Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume ‘X’ diffuses twice as fast as another perfume ‘Y’; what is the molecular weight of ‘Y’, if the vapor density of gas ‘X’ is 2? Molecular weight of gas ‘X’ is to be assumed to be 2 ?

Related Mcqs:

1. The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be________________?

   A. 2M
   B. M/2
   C. M
   D. M/4

2. The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________?

   A. Relative humidity
   B. Relative saturation
   C. Percentage saturation
   D. None of these

3. Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the___________________?

   A. Nature of the liquid
   B. Nature of the gas
   C. Temperature of the liquid
   D. Total pressure

4. A vapor whose partial pressure is less than its equilibrium vapor pressure is called a ______________ vapor?

   A. Saturated
   B. Supersaturated
   C. Superheated
   D. None of these

5. A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor?

   A. Saturated
   B. Superheated
   C. Unsaturated
   D. Dry gaseous

6. 1 gm mole of an alcohol whose molecular weight is 74 contains 48 gms of carbon, 10 gms of hydrogen and 16 gms of oxygen. Its molecular formula is__________________?

   A. C4H9OH
   B. C3H21OH
   C. (C2H4)2H2.OH
   D. C2H33OH

7. The vapor pressure of liquids (having similar chemical nature) at any specified temperature ______________ with increasing molecular weight?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. Increases linearly

8. The vapor pressure of liquids of similar chemical nature at any particular temperature _______________ with increase in the molecular weight?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. Either A. or B.; depends on the liquid

9. The density of a gas at N.T.P.is ‘ρ’. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become ¾ 0.75 ρ at a temperature of ____________ °K?

   A. 273°
   B. 300°
   C. 400°
   D. 373°

10. A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO2, 0.05 gm mole of oxygen and 0.80 gm mole of N2. What is its molecular weight ?

    A. 28.6
    B. 30.0
    C. 30.6
    D. 32.6