States of Matter Test

Result

States of Matter Test - 4

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Question 1
1 / -0

Critical temperature (T_C) of carbon dioxide is the highest temperature at which liquid carbon dioxide is observed. Above this temperature

A
it is mixture of solid and liquid

B
it is gas

C
it is liquid

D
it is solid

Solution

Tc is the highest Temp where a gas can exist in liquid state. Above this no liquid state exist. It is impossible to compress the gas into liquid above critical temperature, no matter what ever amount of pressure is applied.
Question 2
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Above the Critical temperature (TC) of carbon dioxide

A
Solidification of the gas is possible

B
Liquefaction of the gas is possible

C
increase of pressure makes

D
Liquefaction of the gas is not possible

Solution

Tc is the highest Temp where a gas can exist in liquid state. Above this no liquid state exist hence it is not possible to liquify the gas no matter what pressure is applied.
Question 3
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The three states of matter of H₂O are in equilibrium at

A
critical point.

B
ice point.

C
the triple point.

D
steam point.

Solution

Triple point of a substance is the temperature and pressure at which three phases (i.e. gas, liquid and solid) of that substance coexist at thermal equilibrium.
The triple point of pure water is at 0.01°C (273.16K, 32.01°F) and 4.58 mm (611.2Pa) of mercury, where all the three (i.e., solid, liquid and gas) states coexist in equilibrium.
Question 4
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Surface tension decreases as the temperature is raised because increase in temperature

A
decreases the kinetic energy of the molecules and effectiveness of intermolecular attraction decreases.

B
increases the kinetic energy of the molecules and effectiveness of intermolecular attraction increases.

C
decreases the kinetic energy of the molecules and effectiveness of intermolecular attraction is not changed.

D
increases the kinetic energy of the molecules and effectiveness of intermolecular attraction decreases.

Solution

Surface tension is inversely proportional to the temperature. So surface tension decreases with rise in temperature. With rise in temeprature liquids exapands, the interparticle distance increases and the kinetic energy of molecules and hence disorder decreases, so intermolecular forces decreases results in decrease in surface tension.
Question 5
1 / -0

Water has high surface tension and high capillarity because of

A
dispersion forces.

B
ionic bonds.

C
covalent bonds.

D
hydrogen bonds.

Solution

In water molecules, due to high electronegitivity difference between H and O atoms and lone pairs of electrons on oxygen atom, greater number of hydrogen bonds formed