ox on
TRANSCRIPT
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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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