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Question

In which of the following processes do the change in the states of matter involve the absorption of energy if the pressure remains same?
i. Conversion of water into vapor
ii.Conversion of ice into liquid
iii. Conversion of solid CO2 into gaseous CO2
iv. Conversion of water vapor into liquid water

A
(i) and (ii) only
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B
(ii) and (iii) only
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C
(i), (ii), (iv) only
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D
(i), (ii), and (iii) only
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Solution

The correct option is D (i), (ii), and (iii) only
Conversion of water into vapor is called vaporization.Vaporization occurs when heat is absorbed by the matter.
Conversion of ice into liquid water is called fusion. Fusion occurs when heat is absorbed by the matter.
Conversion of solid CO2 into gaseous CO2 is called sublimation. Sublimation occurs when heat is absorbed by the matter.
Conversion of vapor into liquid water is called condensation. Condensation is the reverse of vaporization i.e. change in the physical state of a substance from a gaseous state to a liquid. Vaporization occurs when heat is absorbed by the matter and condensation occurs when heat is released by the matter.

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Flow chart for inter-conversion of the three states of matter tackle
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