Learn more about our help with Assignments: Physical Chemistry
Search & Filtering
Physical Chemistry
Which of the following statements is true about compounds and mixtures?
Both mixtures and compounds always contain a fixed proportion of elements by mass.
Unlike compounds, very little or no exchange of energy occurs during the formation of mixtures.
A mixture cannot be easily separated into its constituents while constituents of a compound can be easily separated.
Compounds and mixtures can be separated into its constituents by chemical methods.
5 __________ is the ratio of molar enthalpy of a liquid to its boiling point.
Raoult's law
Enthalpy rule
Trouton’s rule
Entropy rule
6 The temperature at which the vapor pressure of a liquid equals the external pressure is called its _____________.
Boiling point
freezing point
Melting point
Condensation point
7 What law states that the vapor pressure of a solution containing a non-volatile solute is equal to the vapor pressure of pure solvent times the mole fraction of the solvent?
Gay-Lussac’s Law
Raoult's law
Henry's law
Dalton's law
Both mixtures and compounds always contain a fixed proportion of elements by mass.
Unlike compounds, very little or no exchange of energy occurs during the formation of mixtures.
A mixture cannot be easily separated into its constituents while constituents of a compound can be easily separated.
Compounds and mixtures can be separated into its constituents by chemical methods.
5 __________ is the ratio of molar enthalpy of a liquid to its boiling point.
Raoult's law
Enthalpy rule
Trouton’s rule
Entropy rule
6 The temperature at which the vapor pressure of a liquid equals the external pressure is called its _____________.
Boiling point
freezing point
Melting point
Condensation point
7 What law states that the vapor pressure of a solution containing a non-volatile solute is equal to the vapor pressure of pure solvent times the mole fraction of the solvent?
Gay-Lussac’s Law
Raoult's law
Henry's law
Dalton's law
Physical Chemistry
Which of the followings is NOT a characteristic of an ideal solution?
There is no volume change on mixing
It must be colourless
It must obey Raoult’s law
There is no enthalpy change on mixing
2 What is a compound?
A substance which contains two or more elements physically combined together in fixed ratio.
A substance which contains only metallic and non-metallic elements chemically joined together.
A substance which cannot be separated into its simpler substances by heating alone.
A substance which is made up of two or more elements chemically combined together.
3 Pressure has an appreciable effect on the solubility of __________ in liquids.
gases
solids
liquids
salts
There is no volume change on mixing
It must be colourless
It must obey Raoult’s law
There is no enthalpy change on mixing
2 What is a compound?
A substance which contains two or more elements physically combined together in fixed ratio.
A substance which contains only metallic and non-metallic elements chemically joined together.
A substance which cannot be separated into its simpler substances by heating alone.
A substance which is made up of two or more elements chemically combined together.
3 Pressure has an appreciable effect on the solubility of __________ in liquids.
gases
solids
liquids
salts
Physical Chemistry
Which of these mixtures is not a nearly ideal liquid mixture?
n-hexane and n-heptane
benzene and toluene
water and ethanol
carbon tetrachloride and silicon tetrachloride
17 Which of these alkanes is expected to have the highest viscosity?
Nonane
Heptane
Octane
Decane
18 Which of these is an amorphous solid?
Glass
Diamond
Graphite
Sodium chloride
19 Which of the following is NOT crystalline?
Diamond
Polythene
Potassium iodide
Graphite
20 Which of the following is NOT true of a liquid’s viscosity?
It is independent on intermolecular forces
It is a measure of the resistance to flow
It increases with temperature
A highly viscous liquid flows slowly
n-hexane and n-heptane
benzene and toluene
water and ethanol
carbon tetrachloride and silicon tetrachloride
17 Which of these alkanes is expected to have the highest viscosity?
Nonane
Heptane
Octane
Decane
18 Which of these is an amorphous solid?
Glass
Diamond
Graphite
Sodium chloride
19 Which of the following is NOT crystalline?
Diamond
Polythene
Potassium iodide
Graphite
20 Which of the following is NOT true of a liquid’s viscosity?
It is independent on intermolecular forces
It is a measure of the resistance to flow
It increases with temperature
A highly viscous liquid flows slowly
Physical Chemistry
Which of the following elements, if doped into silicon, would give an n-type semiconductor?
Al
P
C
O
12 The density of a crystal depends on all the following except __________.
Number of atoms
Its mass
Its geometry
Volume of the unit cell
13 Which of the following is not true of liquids?
The inability of a liquid to flow enables it to assume the shape of the container
