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

When a solution of sugar is slowly frozen, the first solid which separates is

  1. ice

  2. solid solution of sugar and ice

  3. sugar

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

When sugar is added to water and a mixture of these two is formed, it suffers from lowering in freezing point and the freezing point of water is lowered and hence the first solid which separates out is ice. It is one of the colligative properties of a solution which is subjected to a change by the addition of solute.

Multiple choice

The process of dissolution of salt is exothermic if

  1. lattice energy = hydration energy

  2. lattice energy < hydration energy

  3. lattice energy > hydration energy

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

 If the lattice energy is less than the hydration energy,  more heat is needed to be supplied in order to dissolve the salt in the solution.Hence it will be exothermic.

Multiple choice

Acids are stored in containers made of

  1. ceramics

  2. glass

  3. a & b

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

Acids are stored in containers made of ceramics and glass as they don't react with the acids.

Multiple choice

In cold countries Glycerol is added to water in car radiators as it helps to

  1. lower the specific heat of water

  2. lower he viscosity of water

  3. lower the freezing point of water

  4. improve the lubricity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Glycerol acts as an antifreeze agent when added to water. It lowers the freezing point of the mixture, preventing the radiator water from freezing in cold climates.

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.