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    NITROGEN MONOOXIDE

    STABILITY : MOST STABLE AMONG ALL THE OXIDES

    COLUOR : COLOURLESS GAS

    OXIDATION STATE OF N ATOM : 2 +

    SOLUBILITY : SPARRINGLY SOLUBLEWATER;PRODUCE NEUTRAL SOLUTION

    WHEN IT CAN BE PRODUCED ?? PRODUCED WHEN NITROGEN AND

    OXYGEN IS HEATED STRONGLY

    REASON : - ENTHALPHY OF ATOMISATION OF NITROGEN IS VERY HIGH

    - A VERY HIGH HEAT ENERGY IS REQUIRED TO BREAK THE

    BOND

    - THUS NO (g) CAN BE PRODUCED UNDER HIGH TEMP ONLY

    EQUATION OF FORMATION OF NO(g)

    WHY IS THE PROCESS EXORTHERMIC ??

    REASON : - IT IS DUE TO HIGH ENTHALPHY OF ATOMISATION OF

    NITROGEN

    STRUCTURE OF NO

    i. CONTAINS DOUDLE BOND

    ii. PARAMAGNETIC DUE TO ONE UNPAIRED ELECTRON

    WHAT REACTION CAN PRODUCE NO(g) ??

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    i. LIGHTING

    ii. COMBUSTION

    i. ELECTRIC GENERATORS

    NITROGEN DIOOXIDE

    BROWN TOXIC GAS

    DISSOLVES IN WATER TO FORN NITROUS AND NITRIC ACID

    STRONG OXIDISING AGENT

    EVIDENCE1. REACTION WITH SULPHUR

    SULPHUR IS OXIDISED TO SULPHUR DIOXIDE

    NITROGEN DIOXIDE IS REDUCED TO NITROGEN

    2. REACTION WITH HYDROGEN SULPHIDE

    HYDROGEN SULPHIDE OXIDISES TO SULPHER

    NITROGEN DIOXIDE IS REDUCED TO NITROGEN

    MONOOXIDE

    STRUCTURE OF NO2

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    1. LOW TEMPERATURE2. HIGH PRESSURE

    EXPLANATION FOR LOW TEMPERATURE

    FORWARD REACTION IS EXORTHERMIC REDUCING TEMP WILL INCREASE KP THIS CAUSES THE EQUILIBRIUM COMPOSITON TO RIGHT THUS MORE DINITROGEN TETRE OXIDE IS PRODUCED TO COUNTER BALANCE THE REDUCE

    IN TEMPERATURE

    EXPLANATION FOR INCREASE IN PRESSURE

    TOTAL NO OF MOLES OF REACTANTS IS HIGHER THAN PRODUCTS EQUILIBRIUM WILL SHIFT TO RIGHT TO RESSIST THE CHANGE IN PRESSURE MORE DINITROGEN TETRA OXIDE WILL BE PRODUCED

    STRUCTURE OF DIMER

    ACHIEVES OCTET STATE

    NO UNPAIRED ELECTRONS

    DI MAGNETIC

    DINITROGEN TETRAOXIDE

    COLOURLESS GAS AT ROOM TEMP AND BELOW

    NON- POLAR

    EXIST AS 3 RESONANCE STRUCTURE

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    DECOMPOSITION

    READILIY DECOMPOSES TO NITROGEN DIOXIDE

    REASON : - BOTH NITROGEN ATOMS CARRIES PARTIAL (+ VE) CAHARGE- HENCE THE NITROGEN ATOMS REPELS EACH OTHER

    - THE N-N BOND IS WEAKEN DUE TO THIS.

    AIR POLLUTIONS BY OXIDES OF NITROGEN

    OXIDES OF NITROGEN ARE NOT THE RESULTS OF COMBUSTION FUEL

    &THEN WHAT CAUSES OXIDS OF NITROGEN FORMED IN PETROL ENGINE

    ?????ELECTRICAL GENERATOR

    INITIALLY THE OXIDES OF NITROGEN PRODUCED IS NITROGEN MONOOXIDE

    THIS GAS RAPIDLY CONVERTED INTO NITROGEN DIOXIDE BY FUTHER

    .REACTING WITH OXYGEN IN SURROUNDING AIR

    OXIDES OF NITROGEN HAVE ABILITY TO FORM FREE RADICAL BY

    PHOTOCHEMICAL PROCESS

    RELATIONSHIP BETWEEN NO, NO2, N2O4

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    CATALYTIC CONVERTER

    AN ANTI POLLUTION DEVICE LOCATED IN EXHAUST SYSTEM OF MODERN VEHICLES MADE UP OF METAL CATALYST PLATINUM-RHODIUM ON CERAMIC MATRIX REDUSES OXIDES OF NITROGEN INTO NITROGEN CATALYSES OXIDATION OF CABON MONOOXIDE AND UNBURNED HYDROCARBONS INTO

    CARBON DIOXIDE THE CATAYST IS ONLY EFFECTIVE WHEN TEMPERARURE EXCEEDS 400 *C THUS MOST OF THE TIME CONVETER IS IN ACTIVE BECAUSE IT DOES NOT REACH THE

    OPERATING TEMPERATURE CARS FITTED CATALYTIC CONVERTERS LEADED PETROL THIS IS BECAUSE LEADED COMPOUND COAT ON SURFACE OF CATALYST

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