A liquid never expands to fill the container
The characteristics of a liquid lie between those of a solid and a gas
Particles of liquid are free to move from one point to another
14 Which group of elements in the periodic table is known for semiconductor behaviour?
group I
group II
group III
group IV
15 Which of the following is a pure substance made up of one type of atom?
An element
A mixture
A compound
A solution
Al
P
C
O
12 The density of a crystal depends on all the following except __________.
Number of atoms
Its mass
Its geometry
Volume of the unit cell
13 Which of the following is not true of liquids?
The inability of a liquid to flow enables it to assume the shape of the container
A liquid never expands to fill the container
The characteristics of a liquid lie between those of a solid and a gas
Particles of liquid are free to move from one point to another
14 Which group of elements in the periodic table is known for semiconductor behaviour?
group I
group II
group III
group IV
15 Which of the following is a pure substance made up of one type of atom?
An element
A mixture
A compound
A solution
Physical Chemistry
A liquid will "wet" a surface if:
the liquid has a lesser density than the surface
the forces between the liquid molecules are weak
the liquid has a low vapor pressure
the forces between the molecules and the surface are greater than the forces between the molecules of the liquid
8 Which of the followings does NOT influence the magnitude of surface tension?
Hydrogen bonds
Metallic bonding
Ionic bonding
Dispersion forces
9 Which of the following is true when ice melts?
a phase change occurs from a solid phase to liquid phase
an endothermic process occurs which requires energy
the water changes from a crystalline solid to a liquid
all of the above
10 Which of the following is true when water freezes?
a phase change occurs from a liquid phase to a solid phase
an exothermic process occurs where energy is lost from ice to the surroundings
the liquid water changes from a random structure to a crystalline solid
all of the above
the liquid has a lesser density than the surface
the forces between the liquid molecules are weak
the liquid has a low vapor pressure
the forces between the molecules and the surface are greater than the forces between the molecules of the liquid
8 Which of the followings does NOT influence the magnitude of surface tension?
Hydrogen bonds
Metallic bonding
Ionic bonding
Dispersion forces
9 Which of the following is true when ice melts?
a phase change occurs from a solid phase to liquid phase
an endothermic process occurs which requires energy
the water changes from a crystalline solid to a liquid
all of the above
10 Which of the following is true when water freezes?
a phase change occurs from a liquid phase to a solid phase
an exothermic process occurs where energy is lost from ice to the surroundings
the liquid water changes from a random structure to a crystalline solid
all of the above
Physical Chemistry
A gas becomes liquid by _______________.
Melting
Sublimation
Condensation
Distillation
2 Crystal planes are represented by certain numbers known as __________
Milner indices
Miller indices
Braggs indices
X-ray indices
3 Which of the following elements, if doped into silicon, would give a p-type semiconductor?
Al
P
C
O
4 Which of the followings will not diffract X-rays?
Solid
Liquid
Gas
Crystal
5 Which of these is NOT true about semiconductors?
They are insulators under normal conditions
They conduct under normal conditions
They conduct when heated
Electrical conductivity increases with temperature
6 Surface tension is thought to be due to:
surface area trying to increase
molecules on the surface of the liquid are drawn inwards trying to minimize the surface area.
air absorbed on the surface
surface molecules having lower energy than bulk molecules
Melting
Sublimation
Condensation
Distillation
2 Crystal planes are represented by certain numbers known as __________
Milner indices
Miller indices
Braggs indices
X-ray indices
3 Which of the following elements, if doped into silicon, would give a p-type semiconductor?
Al
P
C
O
4 Which of the followings will not diffract X-rays?
Solid
Liquid
Gas
Crystal
5 Which of these is NOT true about semiconductors?
They are insulators under normal conditions
They conduct under normal conditions
They conduct when heated
Electrical conductivity increases with temperature
6 Surface tension is thought to be due to:
surface area trying to increase
molecules on the surface of the liquid are drawn inwards trying to minimize the surface area.
air absorbed on the surface
surface molecules having lower energy than bulk molecules
Physical Chemistry
14 Fractional distillation cannot be used to _____________.
separate the components of liquid air
refine crude oil
test the purity of a substance
separate methanol and water
15 Angstrom is a unit of ___________.
elasticity
velocity
length
mass
16 Which one of the following can be separated by adding water, stirring and filtering?
Salt and copper sulphate
Salt and sugar
Copper and tin
Sulfur and sugar
17 In order to dissolve the greatest amount of sugar in a cup of water, you should __________.
use sugar crushed into small pieces, and heat the water
use sugar crushed into small pieces, and cool the water
use sugar in large pieces, and heat the water
use sugar in large pieces, and cool the water
18 Convert 10 kg to mg.
10,000,000 mg
10,000 mg
1,000 mg
1,000,000 mg
19 Distillation can be used to separate ______________.
a soluble solid from a solution
a liquid from a solution
a solid from a solid
an insoluble solid from a solution
20 The S.I basic unit for luminous intensity is
Ampere
Lumin
Candela
volt
separate the components of liquid air
refine crude oil
test the purity of a substance
separate methanol and water
15 Angstrom is a unit of ___________.
elasticity
velocity
length
mass
16 Which one of the following can be separated by adding water, stirring and filtering?
Salt and copper sulphate
Salt and sugar
Copper and tin
Sulfur and sugar
17 In order to dissolve the greatest amount of sugar in a cup of water, you should __________.
use sugar crushed into small pieces, and heat the water
use sugar crushed into small pieces, and cool the water
use sugar in large pieces, and heat the water
use sugar in large pieces, and cool the water
18 Convert 10 kg to mg.
10,000,000 mg
10,000 mg
1,000 mg
1,000,000 mg
19 Distillation can be used to separate ______________.
a soluble solid from a solution
a liquid from a solution
a solid from a solid
an insoluble solid from a solution
20 The S.I basic unit for luminous intensity is
Ampere
Lumin
Candela
volt
Physical Chemistry
What is the appropriate S.I. unit for distance?
