Question

Assertion: The lowest hypothetical or imaginary temperature at which gases are supposed to occupy zero volume is called absolute zero.
Reason: Volume of the gas becomes zero i.e gas does not exist at this temperature.
a.Both assertion and reason are correct and reason is the correct explanation for assertion .
b.Both assertion and reason are correct but reason is not the correct explanation for assertion.
c.Assertion is correct but reason is incorrect.
d.Both assertion and reason are incorrect.

Answer 1

Hint: As we know that absolute temperature is the temperature at which the thermodynamic system has the lowest energy. Further,it is true that the Volume of the gas at becomes zero i.e gas does not exist at this temperature.

Complete answer:
Firstly we will discuss the concept of absolute zero.
It is basically the lowest possible temperature where nothing could be colder and no heat energy remains in the substance.
Absolute zero is generally the temperature at which the thermodynamic system has the lowest energy.
This was noted earlier that the gas seems to contract indefinitely as the temperature decreases.it was also further noted that an ideal gas at constant pressure would reach zero volume which is now called as the absolute zero.
So, accordingly both the assertion and the reason is correct.

Hence,”a” is the correct option which states that
Both assertion and reason are correct and reason is the correct explanation for assertion.

Note: It is very important to note that any real gas actually condenses to the liquid form or the solid form at some temperature but that temperature is found to be greater than the absolute temperature.