1.

A reacation takes place in three steps with actiation energy E_(a_(1))=180 KJ/mol , E_(a_(2)) =80 KJ/mol , E_(a_(3))=50 KJ/mol respectively overall rate constant of the reaction is k=[(k_(1)k_(2))/(k_(3))]^(2//3) the overallactivation energy of reaction will be (Here k_(1),k_(2) a"and k_(3) are rate constant of first, second and third step respectively.):

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140 KJ/mol
150 KJ/mol
43.44 KJ/mol
100 KJ/mol

Answer :A


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