The average $K.E.$ of an ideal gas in calories per mole is approximately equal to

The average kinetic energy of a molecule of an ideal gas at $25 \, ^\circ C$ is .........

Which among the following statements is correct?
$A$. There is a complete order of molecules in gases.
$B$. There is a complete disorder of molecules in gases.
$C$. Molecules are not always in random motion in gases.
$D$. Molecules are fixed at respective position in gases.

Which of the following statement$(s)$ is/are true?

The internal energy of one mole of an ideal gas is ............ .

Which one of the following is the wrong assumption of the kinetic theory of gases?