STANDARDChemistry-Stoichiometry
STANDARD Chemistry Limiting Reagents MCQ Question
Type: MCQ-numerical-Medium
1 g of Mg is burnt in a closed vessel containing 0.5 g of O₂. Which reactant is limiting reagent and how much of the excess reactant will be left?
A
O₂ is a limiting reagent and Mg is in excess by 0.25 g.
B
Mg is a limiting reagent and O₂ is in excess by 0.5 g.
C
O₂ is limiting reagent and Mg is in excess by 0.05 g.
D
O₂ is a limiting reagent and Mg is in excess by 0.75 g.
Correct Answer
Option A
Detailed Explanation
The reaction is 2Mg + O₂ → 2MgO. 1 g of Mg requires 0.66 g of O₂, but only 0.5 g is available, making O₂ the limiting reagent. The excess Mg is 0.25 g.
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