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Q.

Assertion: For an isothermal process in an ideal gas, the heat absorbed by the gas is entirely used in the work done by the gas


Reason: During a process taking place in a system, if the temperature remains constant then the process is isothermal?


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a

Both assertion and reason are correct and reason is the correct explanation for assertion.

b

Both assertion and reason are correct and reason is not the correct explanation for assertion.

c

Assertion is correct but reason is incorrect.

d

Both assertion and reason are incorrect. 

answer is B.

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Detailed Solution

Concept- The isothermal process is one of the cycles; one or two of the processes in the complete cycle (which must include at least four processes) may be isothermal (depends upon the cycle). Isothermal means that the temperature remains constant throughout the process, with no temperature addition or rejection.
The process that follows the constant temperature is known as the isothermal process; it states that no temperature addition or deduction occurs to the gas. It also states that internal energy will remain constant.
This type of mechanism can be seen in perfect cycles such as Carnot's.
As there is no addition or removal of temperature, the heat is absorbed by the gas for the work done in the perfect gas cycle, and the internal energy remains constant.
As a result, the assertion is right, and the reason is also valid in terms of the isothermal process (constant temperature and no change in internal energy), but because the reason is not the correct explanation for the assertion supplied, option (2) is correct.
Hence, the correct answer is option 2.
 
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Assertion: For an isothermal process in an ideal gas, the heat absorbed by the gas is entirely used in the work done by the gasReason: During a process taking place in a system, if the temperature remains constant then the process is isothermal?