SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increase the kinetic energy of molecules.
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do work to break the binding force among the molecules.
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increase the kinetic energy of electrons in the molecules.
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do work against the atmospheric pressure.
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Detailed explanation-1: -Latent heat can be thought of as the energy required to break the bonds between the molecules at each change of phase. In ice, water molecules are strongly bound together in crystalline form. When 334 J of energy are added to 1 g of ice at 0°C, these bonds are loosened, producing liquid water at 0°C.
Detailed explanation-2: -Overview. The ‘enthalpy’ of fusion is a latent heat, because, while melting, the heat energy needed to change the substance from solid to liquid at atmospheric pressure is latent heat of fusion, as the temperature remains constant during the process.
Detailed explanation-3: -Latent heat arises from the work required to overcome the forces that hold together atoms or molecules in a material. The regular structure of a crystalline solid is maintained by forces of attraction among its individual atoms, which oscillate slightly about their average positions in the crystal lattice.