A catalyst is a substance which [NCERT 1981; CPMT 1996
Alters the equilibrium in a reaction
Is always in the same phase as the reactants
Participates in the reaction and provides easier pathway for the same
Does not participate in the reaction but speeds it up
A catalyst does not take part in the reaction but can speed it up. It can be recovered after the reaction.
A catalyst is used [CPMT 1989]
A catalyst is a substance [IIT 1983]