OXIDES AND OXOANIONS OF SULPHUR and NITROGEN Dr. S.B.Misal - PowerPoint Presentation

OXIDES AND OXOANIONS OF SULPHUR and NITROGEN Dr. S.B.Misal S.M.Joshi College, Hadapsar , Pune-28

Oxides of Sulphur Sulfur oxides( SOx ) are the compounds of sulfur and oxygen molecules.Sulfur has a rich chemistry with oxygen. Sulfur forms strong double bonds to oxygen.Oxides with sulfur in low oxidation states occur.

Sulfur dioxide Sulfur trioxide Sulfuric acid

Oxoanions of SulfurOxoanion : Sulphite (SO3)2-Sulphate(SO4)2-Thiosulphite(S2O3)2-

Sulfate ion Oxd n state of sulfur : +6Oxdn state of each oxygen : -2Tetrahedral molecular shapeThe symmetry is the same as that of methane. The sulfate ion carries a negative two charge and is the  conjugate base  of the  bisulfate  (or hydrogen sulfate) ion, HSO−4 , which is the conjugate base of  H2SO4 The  tetrahedral molecular geometry  of the sulfate ion is as predicted by VSEPR theory

Sulphite ion Trigonal pyramidal shape (like ammonia)The sulfur atom is double-bonded to one oxygen atom with a formal charge of zero (neutral), and sulfur is singly bonded to the other two oxygen atoms, which each carry a formal charge of −1, together accounting for the −2 charge on the anion.

Thiosulfate   Tetrahedral molecular shapeOxdn state +2The prefix thio- indicates that the thiosulfate ion is a sulfate ion with one oxygen replaced by sulfur.

Dithionite reducing agent The dithionite anion ([S2O4]2−), is an oxoanion of sulfur [1] formally derived from dithionous acid, H2S2O4. Oxd n state +3

Dithionate Oxidation state of sulfur is +5 Resist oxdn and rednStrong oxidants oxidise them to sulfates and strong reducing agents reduce them to sulfites and dithionites

OXIDES & OXOANIONS OF NITROGEN NAME : YELE POOJA RAMDAS CLASS : M.Sc (1)SUBJECT : INORGANIC CHEMISTRY

Nitric oxide ,NO When exposed to oxygen , ·NO is converted into nitrogen dioxide. 2 ·NO + O2 → 2 NO 2 This conversion has been speculated as occurring via the ONOONO intermediate. In water, ·NO reacts with oxygen and water to form HNO 2 or nitrous acid . The reaction is thought to proceed via the following stoichiometry : 4 ·NO + O 2 + 2 H 2 O → 4 HNO 2

Nitrogen dioxide NO 2 Nitrogen dioxide is the chemical compound with the formula NO2. It is one of several nitrogen oxides. NO2 is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year. At higher temperatures it is a reddish-brown gas that has a characteristic sharp, biting odor and is a prominent air pollutant.[7] Nitrogen dioxide is a paramagnetic, bent molecule with C2v point group symmetry.

Nitrous oxide,N 2 O Nitrous oxide, commonly known as laughing gas, nitrous, nitro, or NOS [1] is a chemical compound with the formula N2O. It is an oxide of nitrogen. At room temperature, it is a colorless, non-flammable gas, with a slightly sweet odor and taste. It is used in surgery and dentistry for its anaesthetic and analgesic effects. It is known as "laughing gas" due to the euphoric effects of inhaling it, a property that has led to its recreational use as a dissociative anaesthetic. It is also used as an oxidizer in rocket propellants , and in motor racing to increase the power output of engines. At elevated temperatures, nitrous oxide is a powerful oxidizer similar to molecular oxygen.

Dinitrogen trioxide N 2 O3Dinitrogen trioxide is the chemical compound with the formula N2 O 3 . This deep blue solid [1] is one of the binary nitrogen oxides . It forms upon mixing equal parts of nitric oxide and nitrogen dioxide and cooling the mixture below −21 °C (−6 °F): [2] NO + NO 2 ⇌ N 2 O 3

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