centimetres
inches
metres
kilometres
8 How many decimeters are there in 15 centimeters?
150 dm
1.5 dm
0.15 dm
none of these
9 The S.I unit for amount of substance is ___________.
Mole
Gram
Dozen
Metre
10 Distillation can be used to separate __________.
a soluble solid from a solution
a liquid from a solution
a solid from a solid
an insoluble solid from a solution
11 Which one of the following can be separated by adding water, stirring and filtering?
Copper and tin
Salt and sugar
Sulfur and sugar
Salt and copper sulphate
12 Fractional distillation cannot be used to ___________.
separate the components of liquid air
refine crude oil
test the purity of a substance
separate methanol and water
13 Fractional distillation cannot be used to ___________.
refine crude oil
separate the components of liquid air
test the purity of a substance
separate methanol and water
centimetres
inches
metres
kilometres
8 How many decimeters are there in 15 centimeters?
150 dm
1.5 dm
0.15 dm
none of these
9 The S.I unit for amount of substance is ___________.
Mole
Gram
Dozen
Metre
10 Distillation can be used to separate __________.
a soluble solid from a solution
a liquid from a solution
a solid from a solid
an insoluble solid from a solution
11 Which one of the following can be separated by adding water, stirring and filtering?
Copper and tin
Salt and sugar
Sulfur and sugar
Salt and copper sulphate
12 Fractional distillation cannot be used to ___________.
separate the components of liquid air
refine crude oil
test the purity of a substance
separate methanol and water
13 Fractional distillation cannot be used to ___________.
refine crude oil
separate the components of liquid air
test the purity of a substance
separate methanol and water
Physical Chemistry
1. ___________ is the S.I unit for amount of substance.
Metre
Gram
Dozen
Mole
2 In filtration, the term ‘filtrate’ refers to _____________.
the solid that remains on the filter paper
the liquid that drains through the filter paper.
the type of filter paper used.
the mixture before separation
3 If 30 g of a substance occupies a volume of 25 cm3, calculate its density on S.I units.
1.2 g/cm3
1.2 kg/m3
0.0012 g/cm3
0.0012 kg/m3
4 Magnetic attraction can be used to separate objects made of _____________.
wood
copper
plastic
ceramic
5 In fractional distillation, a mixture of liquids is separated based on their ___________.
boiling points
solubility
density
chemical composition
6 Magnetic attraction can be used to separate objects made of ____________.
wood
copper
plastic
ceramic
Metre
Gram
Dozen
Mole
2 In filtration, the term ‘filtrate’ refers to _____________.
the solid that remains on the filter paper
the liquid that drains through the filter paper.
the type of filter paper used.
the mixture before separation
3 If 30 g of a substance occupies a volume of 25 cm3, calculate its density on S.I units.
1.2 g/cm3
1.2 kg/m3
0.0012 g/cm3
0.0012 kg/m3
4 Magnetic attraction can be used to separate objects made of _____________.
wood
copper
plastic
ceramic
5 In fractional distillation, a mixture of liquids is separated based on their ___________.
boiling points
solubility
density
chemical composition
6 Magnetic attraction can be used to separate objects made of ____________.
wood
copper
plastic
ceramic
Physical Chemistry
The S.I unit of temperature is __________.
Thermometer
Celsius
Kelvin
Census
18 Which one of the following statements is not consistent with the kinetic-molecular theory of gases?
Individual gas molecules are relatively far apart.
The actual volume of the gas molecules themselves is very small compared to the volume occupied by the gas at ordinary temperatures and pressures.
The average kinetic energies of different gases are different at the same temperature.
There is no net gain or loss of the total kinetic (translational) energy in collisions between gas molecules.
19 Which of these is not a titration apparatus?
Conical flask
Burrette
Volumetric flask
Microwave
20 Which of these is a correct statement?
Volume of a gas is directly proportional to its Celsius temperature
Volume of a gas at constant pressure is directly proportional to its Kelvin temperature
Kelvin temperature is inversely proportional to pressure of a gas at constant volume
The relationship between gas volume and temperature is given by Boy
Thermometer
Celsius
Kelvin
Census
18 Which one of the following statements is not consistent with the kinetic-molecular theory of gases?
Individual gas molecules are relatively far apart.
The actual volume of the gas molecules themselves is very small compared to the volume occupied by the gas at ordinary temperatures and pressures.
The average kinetic energies of different gases are different at the same temperature.
There is no net gain or loss of the total kinetic (translational) energy in collisions between gas molecules.
19 Which of these is not a titration apparatus?
Conical flask
Burrette
Volumetric flask
Microwave
20 Which of these is a correct statement?
Volume of a gas is directly proportional to its Celsius temperature
Volume of a gas at constant pressure is directly proportional to its Kelvin temperature
Kelvin temperature is inversely proportional to pressure of a gas at constant volume
The relationship between gas volume and temperature is given by Boy
