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Effects of Heat

The given dia...

Question

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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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

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