Question

Hydrogen gas and oxygen gas have volume $1 cm^3$ each at NTP
(i) Number of molecules is same in both the gases
(ii) The rms velocity of molecules of both the gases is same
(iii) The internal energy of each gas is same
(iv) The average velocity of molecules of each gas is same
The correct options are :

• A. (i) and (ii)
• B. (i), (iii) and (iv)
• C. (ii) and (iii)
• D. (i), (ii) and (iii)

Answer 1

Answer: (B)

As both the gases have equal volume, they must have equal number of moles, hence (i) is correct.
R.M.S. velocity depends on molar mass, hence is different for both the gases (ii) is incorrect.
Both the gases are diatomic, hence, they must have some internal energy. (iii) is correct.
Average velocity of molecules is zero for both the gases. (iv) is correct.