Chemistry - States of Matter
Exam Duration: 60 Mins Total Questions : 30
Consider the following statements
1. When evaporation takes place, cooling takes place.
2. Evaporation takes place at all temperatures, boiling takes place only at the boiling point.
3. Evaporation is a surface phenomenon.
Which of the above is/are true?
- (a)
Only 1
- (b)
1 and 2
- (c)
2 and 3
- (d)
1,2 and 3
Which of the gases will have the highest rate if diffusion?
- (a)
O2
- (b)
CO2
- (c)
NH3
- (d)
N2
Assertion (A) The value of van der Waals' constant 'a' for NH2 is larger than for N2
Reason (R) Ammonia has a lower molecular weight than nitrogen.
- (a)
Both A and R are true and R is the correct explanation of A
- (b)
Both A and R are true, but R is not the correct explanation of A
- (c)
A is true, but R is false
- (d)
A is false, but R is true
At very low temperature, oxygen O2, freezes and forms a crystalline solid.
Which term best describe the solids?
- (a)
Covalent network
- (b)
Molecular crysals
- (c)
Metallic
- (d)
lonic
Assertion (A) Lead is alloyed with tin or antimony to be used in soldering.
Reason (R) The interfacial and the solid is reduced and the liquid flows over solid surface.
- (a)
Both A and R are true and R is the correct explanation of A
- (b)
Both A and R are true, but R is not the correct explanation of A
- (c)
A is true, but R is false
- (d)
A is false, but R is true
Glasses and plastics are
- (a)
amorphous solids
- (b)
supercooled liquid
- (c)
Both (a) and (b)
- (d)
None of these
Which one among the following would expand the most being heated?
- (a)
Water
- (b)
Air
- (c)
Alcohol
- (d)
Glass
As its cools, olive slowly solidifies and forms a solid over a wide range of temperature. Which term best describe the solid?
- (a)
lonic
- (b)
Covalent network
- (c)
Metallic
- (d)
Molecular crystal
Match the Column I (Crystals) with Column II (Type/Structure).
Column I | Column II |
A. Ice | 1. Conductivity covalent solid |
B. Solid CO2 | 2. Insulator |
C. Graphite | 3. Molecular crystal |
D. Silica | 4. Hydrogen bonded structure |
- (a)
A B C D 3 1 2 4 - (b)
A B C D 4 3 1 2 - (c)
A B C D 1 2 3 4 - (d)
A B C D 2 3 1 4
Assertion (A) With the increase of temperature the viscosity of glycerine increases.
Reason (R) Rise of temperature increases kinetic energy of molecules.
- (a)
Both A and R are true and R is the correct explanation of A
- (b)
Both A and R are true, but R is not the correct explanation of A
- (c)
A is true, but R is false
- (d)
A is false, but R is true
At absolute zero, which one of the following is zero for a gas?
- (a)
Potential energy
- (b)
Kinetic energy
- (c)
Vibration energy
- (d)
None of the above
Which one of the following is used as an anti-freezer, which effectively depresses the freezing point of water in an automobile?
- (a)
Ethylene glycol
- (b)
Propanoic acid
- (c)
Glutamic acid
- (d)
Glycolic acid
Consider the following statements
1. A real gas can be approximated as an ideal gas when it is highly dilute
2. Only monoatomic gases can be approximated as ideal gases
3. An ideal gas does not undergo phase transitions
Which of the above statements phase correct?
- (a)
1 and 2
- (b)
1 and 3
- (c)
2 and 3
- (d)
1,2 and 3
Consider the following
1. Viscosity is the reciprocal of fluidity.
2. Molecular interaction between molecular is in order Solid>Liquid>Gas
3. If surface area increase, rate of evaporation decreases.
4. Glass is a supercooled liquid.
Which of the above is/are true?
- (a)
Only 2
- (b)
2 and 3
- (c)
1,2 and 3
- (d)
2,3 and 4
According to which one of the following laws it is indicated that when two or more gases react with one another, their volumes bear a simple ratio?
