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The addition of a catalyst during a chemical reaction alters which of the following quantities ?

(A)

Activation energy

(B)

Entropy

(C)

Internal energy

(D)

Enthalpy

NEET - Medical UG-2016 Easy

Answer & Solution:

Activation energy

In a chemical reaction, a catalyst is basically used to alter the reaction rate. In reality, a catalyst will find a new reaction pathway and thus reduces the activation energy.

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Other Questions of the same topic

Q1:

The correct difference between first- and second-order reactions is that

(A)

a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed

(B)

the half-life of a first-order reaction does not depend on [A\(]_{o}\) ; the half-life of a second-order reaction does depend on [\(A]_{o}\)
 

(C)

the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on 
reactant concentrations

(D)

the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations

NEET - Medical UG-2018 Medium

Q2:

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

(A)

is tripled

(B)

is doubled

(C)

is halved

(D)

remains unchanged

NEET - Medical UG-2018 Medium

Q3:

The rate constant of the reaction A \(\large \rightarrow \) B is 0.6 × 10\(\large ^{-3}\) mole per second. If the concentration of A is 5 M, then concentration of B after 20 minutes is :-

(A)

0.36 M

(B)

0.72 M

(C)

1.08 M

(D)

3.60 M

NEET - Medical UG-2015 Medium

Biology Physics

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