When \(100 \mathrm{~g}\) of boiling water at \(100^{\circ} \mathrm{C}\) is added into a calorimeter containing \(300 \mathrm{~g}\) of cold water at \(10^{\circ} \mathrm{C}\), temperature of the mixture becomes \(20^{\circ} \mathrm{C}\). Then a metallic block of mass \(1 \mathrm{~kg}\) at \(10^{\circ} \mathrm{C}\) is dipped into the mixture in the calorimeter. After reaching thermal equilibrium, the final temperature becomes \(19^{\circ} \mathrm{C}\). What is the specific heat of the metal in C.G.S. unit?

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.