The decomposition of $H_2O_2$ can be slowed down by the addition of a small amount of phosphoric acid,which acts as:

Identify the role of glycerol in the following reaction: $2 H_2O_{2(\ell)} \xrightarrow{\text{glycerol}} 2 H_2O_{(\ell)} + O_{2(g)}$

Considering catalysis,which of the following statements is incorrect?

Which of the following parameters is never affected by using a catalyst during a reaction?

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.
Reason : The reactants are most strongly adsorbed on Group $7-9$ elements.

When $KMnO_4$ solution is added to hot oxalic acid solution,the decolourisation is slow in the beginning but becomes instantaneous after sometime. This is because