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The heat needed per unit mass to change the state of a substance is called:
ALatest heat
BLateral heat
CLayered heat
DLatent heat
Answer & Solution
Correct answer: D. Latent heat
1. Temperature stays constant while a substance changes state.
2. Heat is still flowing in or out during that change.
3. The heat per unit mass transferred during a change of state is the latent heat.
4. So the answer is latent heat.
_Source: NCERT Class XI Physics Part II, Ch 10 'Thermal Properties of Matter'_
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