing a triple covalent bond

(iv) A compound containing an ionic bond

(i) Two atoms of the same element combine to form a molecule. The bond between them is known as .......... bond.

(ii) Two chlorine atoms combine to form a molecule. The bond between them is known as ..........

(iii) In forming oxygen molecule, .......... electrons are shared by each atom of oxygen.

(iv) In forming N₂ molecule, .......... electrons are shared by each atom of nitrogen.

(v) The number of single covalent bonds in C₂H₂ molecule are ...............

(vi) Melting points and boiling points of ionic compounds are generally ........than those of covalent compounds.