A quantity of heat required to change the unit mass of a solid substance to its liquid state, while the temperature remains constant, is known as

latent heat

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latent heat of fusion

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heat

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specific heat

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Solution

The correct option is B latent heat of fusion
During fusion of solid into liquid some energy is used up to transform the state of matter from solid to liquid. Since it does not increase the kinetic energy of particles, there is no increase in the temperature of the material. So, phase transformation takes place at constant temperature.

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