1.

If a gas ia expanded at constant temperature

Answer»

the PRESURE decreases
the KINETIC energy of the molecules remains the same
the kinetic energy of the molecules decreases
the number of molecules of the gas increases.

Solution :At constant TEMPERATURE, the kinetic energy remains same (`:.K.E. PROP T`) i.e. b. is correct and c is incorrect.
At constant temperature
PV=Constant [Boyle.s LAW]
If a gas expands i.e., V increases then P decreases i.e. a is correct d is incorrect because there is no change in number of molecules of gas.


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