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

Ice is placed in the upper part of an ice chest because

  1. it is easier to reach there

  2. the water formed by melting can run out more quickly

  3. convection will distribute the cooler air

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

Placing ice at the top of a chest utilizes natural convection. As the air near the ice cools, it becomes denser and sinks, creating a circulation pattern that cools the entire chest effectively.

Multiple choice

Absolute alcohol is

  1. 100% proof

  2. 95% alcohol and 5% water

  3. 200% proof

  4. rectified spirit
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A liquid containing at least 100 per cent of pure ethanol by weight is called absolute alcohol.

Multiple choice

The particles of a mixture ‘x’ do not settle down on keeping undisturbed. Which of the following mixtures can represent ‘x’?

  1. Paint

  2. Muddy water

  3. Chalk powder in water

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

Blood is a colloidal solution, i.e. it is a heterogeneous mixture in which particle size is between 1–100 nm. Colloids are stable solutions as they do not settle down when kept undisturbed. Hence, solution ‘x’ can be blood. 

Multiple choice

Which of the following pairs is correctly matched?

  1. Mixture of sand and water – Uniform composition

  2. Mixture of sugar and water – Non-uniform texture

  3. Water – Fixed boiling point

  4. Sugar – Variable melting point

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water is a compound made of two elements hydrogen and oxygen chemically combined in a fixed proportion mass. Sugar is also a compound and it has a fixed boiling point. Therefore, only option (3) is correct.

Multiple choice

Which of the following statements does not characterise mixtures?

  1. A mixture can be homogeneous or heterogeneous.

  2. A mixture has components in any proportion.

  3. Usually mixtures have sharp melting and boiling points.

  4. In a mixture, the components can be present in varying proportion.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since mixtures are made of more than one component, they do not have sharp melting and boiling points.

Multiple choice

Which of the following substances will have variable composition?

  1. Tea

  2. Water

  3. Sugar

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

Water (H2O), sugar (C12H22O11) and salt (NaCl) are compounds as they are made of two or more elements chemically combined in a fixed ratio by mass. Therefore, they have definite compositions. Tea is a mixture of different compounds like water, sugar, milk, tea leaves, etc. and therefore, it has variable composition and there is no chemical bond between its components. Thus, tea is a mixture.

Multiple choice

Which of the following mixtures is a true solution?

  1. Mixture of starch and water

  2. Mixture of oil and water

  3. Mixture of salt and water

  4. Mixture of sand and water

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

True Solution is a homogeneous mixture of two or more substances in which substance dissolved (solute) in solvent has the particle size of less than 10-9 m or 1 nm. Simple solution of salt in water is an example of true solution.

Multiple choice

The presence of ______ promotes bacterial growth.

  1. moisture

  2. oil

  3. salt

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

Bacteria require specific environmental conditions to thrive, and moisture is a primary factor that promotes their growth and reproduction. High concentrations of salt or oil are often used to inhibit bacterial growth.