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

Match the following:

 
a. Evaporation 1. This is the process in which a liquid changes into vapour form even below its boiling point.
b. Sublimation 2. This is the process of changing of a gas to a liquid form by cooling.
c. Condensation 3. This is the process in which a solid changes directly into vapours on heating and vice versa.

  1. a - 1. b - 3, c - 2

  2. a - 1. b - 2, c - 3

  3. a - 3. b - 2, c - 1

  4. a - 3. b - 1, c - 2

  5. a - 2. b - 3, c - 1
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Evaporation is the process in which a liquid changes into vapour form even below its boiling point. Sublimation is the process in which a solid changes directly into vapours on heating and vice versa. Condensation is the process of changing of a gas to a liquid form by cooling.

Multiple choice

Which of the following is the transition of a substance directly from the solid to the gas phase, without passing through an intermediate liquid phase?

  1. Evaporation

  2. Solidification

  3. Condensation

  4. Sublimation

  5. Diffusion
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sublimation is the process where a solid is directly formed from the gas. It  is the transition of a substance directly from the solid to the gas phase without passing through an intermediate liquid phase.

Multiple choice

Which of the following statements is/are incorrect? a. Latent heat of fusion is the amount of heat energy required to change 1 kg of a liquid into gas at atmospheric pressure at its melting point. b. Humidity decreases the rate of evaporation. c. Gases have the weakest inter-molecular forces.

  1. Only a

  2. Only b

  3. Only c

  4. Only a and b

  5. Only b and c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option, as this statement is incorrect. Latent heat of fusion is the amount of heat energy required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point.

Multiple choice
Directions: In the following question, four statements are provided between an opening statement 1 and a closing statement 6. The statements are jumbled up and form a coherent paragraph when properly arranged. Select the alternative representing the proper and logical sequencing of these six taken together.
1. Ice forms in lakes and rivers whenever the surface water super cools to 0°C (32° F) or a fraction of a degree lower.
A. This ice cover continues to thicken downward as a result of transfer of heat from ice to air.
B. The first appearance of ice in a lake usually takes the form of spicule or platelike crystals.
C. Continuous ice covers may also form on rivers that have flow velocities less than about 0.5 m/sec (1.6ft/sec).
D. These grow into a network of dendrites that ultimately freeze together to form a continuous ice cover called skim ice.
6. Ice formations in more turbulent supper cooled water tend to be dominated by a copious crystallization of small particles of ice called frazil.

  1. BCDA

  2. BDAC

  3. DABC

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

The sentence that is required to follow after sentence 1 should be either B or D, according to given answer choices. One can easily see that 4 makes reference to a thing but it hasn't been described in sentence 1. Therefore, sentence B is much better option to be used to follow sentence 1. Look at sentence 6 and C, both of these two talk about formation of ice covers over rivers, so these two can easily be grouped together. Therefore, our order should begin with sentence B and end with sentence C. This marks option (2) as correct answer.

Multiple choice

Which quality of water makes it a good solvent of ionic salts?

  1. it has a high melting point

  2. it has a high dipole moment

  3. it has a high specific heat

  4. it has no colour
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Water's high dipole moment makes it an excellent solvent for ionic salts. The polar water molecules surround and separate ions, dissolving ionic compounds through hydration.

Multiple choice

Which one of the following substances is made up of only one type of atoms?

  1. Water

  2. Milk

  3. Hydrogen

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

Hydrogen gas (H2) consists solely of hydrogen atoms bonded together in pairs. The other options are all mixtures or compounds: water (H2O) contains hydrogen and oxygen, milk is a complex mixture of compounds, and air is a mixture of nitrogen, oxygen, and other gases.