Ammonia reacts with excess of chlorine to form:
NH4Cl + NaNO2→ ____ + ____
(a) What type of bond is formed between two atoms, when the difference in electronegativity between them is (i) high, (ii) low, (iii) zero? (b) Separate the following compounds into three categories- ionic, polar and covalent compounds; N2, NH4Cl, NH3, NO, NH4NO3, NCl3.