Chemistry · Science General

States of Matter

2,382 Questions

States of matter questions explore physical changes, evaporation, phase transitions, and the properties of liquids and gases. Topics cover density, cryosurgery, heavy water, and electrolytes. This foundational chemistry topic frequently appears in general science sections of SSC and railway exams.

Phase change mechanismsEvaporation and temperature effectsProperties of liquidsPhysical versus chemical changesElectrolytes and heavy water

States of Matter Questions

Multiple choice chemistry substances in common use percent composition water of crystallisation percentage composition and empirical formula

Water of crystallisation is responsible for ......... of the crystals.

  1. geometric shape and colour

  2. colour

  3. geometric shape

  4. number of crystal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water of crystallisation are water molecules that form an essential part of the crystal structure of some compounds.

Thus, the water of crystallisation is responsible for the geometric shape and colour of the crystals.
For example, Glauber's salt (Sodium sulphate decahydrate) $Na _2SO _4.10H _2O$ has ten water of crystallisation and it is responsible for the colourless monoclinic geometry of the crystals.
Hence, the correct answer option is (A).

Multiple choice chemistry substances in common use percent composition water of crystallisation percentage composition and empirical formula

Water of crystallization is the fixed number of water molecules chemically attached to a unit of a salt in its crystalline form.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water of crystallization means the number of water molecules present in one formula unit of a salt.
For example: $CaSO _4.2H _2O$ is called calcium sulphate dihydrate with and it has $2$ molecules of water of crystallization.

Multiple choice chemistry substances in common use percent composition water of crystallisation percentage composition and empirical formula

The definite number of water molecules which enters into a chemical combination with the substance when the substance is crystallized from its hot saturated solution is called ________. 

  1. crystallization

  2. water of crystallization

  3. formation of water molecule

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The definite number of water molecules which enters into a chemical combination with the substance when the substance is crystallized from its hot saturated solution is called water of crystallization.

Multiple choice chemistry substances in common use percent composition water of crystallisation percentage composition and empirical formula

Water of crystallization is present in a definite :

  1. shape

  2. ratio

  3. volume

  4. size
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water of crystallization or water of hydration or crystallization water is water that occurs inside crystals. Water is often necessary for the formation of crystals. Water of crystallization is the total weight of water in a substance at a given temperature and is mostly present in a definite (stoichiometric) ratio.

Multiple choice chemistry introduction to analytical chemistry percent composition water of crystallisation percentage composition and empirical formula

What is % composition of a substance?

  1. Sum of all the components.

  2. % composition of the sum of two components.

  3. % of the total mass of a substance.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The percent composition of a component in a compound is the percent of the total mass of the compound that is due to that component.

Multiple choice evs sources of water water resources and conservation receding water table water conservation and irrigation importance of water water: a precious resource

Water is listed as one of the basic

  1. Solid forms of matter

  2. Nutrients of cool-aid

  3. Needs of animal and plant life

  4. Unit of life
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water is essential for all living beings (human, animal and plant) for various
metabolic reactions. They gain water not on;y through the action of drinking but also from the food they eat.

Multiple choice evs sources of water water resources and conservation receding water table water conservation and irrigation

Choose the correct answers from the alternatives given .
Which of the following is not a property of water that helps explain why water is so important to life on earth?

  1. Water expands when frozen

  2. Nonpolar compounds dissolve- well in water

  3. Water can absorb great quantities of heat with relatively-small increase in its temperature

  4. Water molecules attract each other
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water is a polar solvent. Therefore, nonpolar compounds do not dissolve well in water. This is a property of water, but it is not a property that explains why water is important to life; rather, it is a limitation.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

A liquid cannot be compressed because it has a fixed volume.

  1. True

  2. False

  3. Either

  4. Neither
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

1) A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure.

2) When you compress liquid together, the molecular forces  become very strong stopping it from being compressed very much.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

Hydrogen was collected in one case over water, and in another over mercury in the same conditions. In both cases, the volume of the gas was the same.
Amounts of hydrogen collected over?

  1. Both liquids were identical

  2. The water was greater

  3. The mercury was greater

  4. Noting can be predicted from the given data
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When gas is collected over water, it is saturated with water vapor (Dalton's Law). The total pressure is the sum of gas pressure and water vapor pressure. Over mercury, there is negligible vapor pressure. For the same volume and total pressure, the dry gas amount must be higher in the mercury case.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

Which liquid has maximum surface tension?

  1. Water

  2. Alcohol

  3. Ammonia

  4. Glycerol
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Tension of the surface film of a liquid caused by attraction of the particles in the surface layer by the bulk of the liquid which minimize surface area.
$\bullet $  Water $=72.86$ $nN/m$
$\bullet$  Ethanol (Alcohol) $=22.10$ $nN/m$
$\bullet$  Glycerol $=64.00$ $nN/m$
Ans :- Option A
Multiple choice chemistry materials liquid crystals liquid state the liquid state

With increase in temperature, the fluidity of liquids 

  1. increases

  2. decreases

  3. remains constant

  4. may increase or decrease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Fluidity is the inverse of viscosity. As temperature increases, the kinetic energy of liquid molecules increases, overcoming intermolecular forces and reducing viscosity, which in turn increases fluidity.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

The boiling point of a liquid with the increase of pressure,  ______________.

  1. decreases

  2. increases

  3. remains constant

  4. changes according to the weather
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since a liquid vaporises when molecules moves faster and farther apart but while increasing pressure, we apply an external force to hold molecules closer to each other. Hence, molecules will require more energy to overcome this resistance thus this increases boiling point of liquid. Hence, the boiling point of a liquid with the increase of pressure, increases.

Multiple choice chemistry materials liquid crystals liquid state the liquid state

With increase in temperature, viscosity and surface tension of a liquid respectively:

  1. Decrease, decrease

  2. Increase, increase

  3. Increase, decrease

  4. Decrease, increase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Temperature is increased.
1) As the temperature of a liquid increases,the movement of its molecule increases,which disturbs the imbalanced forces on the surface of liquid.thus the barrier of tightly bound molecules weakens thereby,Surface tension decreases.
2) As the temperature of a liquid increases,the energy of its molecules increases which increases the movement of molecules.so the liquid becomes more fluid.thus viscosity of liquid decreases.
Multiple choice chemistry materials liquid crystals liquid state the liquid state

Which of the following increases with the increase in temperature in case of liquid?

  1. Surface tension

  2. Vapour pressure

  3. Viscosity

  4. Boiling point
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Vapour pressure increases with increase in temperature. Because, in a closed container solution contains, higher the temperature high will be the evaporation then the pressure created due to vapor i.e vapor pressure increases.
Ans :- Option B.
Multiple choice chemistry materials liquid crystals liquid state the liquid state

When a student was given aviscometer, the liquid was sucked with difficulty, the liquid may be:

  1. benzene

  2. toluene

  3. water

  4. glycerine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Among the given liquid glycerine is a viscous liquid and hence it was sucked with difficulty.