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21. On increasing the pressure three fold, the rate of reaction of2H2S+ 02> products, would increase [EAMCET)(a) 3 times(b) 9 times(c) 12 times(d) 27 times |
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Answer» Increasing the pressure on a reaction involving reacting gases increases the rate of reaction. Changing the pressure on a reaction which involves only solids or liquids has no effect on the rate. An example In the manufacture of ammonia by the Haber Process, the rate of reaction between the hydrogen and the nitrogen is increased by the use of very high pressures. In fact, the main reason for using high pressures is to improve the percentage of ammonia in the equilibrium mixture, but there is a useful effect on rate of reaction as well. Reaction rate = [H2S]2.[O2] If pressure is increased 3 times then (at same temperature) volume must decrease 3 times as well. So [H2S] and [O2] both increase 3 times. This is because [H2S] and [O2] is inversely proportional to volume. So reaction rate increases 3^2*3 =27 times |
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