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Multiple choice·Standard multi-step (3/5)·No calculator

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

According to the solubility graph, a saturated solution at 60∘C60^\circ\text{C} contains 80 g80\,\text{g} salt in 100 g100\,\text{g} water. If it is cooled to 30∘C30^\circ\text{C}, about how much salt crystallises?
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cbse-science-9.u2.t2-2.mc.004

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