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

Which of the following does not conduct electricity?

  1. Sugar solution

  2. Vinegar solution

  3. Lemon juice solution

  4. Caustic soda solution
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pure sugar (sucrose) is a covalent compound that does not dissociate into ions when dissolved in water. Since ions are required to carry an electric charge through a solution, sugar solution is a non-conductor.

Multiple choice

An electrolyte is a

  1. metal

  2. a liquid that conducts current

  3. non-metal

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

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water.

Multiple choice

Carbon is considered to be the

  1. Element of Life

  2. Element of Water

  3. The poison of Life
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon is often referred to as the element of life due to its central role in the molecules that make up living organisms.

Multiple choice

Why will it melt faster in water?

  1. Water molecules will be moving faster than air molecules

  2. Air molecules will be more dense than water molecules

  3. Air molecules move randomly and water molecules don't

  4. Water molecules are more dense and collide more often
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water is much denser than air, meaning there are more molecules per unit volume to collide with the ice cube, facilitating faster heat transfer.

Multiple choice

chemical formula for water is

  1. CO2

  2. O2

  3. H2O

  4. NONE OF THE ABOVE
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water is a chemical compound consisting of two hydrogen atoms and one oxygen atom, represented by the formula H2O.

Multiple choice

Freezing, melting, and boiling are examples of a...

  1. Chemical reactions

  2. Solidiohypermorphology

  3. Physical reactions

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

Freezing, melting, and boiling are changes in the state of matter, not changes in chemical composition. These are classified as physical changes or phase changes.

Multiple choice

When a substance cools down it has...

  1. No kinetic energy

  2. Less molecules

  3. More kinetic energy

  4. Less kinetic energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kinetic energy is the energy of motion. As a substance cools, its particles move more slowly, resulting in less kinetic energy.