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Stoichiometry

Stoichiometry
Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is

0.2
0.5
0.58
1.72

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Stoichiometry
Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

None of these
Yield enhancement
Heat conservation
Product enrichment

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Stoichiometry
Which of the following expressions defines the Baume gravity scale for liquids heavier than water?

200(G-1)
(141.5/G) - 131.5
145 - (145/G)
(400/G) - 400

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Stoichiometry
The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of

Sum of A and B
Wetting
Difference of A and B
Normal condensation

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Stoichiometry
At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to

Increase in molecular attraction
Increase in average molecular speed
Increased collision rate among molecules
Decrease in mean free path

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Stoichiometry
Addition of a non-volatile solute to a solvent produces a __________ in its solvent.

Vapor pressure lowering
Boiling point depression
All of these
Freezing point elevation

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