Gce Model Questions Vol1 2023 Chemistry Question 16

Practice objective / multiple choice question 16 from the 2023 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2023 Chemistry Objective / Multiple Choice Medium Difficulty
Question 16 GCE_MODEL_QUESTIONS_VOL1 • 2023 • CHEMISTRY • objective

A 150 g sample of a substance has a melting point of \(120^{\circ}\text{C}\). Its specific heat capacity is \(0.5\ \text{J g}^{-1}\text{K}^{-1}\) in the solid state and \(0.8\ \text{J g}^{-1}\text{K}^{-1}\) in the liquid state. The latent heat of fusion is \(60\ \text{J g}^{-1}\). The sample is initially at \(20^{\circ}\text{C}\) and is supplied with \(12.0\ \text{kJ}\) of heat. Determine the final state of the sample (solid, liquid or mixture) and its temperature, and state how many grams of the substance are melted.

Answer Options

Correct Answer A. Mixture of solid and liquid at \(120^{\circ}\text{C}\); 75 g melted (75 g solid remains).
B. Mixture of solid and liquid at \(130^{\circ}\text{C}\); 80 g melted (70 g solid remains).
C. All liquid at \(120^{\circ}\text{C}\); 150 g melted (0 g solid remains).
D. All solid at \(120^{\circ}\text{C}\); 0 g melted (150 g solid remains).
Correct Answer
A
Correct Option:
Mixture of solid and liquid at \(120^{\circ}\text{C}\); 75 g melted (75 g solid remains).

About This Question

This is Gce Model Questions Vol1 2023 Chemistry Question 16. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Medium .

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