Question

Assertion :Internal energy change in a cyclic process is zero. Reason: Internal energy is a state function.

• 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

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Differential of a state function integrated over a cyclic path returns zero. In other words summation

of change in state function in a cyclic process is equal to zero.

if $[\int ]dx=0\Rightarrow X$ is a state function (property of state function)

note that if $X$ is a state function, $dX$ is called definite quantity

Example: $T,V,P$ and $U$ (internal energy), $H$ (enthalpy) are state variables.