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Long answer·Hard exam skill (4/5)·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

A hot metal of mass 100 g100\text{ g} at 90∘C90^\circ\mathrm{C} is placed in 100 g100\text{ g} water at 30∘C30^\circ\mathrm{C}. The final temperature is 35∘C35^\circ\mathrm{C}. Take water specific heat as 4.2 J g−1 K−14.2\text{ J g}^{-1}\text{ K}^{-1} and ignore calorimeter heat.
Total: 5 marks

(a) Calculate heat gained by water. (2 marks)

(b) Calculate specific heat of the metal. (3 marks)

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cbse-chemistry-11.u5.t5-3.laq.009

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