Assam CEE Rate of Reaction — practice questions

Explore 2 free Rate of Reaction questions in Assam CEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Rate of Reaction questions and exercises with answers

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The SI/CGS-style units of the **rate of a chemical reaction** are:Read the answer and worked solution →For the reaction A → B, the rate of reaction can be written as:Read the answer and worked solution →

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The SI/CGS-style units of the rate of a chemical reaction are:

L mol⁻¹ s⁻¹
mol dm⁻³ s⁻¹
mol L⁻¹
s⁻¹

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Correct answer: B. mol dm⁻³ s⁻¹

Rate = change in concentration / change in time, hence units are concentration/time = mol dm⁻³ s⁻¹ (or mol L⁻¹ s⁻¹).

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For the reaction A → B, the rate of reaction can be written as:

$-d[A]/dt$ only
$+d[B]/dt$ only
$+d[A]/dt = -d[B]/dt$
$-d[A]/dt = +d[B]/dt$

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Correct answer: D. $-d[A]/dt = +d[B]/dt$

A is consumed → rate $= -d[A]/dt$ (negative because [A] decreases). B is formed → rate $= +d[B]/dt$. By stoichiometry (1:1), both are equal.