The given diagram describes the changes that take place between different states of matter.
The processes in which heat energy is given out are.

I and III only

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I, IV and V only

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I, II and IV only

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None of these

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Solution

The correct option is D None of these
On heating, solid changes into liquid state which on further heating changes to gaseous state. Whereas on cooling, a gas changes into liquid and a liquid changes into solid. Heat energy is given out when the system is cooled. Thus,
I: Cooling, II: Heating, III: Heating, IV: Cooling, V: Heating, VI: Cooling
Hence, in I, IV and VI processes heat energy is given out.

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Similar questions

Which of the following process / processes release heat ?
(i) condensation (ii) vaporisation (iii) freezing (iv) melting

(a) only (i) (b) only (iv) (c) (i) and (iii) (d) (ii) and (iv)

C O_{2}

C O_{2}

S > M \geq D > H \leq R \leq T < W

M > H \leq Y \leq R < Z \geq . E

Z \geq R

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