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Addition of catalyst to reaction increases the rate because it

$\begin{array}{1 1}(a)\;\text{decrease the value of }\Delta H\\(b)\;\text{increase the value of }\Delta H\\(c)\;\text{provides on alternate reaction mechanism with a lower activation energy}\\(d)\;\text{changes the concentration of reactants}\end{array}$

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Catalyst provide an alternate pathway for reaction to complete with lower activation energy without affecting enthalpy or concentration of reactants.
Hence (c) is the correct answer.
answered Dec 18, 2013 by sreemathi.v

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