- (a)
Law of mass action
- (b)
Law of multiple properties
- (c)
Law of reciprocal properties
- (d)
Law of combining volumes
In winter season specially in cold countries, ethylene glycol is added to water in the radiators of cars. it result in
- (a)
reducing the viscosity of water
- (b)
lowering the freezing point of water
- (c)
lowering the boiling point of water
- (d)
reducing the specific heat of water
Air at sea level is found to be dense. This is in accordances with
- (a)
Boyle's law
- (b)
Charles' law
- (c)
Dalton's law
- (d)
Avogadro's law
Assertion (A) All liquids are conductors of electricity.
Reason (R) Under the condition of low pressure and high voltage, liquids can be made conductng
- (a)
Both A and R are true and R is the correct explanation of A
- (b)
Both A and R are true, but R is not the correct explanation of A
- (c)
A is true, but R is false
- (d)
A is false, but R is true
Some of the following properties are transport properties
1. Viscosity
2. Surface tension
3. Thermal conductance
4. Diffusion
Select the correct alternate of transport properties
- (a)
1,2,3,4
- (b)
1,3,4
- (c)
1,3
- (d)
3,4
Consider the following statements
1. Density of water is maximum at 277K
2. Density of water increases from 273 to 277 K and beyond this decreases as expansion predominates
3. Due to extensive hydrogen bonding, water has a very high heat capacity
Select the correct statements
- (a)
1 and 2
- (b)
2 and 3
- (c)
1 and 3
- (d)
1,2 and 3
When a gas is compressed at constant temperature
- (a)
the speeds of the molecules decrease
- (b)
the speeds of the molecules increase
- (c)
the collision between the molecules increase
- (d)
the collisions between the molecules decrease
The mass of water vapour per unit volume of air is known as
- (a)
relative humidity
- (b)
specific humidity
- (c)
absolute humidity
- (d)
variable humidity
Consider the following statements
1. Gases are compressible fluids
2. The molecular interaction energy practically over powers the thermal energy in solid stste
3. Molecules interaction between molecules are identical in steam, water and ice
4. Liquid is incompressible fluid
Which of the above is/are false
- (a)
Only 1
- (b)
Only 3
- (c)
3 and 4
- (d)
1 and 2
The rate of evaporation increase with
- (a)
an increase of surface area
- (b)
an increase of temperature
- (c)
a decrease in humidity
- (d)
All of the above
Select the correct statement(s)
1. Liquid lead does not wet a solid iron surface since the interfacial tension between these two phase is quite large
2. Alloys of tin and lead are used in soldering because the interfacial tension between the liquid and solid is reduced and the liquid flows over solid surface
3. Ice has a sharp melting point whereas glass melts over a range of temperature
- (a)
Only 1
- (b)
Only 2
- (c)
2 and 3
- (d)
1,2 and 3
Phase change from gas to solid is called
- (a)
sublimation
- (b)
deposition
- (c)
fusion
- (d)
vaporisation
Consider the following statements
1. Evaporation is a surface phenomenon
2. The rate of evaporation depends upon the surface area exposed to the atmosphere, the temperature, the humidity and the wind speed
3. Evaporation causes cooling
Which of the statements given above are correct about avaporation
- (a)
1 and 2
- (b)
1 and 3
- (c)
2 and 3
- (d)
1,2 and 3
Consider the following statements
1. The particles of nail polish remover pour on your palm, the particles gain energy from your palm or surroundings and evaporate causing the palm to feel cool
2. After a hot sunny day, people sprinkle water on the roof or open ground because the large latent heat of vaporisation of water helps to cool the hot surface
Which of the statement(s) given above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
1 and 2
- (d)
None of these
Consider the following statements In gaseous state
1. the molecule are very loosely packed having large empty space between them
2. molecules move very rapidly in all direction in a random manner
3. the molecules collide with one another and also with walls of the container with perfectly elastic collisions
Which of the statements given above are correct?
- (a)
1 and 2
- (b)
2 and 3
- (c)
1 and 3
- (d)
1,2 and 3
If a gas is compressed to half of its original volume of 270C, to what them should it be heated to make it occupy its original volume
- (a)
3270C
- (b)
6000C
- (c)
540C
- (d)
3000C