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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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