Practicing Success

Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Chemical Kinetics

Question:

Match List I with List II

List I List II
(A) Zero order reaction (I) \(s^{-1}\)
(B) First order reaction (II) \(mol^{-2}\, \ L^2 s^{-1}\)
(C) Second order reaction (III) \(mol\, \ L^{-1}s^{-1}\)
(D) Third order reaction (IV) \(mol^{-1}\, \ L s^{-1}\)

Choose the correct answer from the options given below:

Options:

A-III, B-II, C-I, D-IV

A-III, B-I, C-IV, D-II

A-II, B-III, C-IV, D-I

A-II, B-IV, C-III, D-I

Correct Answer:

A-III, B-I, C-IV, D-II

Explanation:

The correct answer is option 2. A-III, B-I, C-IV, D-II.

For a general reaction

\[aA + bB \longrightarrow cC + dD\]

Rate \(= [A]^x[B]^y\)

Where, \(x + y = n = \text{order of the reaction}\)

\[k = \frac{Rate}{[A]^x[B]^y}\]

\[k = \frac{concentration}{time} × \frac{1}{(concentration)^n}\]

\[or, \, \ k = (concentration)^{1 - n}time^{-1}\]

Taking SI units of concentration, \(mol\, \ L^{-1}\) and time, \(s\), the units of \(k\) for different reaction orders are

Order of Reaction Units of Rate constant (k)
Zero \((n = 0)\) \(mol\, \ L^{-1}s^{-1}\)
First \((n = 1)\) \(s^{-1}\)
Second \((n = 2)\) \(mol^{-1}\, \ L s^{-1}\)
Third \((n = 3)\) \(mol^{-2}\, \ L^2 s^{-1}\)

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