A block of ice at -10°C is slowly heated and converted to steam at 100°C. Which of the following curves represent the phenomenon qualitatively: (a) (b) (c) (d)

Answer: (a). Ice at -10°C: temperature first rises to 0°C (sloping line starting from the initial temperature). Melting at 0°C: horizontal part. Water warms to 100°C: sloping part, then horizontal part while it turns to steam at 100°C. (b) and (d) show heat supplied with no temperature change at the start, and (c) has a vertical jump, so they are wrong. So the answer is (a).

A block of ice at -10°C is slowly heated and converted to steam at… | JEE Main 2024 (30 Jan, Shift 2)

Q16JEE Main 2024 · 30 JAN · SHIFT 2Easy

Calorimetry, Latent Heat & Mechanical Equivalent of Heat

A block of ice at $-10^{\circ}\text{C}$ is slowly heated and converted to steam at $100^{\circ}\text{C}$ . Which of the following curves represent the phenomenon qualitatively:

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Answer: (a)

Ice at $-10^{\circ}\text{C}$ : temperature first rises to $0^{\circ}\text{C}$ (sloping line starting from the initial temperature).
Melting at $0^{\circ}\text{C}$ : horizontal part.
Water warms to $100^{\circ}\text{C}$ : sloping part, then horizontal part while it turns to steam at $100^{\circ}\text{C}$ .
(b) and (d) show heat supplied with no temperature change at the start, and (c) has a vertical jump, so they are wrong.
So the answer is (a).

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