What are the products formed when ammonia reacts with excess chlorine?
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.