Chemistry · Science General

States of Matter

2,682 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 matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

 At the melting point, the solid and liquid phase exist in:

  1. equilibrium

  2. no equilibrium

  3. same kinetic energy

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

At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at standard pressure. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point. 

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Evaporation occurs .................... the boiling point.

  1. below

  2. above

  3. equal

  4. both b and c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Evaporation occurs below the boiling point of the liquid. The particles escape from the surface of the liquid to form gas. Evaporation differs from boiling in that it only takes place at the surface of the liquid and it is very slow. On the other hand, boiling takes place throughout the liquid and is very fast.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

During melting, the temperature:

  1. increases

  2. falls

  3. constant

  4. increases and then decreases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During melting, the temperature remains constant. This is because the heat energy is taken in by the particles to overcome forces between them instead of being used to raise the temperature.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Matter undergoes a change. The changes are of two types : Physical and chemical change. A physical change is a change that involves only a change in the physical state of matter.
Its chemical properties remain the same. Usually increasing the temperature of applying pressure or both brings about a physical change. On reversing the condition, i.e., reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible. A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, the chemical and physical properties of the substance is formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance. When zinc carbonate is heated and cooled, the change(s) that are observed are :

  1. Physical

  2. Nuclear changes

  3. First chemical and then physical

  4. First physical and then chemical
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

First zinc carbonate decomposes to give zinc oxide and $CO _2$ and zinc oxide appears yellow when hot and white when cold. Initially, zinc carbonate under goes chemical change. Cooling of zinc oxide a goes physical change, to change its colour from yellow to white.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Which of the following generalizations cannot be made about the phase change of a pure substance from solid to liquid?

  1. It involves a change in potential energy.

  2. It involves no change in temperature.

  3. It involves a change in kinetic energy.

  4. It involves a change in entropy.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a pure substance undergoes a phase change from solid to liquid state,there will increases in temperature so,the collision rate do not increases which implies that there is no change in kinetic energy,the entire heat involves a change in potential energy.It involves change in entropy because more free particles are generated from solid to liquid.

Multiple choice chemistry matter in our surroundings diffusion in different states of matter properties of solids, liquid, and gas particle theory of matter

Statement I: Water droplets form on the outside of a beaker containing an ice bath.
Statement II: Water vapor molecules in the air lose energy when they collide with the cold glass surface and condense.

  1. Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

  2. Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

  3. Statement I is correct, but Statement II is incorrect.

  4. Statement I is incorrect, but Statement II is correct.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Condensation is a process in which gaseous molecules lose energy and gets converted to liquid state.

Water droplets are formed on outside of a beaker containing ice bath because water molecules in air loose energy when they collide with the cold glass surface  and condense.

Multiple choice physics option b: engineering physics conversion of heat into work: heat engine and it's efficiency engines and cycles refrigerators and heat pumps

Which of the following is true about refrigeration?

  1. Heat is removed from the inside of the refrigerator

  2. Cold air is produced inside the refrigerator

  3. Hot air is removed from the inside of the refrigerator

  4. Hot air is changed to a cold condensate inside the refrigerator

  5. Hot air inside the refrigerator is expanded to remove its heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A refrigerator is infact a reverse heat engine which absorbs heat from source (material) at lower temperature, do work on it and then passes the heat to the sink (sorrounding) at higher temperature, thus we can say that heat is removed from inside the refrigerator.

Multiple choice physics option b: engineering physics conversion of heat into work: heat engine and it's efficiency engines and cycles refrigerators and heat pumps

By opening the door of a refrigerator which is inside a room, the temperature of room ____________.

  1. first decreases then increases

  2. remains unchanged

  3. increases

  4. decreases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the door of a refrigerator is opened the temperature of the room increases as the room is acting as the source here where the heat is rejected.

Multiple choice physics option b: engineering physics conversion of heat into work: heat engine and it's efficiency engines and cycles refrigerators and heat pumps

A refrigerator is a device which works on the principle that evaporation of a liquid gives a cooling effect.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A refrigerator works on principle of thermodynamics of extracting heat from a body which means making it drop its temprature. There is nothing like cooling a thing its a by product of removing or extracting heat from a material or a body. This is what a refrigerator does. Refirgerator with help of coolant flowing through coolant tubes and condensor does this job of extracting heat from the all items kept in refrigerator.

A refrigerator is a device which works on the principle that evaporation of a liquid gives a cooling effect.
Option A is correct.