MHT CET202521 Apr 2025Morning ShiftChemistryStates of MatterActual
What is the SI unit of rate of diffusion for a gas?
Options
- Adm ⁻³ ~s
- Bdm ^3 ~s ⁻¹
- CmL ⁻¹ ~s ⁻¹
- DmL s
Correct answer
B. dm ^3 ~s ⁻¹
Step-by-step solution
The rate of diffusion is defined as volume diffused per unit time, V t . The SI unit for volume is m ^3 and for time is s , so the unit is m ^3 s ⁻¹ . Evaluating the options: A) dm ⁻³ s is inverse volume times time, B) dm ^3 s ⁻¹ is volume per time, C) mL ⁻¹ s ⁻¹ is inverse volume per time, D) mL s is volume times time. Only B has dimensions consistent with volume per time. The correct choice is B .