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

Which of the following is not a property of a physical change?

  1. No new substances are formed.

  2. The change is temporary in nature.

  3. The change can be easily reversed by removing the cause of the change.

  4. There cannot be any change in a substance's physical properties.

  5. The composition of substances remains unchanged.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as this is not a property of a physical change. There may be some change in substance's physical properties like colour, smell, taste, etc.

Multiple choice

Which of the following is not an example of a physical change?

  1. Glowing of an electric bulb

  2. Fermentation of cane juice, fruit juice, etc.

  3. Dissolution of sulphur in carbon disulphide

  4. Freezing of water in a fridge

  5. Dissolution of resin in alcohol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Fermentation of cane juice, fruit juice, etc. is irreversible and thus, is not an example of a physical change.

Multiple choice

A synthetic detergent molecule consists of

  1. ionic part which is water attracting.

  2. long chain hydrocarbon part which is hydrophobic.

  3. ionic part which is water repelling and hydrocarbon part which is water attracting.

  4. Both 1 and 2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A detergent molecule has a long hydrocarbon chain that is hydrophobic (water-repelling) and an ionic head that is hydrophilic (water-attracting).

Multiple choice

Milk is an example of

  1. suspension

  2. foam

  3. gel

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

An emulsion is a mixture of two or more liquids that are normally immiscible. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include milk, mayonnaise etc.

Multiple choice

Bleaching powder is used for settling ……… water.

  1. muddy

  2. natural

  3. hard

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

Bleaching powder (calcium hypochlorite) is commonly used in water treatment to disinfect and clarify water by settling impurities, often referred to as muddy water in basic contexts.

Multiple choice

Distilled water is ……….. water.

  1. pure

  2. natural

  3. hard

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

Distilled water is produced by boiling water and condensing the steam, which removes impurities and minerals, resulting in pure water.

Multiple choice

Which of the following is a molecule of an element?

  1. Water

  2. Ozone

  3. Salt

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

Ozone (O3) consists only of oxygen atoms, making it a molecule of an element. Water, salt, and sugar are compounds consisting of two or more different types of elements.