Classify the following reactions into combination, dis-
placement, decomposition and double displacement.
(a) NH4Cl → NH3 + HCl
(b) 2NO + O2 → 2NO2
(c) ZnCO3 → ZnO + CO2
(d) Ag2SO4 + 2Fe + 2Ag + Fe2(SO4)3
(e) 2NH3 + N2 + 3H2
(f) AgNO3 + HCl → AgCl + HNO3
(g) 2502 + O2 → 2SO3
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