Question

The temperature at which molecular energy is minimum on Kelvin temperature scale is called:
A.Absolute zero Temperature
B.Zero Energy Temperature
C.Absolute Temperature
D.None of These

Answer 1

Hint: Here, we will use the concept of an absolute temperature and the relation between Celsius and Kelvin to justify the given statement. This is the temperature at which we don't observe any excitement and collision among molecules present in a system.

Step by step answer: When you remove heat from any substance, temperature starts dropping. As a result the particles of the substance move slower and slower. And when you keep removing the substance’s temperature it will reach a point where the particle almost stops any motion. And this temperature is known as the absolute temperature.
Initially in the Celsius scale, the scale was set from $0{\text{ to 100}}$ degree Celsius. Where zero is the cooling or the freezing point and hundred is the maximum boiling point of the substance.
We can consider an absolute temperature of the substance where molecules are completely frozen and there is no motion.
The lowest possible temperature, an absolute temperature which corresponds can be expressed in centigrade and in Kelvin as –
\[0K = - 273.15^\circ C\]
According to the definition - The temperature at which molecular energy is minimum on Kelvin temperature scale is called an absolute zero Temperature.

Hence, from the given multiple choices – the option A is the correct answer.

Note: Precisely, no substance or molecules are absolutely motionless but the kinetic energy of the substance is very very small, as a result it can be taken as zero. An absolute zero is the non-realistic concept, but the RMS (Root mean square) velocity of the molecules approaches zero.