Q. If heat is added to a substance but temperature does not rise, then the substance is __________.

यदि किसी पदार्थ में ऊष्मा डाली जाती है लेकिन तापमान नहीं बढ़ता है, तो वह पदार्थ __________ होता है।

A
Melting or boiling
पिघलना या उबलना
B
Cooling
शीतलक
C
Condensing
संघनितजल
D
Freezing
जमना

Explanation

When a substance changes state (e.g., solid to liquid or liquid to gas), the temperature remains constant despite heat being added. This heat is used to overcome intermolecular forces, not to increase temperature.
Examples:

  • Melting (solid to liquid)

  • Boiling (liquid to gas)

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