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

A solid transitioning to gas without melting is called as

  1. boiling

  2. melting

  3. fission

  4. fusion

  5. sublimation
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The direct transition of a solid to a vapour without passing through a liquid phase is known as sublimation. Examples: the transition of solid CO2 to CO2 vapour.

Multiple choice

Which of the following statements is / are correct? A. The process of evaporation causes cooling. B. Diffusion takes place in a haphazard and random way. C. The process of melting glass is known as annealing.

  1. A only

  2. B only

  3. C only

  4. A and B

  5. B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A. The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings makes the surroundings cold. B. Diffusion takes place through the haphazard and random way. C. The process of cooling glass is known as annealing.

Multiple choice

Which of the following pairs represent liquid only?

  1. Potassium chloride and ammonium chloride

  2. Benzoyl chloride and propanol

  3. Ozone and sulphur trioxide

  4. Carbon monoxide and ozone

  5. Propanol and potassium chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Benzoyl chloride and propanol are liquid.

Multiple choice

Assertion (A): Water droplets on the outer surface of a glass body containing ice-cold water. Reason (R): The water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.

  1. A is true and R is the correct explanation of A

  2. A is false and R is the correct explanation of A

  3. A is true and R is not the correct explanation of A

  4. All of the above

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets. Hence, A is true and R is the correct explanation of A.

Multiple choice

Water obtained from which of the following sources is the purest?

  1. Water obtained from sea

  2. Water prepared in laboratory-distilled water

  3. Water coming in our taps

  4. Water present in packed bottles like Bisleri
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Distilled water is the purest form of water because it is produced by boiling water into steam and then condensing it back into liquid, leaving behind virtually all impurities, dissolved salts, and contaminants. Sea water contains high salt content, tap water may contain minerals and treatment chemicals, and bottled water like Bisleri undergoes purification but still contains some dissolved minerals compared to completely pure distilled water.

Multiple choice

Which of the following is a heterogeneous mixture?

  1. NaCl in water

  2. Iodine in CCl4

  3. Alcohol and water

  4. Sulphur in water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sulphur in water is a heterogeneous mixture because sulphur is insoluble in water - you can see yellow sulphur particles suspended in water, which will eventually settle at the bottom. The other options form homogeneous mixtures: NaCl dissolves completely in water, iodine dissolves in carbon tetrachloride, and alcohol mixes completely with water to form a uniform solution.

Multiple choice

Which one of the following is not a heterogeneous mixture?

  1. Sand and water

  2. Sugar and milk

  3. Sugar and sand

  4. Rice and water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sugar and milk forms a homogeneous mixture because sugar completely dissolves in milk, creating a uniform solution where you cannot see separate components or distinguish sugar particles from milk. The other options are heterogeneous: sand in water settles, sugar and sand remain as separate visible particles, and rice in water shows distinct solid particles in liquid.

Multiple choice

Which one of the following is not a mixture?

  1. Sea water

  2. Air

  3. Common salt

  4. Pickle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Common salt (NaCl) is a pure compound, not a mixture, because it has a fixed chemical composition and consistent properties throughout - every part is identical NaCl. Sea water contains salt, minerals, and organic matter (mixture), air is a mixture of nitrogen, oxygen, CO2 and other gases, and pickle contains spices, oil, salt, water and other ingredients (mixture).