28. At a given temperature the root mean square velocities of oxygen and hydrogen molecules are in the ratio
(a) 16 : 1 (b) 1 : 16
(c) 4 : 1 (d) 1 : 4
Answer-d
(7)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)