How does a catalyst work?

It lowers the activation energy of a reaction.

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It raises the activation energy of a reaction.

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It changes a reaction from endothermic to exothermic.

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It changes a reaction from exothermic to endothermic.

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It makes a reaction not need activation energy.

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Solution

The correct option is A It lowers the activation energy of a reaction.

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Similar questions

Mark the incorrect statements.
(a)Catalyst provides an alternative pathway to reaction mechanism
(b)Catalyst raises the activation energy
(c)Catalyst lowers the activation energy
(d)Catalyst alters enthalpy change of the reaction

Q. The diagram above shows how the potential energy changes as reactants are converted to products for a given reaction. From the diagram, it can be concluded that the
(1) overall reaction is endothermic
(2) activation energy of the forward reaction is greater than that for the reverse reaction
(3) forward reaction is a more rapid reaction than the reverse reaction

	Column I		Column II
a.	the amount of energy which must be invested in reaction to get it started	p.	chemical equilibrium
b.	a state in which the rate of forward reaction is exactly equal to the rate of the reverse reaction.	q.	activation energy
c.	a process or reaction which consumes heat	r.	endothermic
d.	a process or reaction that releases heat.	s.	exothermic
		t.	threshold energy

Q. If the reactants are at a higher energy level than products, the reaction is exothermic. The activation energy of a forward reaction is less than that of the backward reaction. That means, the energy required for breaking of bonds is less than the energy released during formation of bonds. In case of an endothermic reaction, the activation energy of the forward reaction is more than that of backward reaction.

The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction assuming that it does not change with temperature.

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