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CBSE 11 Chemistry
Lab
Item 3

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

During crystallisation of impure copper sulphate, the correct reason for filtering the hot saturated solution before cooling is that

Choose an answer

A.cooling before filtration increases crystal size

B.hot filtration removes insoluble impurity before crystals separate

C.cooling first removes soluble impurity more completely

D.filtration converts copper sulphate into anhydrous salt

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