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Free Online Mock Chemistry Multiple Choice Test on Chemical Kinetics
Sub Category : Chemical Kinetics Test : 3 Time Left :
1) The reactions 2NO + O2 to 2NO2 2CO + O2 to 2CO2 Look to be identical, yet the first is faster than the second. The reason is that(1) The first reaction has lower enthaply (2) The first reaction has lower internal energy change than the second (3) The first reaction has lower activation energy than the second (4) Nitric oxide is less stable than carbon monoxide
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2)Rate of a reaction
(1) increases with increases in temperature (2) decreases with increases in temperature (3) does not depend upon temperature (4) does not depend upon concentration
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3)Under a given set of experimental conditions, with increase of concentration of the reactants, the rate of a chemical reaction
(1) always decreases (2) always increases (3) first decreases, then increases (4) none of these
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4) If the reaction rate at a given temperature becomes slower. it means
(1) free energy of activation is higher (2) free energy of activation is lower (3) entrophy changes (4) initial concentration of reactants remain constant
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5)Pieces of wood burn faster than a log of wood of the same mass because
(1) surface area of log of wood is larger and needs more time or burn (2) pieces of wood have larger (3) all pieces of wood catch fire at the same time (4) block of wood has higher density than pieces of the same wood
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