Question

An ideal gas expands while the pressure is kept constant. During this process

• A. $Q$ is positive
• B. $Q$ is negative
• C. $Q$ is equal to zero
• D. Depends upon number of moles.

Answer 1

The correct option is A $Q$ is positive

Given, $P=$ constant
$\therefore T\propto V$
As the gas expands volume increases, so temperature increases.
Hence $\Delta T$ is positive, therefore from the expression
$Q=n{C}_V\Delta T=$ Positive