Get Answers to all your Questions

header-bg qa

The energies of activation for forward and reverse reactions for A_{2}+B_{2}\rightleftharpoons 2AB\; are\; 180\; kJ\; mol^{-1}\; and\; 200\; kJ\; mol^{-1} respectively. The presence of a catalyst lowers the activation energy of both (forward and reverse) reactions by 100\; kJ\; mol^{-1} . The enthalpy change of the reaction (A_{2}+B_{2}\rightarrow 2AB)

in the presence of a catalyst will be  (in\; kJ\; mol^{-1})

  • Option 1)

    20

  • Option 2)

    300

  • Option 3)

    120

  • Option 4)

    280

 

Answers (1)

best_answer

As we learnt in 

Catalyst -

A catalyst is a surface that increases the rate of a chemical reaction without itself being used up. It remains unchanged chemically providing an alternate path for the reaction at an accelerated rate by lowering the activation energy. 

- wherein

 

 Enthalpy change of reaction do not change by adding catalyst.

 

\bigtriangleup H = 200-180 = 20 KJmol^{-1}


Option 1)

20

This option is correct

Option 2)

300

This option is correct

Option 3)

120

This option is incorrect

Option 4)

280

This option is incorrect

Posted by

divya.saini

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE