Important reducing agents-
(i) All metals e.g. Na, Zn, Fe, Al, etc.
(ii) A few non-metals e.g. C, H2, S etc.
(iii) Hydracids: HCl, HBr, HI, H2S etc.
(iv) A few compounds containing an element in the lower oxidation state (ous), e.g. FeCl2, FeSO4, SnCl2, Hg2Cl2, Cu2O etc.
(v) Metallic hydrides e.g. NaH, LiH etc.
(vi) Organic compounds like HCOOH and (COOH)2 and their salts, aldehydes, alkanes etc.
(vii) Lithium is the strongest reducing agent in solution.
(viii) Cesium is the strongest reducing agent in absence of water. Other reducing agents are Na2S2O3 and KI.
