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 phenomena around us changes and its classification types of changes classification of changes

A change in which a substance undergoes changes in its physical properties is called:

  1. chemical change

  2. physical change

  3. no change

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

A change in which a substance changes its physical properties like appearance, texture, colour, odour, melting points, boiling points, density, solubility, polarity etc... are called physical changes. 


Physical properties can be observed or measured without changing the composition of matter. They are used to observe and describe matter.

Hence, the correct option is $\text{B}$

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

When substance cool off, there is a decrease in:

  1. size of substance

  2. vibrations of the molecules

  3. temperature

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a substance cools off, the size of substance, vibrations, a temperature of the substance decreases, as the heat is dissipated out resulting in the decrease in the size of the substance, and the internal vibrations between the molecules also decrease as the temperature decreases, due to the loss of heat.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Permanent change is a :

  1. Physical change

  2. Chemical change

  3. Both physical and chemical change

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

A chemical change is permanent. A new substance is formed.


Forms of energy, such as heat, light or electricity, may be emitted or absorbed during a chemical reaction. A chemical change is generally irreversible.

Hence option B is correct.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Change of water into vapor (Vaporization) is which of the following change

  1. Physical and reversible change.

  2. Chemical and reversible change.

  3. Physical and irreversible change.

  4. Irreversible change
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vapor is another physical state of water. Water can be obtained from the  condensation of vapor. This is a physical and reversible change.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Burning of Magnesium ribbon is a _______

  1. Chemical change

  2. Physical change

  3. Reversible change

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

Magnesium ribbon burns with dazzling light in air and forms magnesium oxide.
$2Mg+O _2\rightarrow 2MgO$.
The above change is a chemical changes as new substance is  formed after change. Original
substances cannot be retrieved by simple physical processes.So it is chemical change.
Hence option A is correct.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Which of the following is a chemical change

  1. Burning of coal

  2. Dissolving sugar in water

  3. Dissolving salt in water

  4. Melting of ice
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A chemical change is the process in which chemical composition of the substance is changed,and physical composition may or may not changed burning of coal that is carbon(C) in presence of oxygen gives a different chemical substance $CO _2$. So, it is a chemical change. Hence option A is correct.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Melting of wax is

  1. Reversible change

  2. Irreversible change

  3. Both A,B

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

In melting of wax, only the physical state of the wax changes from solid to liquid. Solid wax can be obtained from molten wax. Molten wax can be again converted to solid wax. This is an example of physical and reversible change. Hence, option A is correct.

Multiple choice chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

There are two samples $A$ and $B$. $A$ is Methanol and $B$ is Ethanol. Both are heated both at the same rate in closed container separately. Which one is correct about the above test?

  1. At $60^0$C, container $A$ and $B$ both have liquids in them
  2. At $80^0$C, container $A$ and $B$ both have vapours in them
  3. At $70^0$C, container $B$ has liquid and $A$ has vapours

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Methanol has a boiling point of $64.7^0$C whereas ethanol has a boiling point of $78.24^0$C. So, all the statements are correct.

Multiple choice chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

Identify the correct set representing properties of Methanol.

  1. Colourless, volatile, poisonous, miscible

  2. Colourless, volatile, non-poisonous, miscible

  3. Colourless, volatile, poisonous, immiscible

  4. Colourless, non-volatile, poisonous, miscible
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Methanol is a light, volatile, colorless, miscible, flammable liquid with a distinctive odor very similar to that of ethanol (drinking alcohol).

Multiple choice chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

Which of the following does NOT involve application of Methanol?

  1. As a solvent

  2. As an anti-freeze in pipelines

  3. In consumable liquor

  4. In Windshield washer fluid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Methanol is toxic in nature and very unfit for drinking purposes.Its consumption can lead to early blindness and further causing death.

Multiple choice evs water: a precious resource importance of water let's play with water water and its properties water resources and conservation

Water, ice and steam are all:

  1. elements

  2. mixtures

  3. compounds

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Compounds can exist in all three states(solid, liquid, gas) provided that they can be heated/cooled enough(to their respective boiling/melting points). Thus water, ice, and steam all are compounds of hydrogen and oxygen.

Multiple choice evs water: a precious resource importance of water let's play with water water and its properties water resources and conservation

Levelling effect is mimimum in

  1. Water

  2. DMSO

  3. Acetic acid

  4. Liquid ammonia
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The levelling effect refers to the inability of a solvent to distinguish between the strengths of strong acids or bases. Water is a leveling solvent for strong acids; however, the question asks where it is minimum. In non-leveling or differentiating solvents, the effect is minimized.

Multiple choice evs water: a precious resource importance of water let's play with water water and its properties water resources and conservation

Which property of water is used while washing clothes?

  1. odour

  2. colour

  3. solubility

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

The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules is called surface tension. while washing clothes, detergents reduce the surface tension of the water molecule which causes the formation of foam and cleaning of clothes. 


Option D is correct.