Exams › NEET › Chemistry

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be:

1. 9 u
2. 36 u
3. 64 u
4. 27 u

Correct answer: 36 u

Solution

According to Graham's law of diffusion, the rate of diffusion is inversely proportional to the square root of the molar mass. Since the time taken is inversely proportional to the rate, we use the relation: (tA/tB) = √(MB/MA). Substituting tA = 20 s, tB = 10 s, and MA = 49 u, we solve for MB to get 36 u.

Related NEET Chemistry questions

• Which of the following is a true solution?
• State in which of the following examples the force of attraction between particles of matter is almost negligible.
• Dry ice is:
• Which of the following statement about Avogadro's hypothesis is correct?
• Vapour pressure of a liquid increases with :
• Who proposed that equal volumes of gases at the same temperature and pressure have same number of molecules.

⚔️ Practice NEET Chemistry free + battle 1v1 →