1. Tardigrade
  2. Question
  3. Chemistry
  4. For the following Assertion and Reason, the correct option is: Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7 -9 elements. Reacion: The reactants are most strongly adsorbed on group 7 - 9 elements.

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Q. For the following Assertion and Reason, the correct option is :
Assertion : For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7 -9 elements.
Reacion : The reactants are most strongly adsorbed on group 7 - 9 elements.

JEE MainJEE Main 2020The d-and f-Block Elements

Solution:

$H _2 O (\ell) \rightleftharpoons H _{( aq )}^{++} OH -{ }_{( aq )}$
For ionization of $H _2 O : \Delta H >0 \Rightarrow ENDOTHERMIC$
On temperature increase reaction shifts forward
$\Rightarrow$ both $\left[ H ^{+}\right]$and $\left[ OH ^{-}\right]$increase
$\Rightarrow p H \& p O H$ decreases