Q.

Statement I : A reactant that is entirely consumed when a reaction goes to completion is known as limiting reactant.

Statement II : The amount of limiting reactant limts the amount of product formed.

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a

Statement I is incorrect and statement II is correct

b

Statement I and II are correct and II does not explain I

c

Statement I and II are correct and II explains I

d

Statement I is correct and statement II is incorrect

answer is B.

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Detailed Solution

The reactant which is completely consumed during the reaction is a limiting reagent

Ex :- 2Mg + O2 β†’ 2MgO

Suppose '48g' each of Mg and O2 are taken

\large \mathop {\mathop {2Mg}\limits_{(2 \times 24g)} }\limits_{48g} + \mathop {\mathop {{O_2}}\limits_{32g} }\limits_{\small{\left. {\begin{array}{*{20}{c}} {32g} \\ {48g} \end{array}} \right\}16g\;excess}} \to \mathop {\mathop {2MgO}\limits_{2 \times 40g} }\limits_{(2 \times 40g)} \

48g of Mg require only 32g of O2 but 48g of O2 is taken.

Mg is the limiting reagent and O2 the excess reagent. The amount of MgO formed depends on the amount of the reactant which completely reacted. (amount of limiting reactant).

Statement I and Statement II are true

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Statement I : A reactant that is entirely consumed when a reaction goes to completion is known as limiting reactant. Statement II : The amount of limiting reactant limts the amount of product formed.