NEET2026Chemistry-Chemical Reactions and Equations
NEET 2026 Chemistry Stoichiometry MCQ Question
Type: MCQ-numerical-Medium-Class 11
When 1 dm³ of CO₂ gas is passed over hot coke the volume of gaseous mixture after complete reaction at STP becomes 1.4 dm³. The composition of the gaseous mixture at STP is:
A
0.8 dm³ of CO, 0.8 dm³ of CO₂
B
0.8 dm³ of CO, 0.6 dm³ of CO₂
C
0.6 dm³ of CO, 0.8 dm³ of CO₂
D
0.6 dm³ of CO, 0.4 dm³ of CO₂
Correct Answer
Option B
Detailed Explanation
The reaction is CO₂ + C(s) → 2CO. Initially, there is 1 dm³ of CO₂. After reaction,¹⁻ x dm³ of CO₂ and 2x dm³ of CO are formed. Given¹⁻ x + 2x = 1.4, solving gives x = 0.4. Thus, 0.8 dm³ of CO and 0.6 dm³ of CO₂ are present.
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