a
at constant temperature
b
when temperature is lower than the boiling point
c
when temperature is just near freezing point
d
when temperature is equal to the boiling point
Explanation
Correct Option
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Alexis29
4 years ago
The correct option is A because once the melting point of a substance is reached, the temperature remains constant until the substance changes completely to liquid. Even heat is still being applied, the thermometer doesn't read it, hence it's termed latent heat. The word latent means hidden - in simple terms, the heat being applied at that instant is hidden to the thermometer.
