Diffusion is that property by virtue of which a perfume bottle when opened up in

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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.
Options
A. 2
B. 4
C. 8
D. 16

Correct Answer

3. Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the
Options
A. sizes of the component molecules are approximately equal.
B. attractive forces between like and unlike molecules are approximately equal.
C. component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution.
D. all (a), (b) & (c).

4. __________ of SBR is adversely affected, if more quantity of styrene is added to butadiene during its co-polymerisation to produce SBR.
Options
A. Percent elongation
B. Resilience
C. Freezing point
D. Strength

5. Polymethyl methacrylate (PMMA) which is also known as perspex and is produced by bulk polymerisation of methyl methacrylate is not a __________ polymer.
Options
A. thermoplastic
B. thermosetting
C. linear
D. glass like transparent

6. Pick out the wrong statement:
Options
A. A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure.
B. A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a 'superheated vapor'.
C. The temperature at which a vapor is saturated is termed as the boiling point.
D. The difference between the existing temperature of a vapor and its saturation temperature (i.e. dew point) is called its 'degree of superheat'.

7. Refractoriness under load (RUL) is the most important property for the refractory bricks
Options
A. at the hearth bottom of the furnace on which stock is placed.
B. used for furnace insulation.
C. used in the roof of the furnace.
D. none of these.

9. Pickout the wrong statement.
Options
A. Polymers made of only one monomer is called homopolymer.
B. Polymers made of more than one monomer is called copolymer or mixed polymer.
C. Vulcanised rubber is more elastic than natural rubber.
D. The intermoleculer forces in ther-mosplastic polymers are intermediate to that of elastomers & fibres.

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