A) Particles of a gas move in all possible directions in straight line.
B) Particles of a gas are always in constant and random motion.
C) Total energy of molecules before and after the collision remains same.
D) None of these
Correct Answer: B
Solution :
[b] Particles of a gas are always in constant and random motion. If the particles were at rest and occupy fixed positions, then a gas would have a fixed shape which is not observed.
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