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# Consider the reaction $2H_2O_2(aq)\rightarrow 2H_2O(l)+O_2(g)$ wen 1g of KI is added to $H_2O_2$,bubbles of $O_2$ are produced at an increased rate.When reaction is complete,mass of KI is 1g.The KI is a

$\begin{array}{1 1}(a)\;product\\(b)\;reactant\\(c)\;catalyst\\(d)\;reaction\;intermediate\end{array}$

Catalyst is substance which just increases rate of reaction by decreasing activation energy without being consumed in reaction.
Mass of KI before and after reaction is same (i.e) 1 gram.
So it is catalyst.
Hence (c) is the correct answer.