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The critical density of a substance is related to its van der Waals constants ( and ) by:
\frac{1}{3b}
\frac{b}{3a}
\frac{a}{3b}
\frac{3a}{b}
The density of an unknown gas at STP is 1.43 g/L. What is the molar mass of the gas?
16 g/mol
32 g/mol
64 g/mol
128 g/mol
The critical density of a substance is:
the density of the substance at STP
the density of the substance at its boiling point
the density of the substance at its critical temperature and pressure
the maximum density a substance can achieve
The anomalous expansion of water refers to its:
Increase in volume upon cooling from 4ยฐC to 0ยฐC
Decrease in volume upon heating from 0ยฐC to 4ยฐC
Higher density in liquid state compared to solid state
Lower boiling point compared to other similar molecules
The anomalous expansion of water below 4ยฐC is attributed to:
Increased kinetic energy of molecules
Formation of a more open hydrogen-bonded structure
Decreased density of water molecules
Increased van der Waals forces
Which method is best suited for separating a mixture of two immiscible liquids with different densities?
Distillation
Separating funnel
Chromatography
Sublimation
If we dissolve 20g of NaOH in 200ml of water, what will be the mass percentage of NaOH in the solution (assuming the density of water is 1g/ml)?
9.09%
10%
11.11%
20%
A sample of a volatile liquid was found to have a vapour density of 30. If 0.2 moles of the liquid occupies 4.9 L at 1 atm and 273 K, what is the abnormal molar mass of the liquid?
60 g/mol
87 g/mol
109 g/mol
120 g/mol
Heavy water is __________ than ordinary water.
less dense
denser
equally dense
slightly less dense
Consider a rain drop falling through air with a terminal velocity 'v'. If the air pressure suddenly decreases but the temperature remains constant, how will the terminal velocity be affected?
Increases
Decreases
Remains the same
Cannot be determined
