Question

$i\left)2H_2{O}_2\stackrel{}{\underset{\mathrm{Pt}}{\to }2H_{2}O+O_2}\mathrm{ii}\right)2H_2{O}_2\stackrel{}{\underset{\mathrm{Glycerol}}{\to }2H_2}O+O_2$
What is the role of $Pt$ and glycerol in the above reaction?

• A. Both act as negative catalysts
• B. Both act as positive catalysts
• C. $Pt$ acts as a negative catalyst and glycerol acts as a positive catalyst
• D. $Pt$ acts as a positive catalyst and glycerol acts as a negative catalyst

Answer 1

The correct option is D $Pt$ acts as a positive catalyst and glycerol acts as a negative catalyst

In reaction i), platinum acts as a catalyst and accelerates the decomposition of hydrogen peroxide, so it is a positive catalyst.
In reaction ii), the decomposition of hydrogen peroxide is suppressed by adding glycerol to the solution. Here glycerol acts as a negative catalyst.