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The graph above demonstrate the effect of
surface area on the rate of reaction
catalyst on the rate of reaction
pressure on the rate reaction
concentration on the rate of reaction
In the preparation of oxygen by heating KClO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by
lowering the pressure of the reaction
increasing the surface area of the reactant
increase the rate of the reaction
lowering the energy barrier of the reaction
If a reaction is exothermic and there is a great disorder, it means that
the reaction is static
the reaction is in a state of equilibrium
there will be a large increase in free energy
there will be a large decrease in free energy
In which of the following is the entropy change positive?
Thermal dissociation of ammonium chloride
Reaction between an acid and a base
Addition of concentrated acid to water
Dissolution of sodium metal in water
What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s?
[Al = 27, F = 96500 C mol-1]
0.2 g
1.8 g
5.4 g
14.2 g
