QJEEAdv19Ch5c85: JEE Advanced 2019 Chemistry - Class 11 JEEAdv19Ch5c85 Solution: Which of the following statement(s) is(are) correct regarding…

The explanation of given statements are as follows :

(a) U_rms is inversely proportional to the square root of its molecular mass.

${U_{rms}} = \sqrt {{{3RT} \over M}}$

Hence, option (a) is correct.

(b) When temperature is increased four times then U_rms become doubled.

${U_{rms}} = \sqrt {{{3R} \over M} \times 4T}$

${U_{rms}} = 2 \times \sqrt {{{3RT} \over M}}$

Hence, option (b) is correct.

(c) and (d) E_av is directly proportional to temperature but does not depends on its molecular mass at a given temperature as ${E_{av}} = {3 \over 2}KT$ . If temperature raised four times than E_av becomes four time multiple.

Thus, option (c) is incorrect and option (d) is correct.