3.Assertion: the temperature of a substance remain constant during its melting
point or boiling point
Reason : The heat supplied is continuously used up in changing the state of the
substance by overcoming the forces of attraction between the particles.
4.Assertion : The conversion of a gas directly into solid is called condensation.
Reason : Naphthalene leaves no residue when kept in open for some time.
5.Assertion: In gaseous state particles move randomly at high speed.
Reason: The particles of gases have least forces of attraction.
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Q.3
Option a
Q.4
Option B
Q.5
Option A
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