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Multiple choice·Standard multi-step (3/5)·Calculator allowed

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

On heating 25.0 g25.0\text{ g} of limestone containing 80.0%80.0\% pure CaCO3\mathrm{CaCO_3}, the volume of CO2\mathrm{CO_2} evolved at STP is CaCO3→CaO+CO2\mathrm{CaCO_3\rightarrow CaO+CO_2}.
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cbse-chemistry-11.u1.t1-4.mc.002

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