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 chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Sublimation requires additional energy and is an:

  1. endothermic change

  2. exothermic change

  3. both a and b

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

Sublimation is the process of transferring molecules in the solid phase to the gaseous phase. Since liquid state is skipped in this process, a large amount of energy has to be supplied in order to provide the required molecular motion to the molecules. Hence it is an endothermic change

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Statement I: Evaporation is an endothermic process.
Statement II: Heat is absorbed as a substance cools.

  1. Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

  2. Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

  3. Statement I is correct, but Statement II is incorrect.

  4. Statement I is incorrect, but Statement II is correct.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Option C is the correct answer.

Evaporation is an endothermic process. Because, evaporation requires heat. When heat is given into the system, evaporation from the system occurs.
When a substance cools down, it gives off heat in its surrounding. Thus, heat is not absorbed, rather heat is given out into the surrounding for the substance to cool.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Sublimation is a process in which a solid.

  1. Changes into another allotropic form

  2. Changes into liquid form

  3. Changes into vapour form

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

Sublimation is a specialized change of state when a solid substance skips the liquid phase and moves directly into the gas phase. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.

Examples:

  •  "Dry ice" or solid carbon dioxide sublimes.
  •  Snow and ice can sublime in the winter months without melting.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Process in which solid is directly converted to vapors state is called:

  1. sublimation

  2. filtration

  3. drying

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

Sublimation is a technique that helps chemists to purify. During sublimation,upon heating, a solid substance is converted to the gas phase without passing through the liquid phase.  A solid is heated under vacuum. The solid volatilizes and condenses as a purified compound on a cooled surface,  a non-volatile residue of impurities is left behind.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

On heating iodine and sand which will sublime?

  1. Sand

  2. Iodine

  3. Both a and b

  4. None of them
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iodine is a chemical element with atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at a standard conditions that sublimes readily to form a violet gas.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

When heating begins in miscible solutions, vapors formed will be:

  1. of liquid lower in boiling point

  2. of liquid higher in boiling point

  3. vapors will be of both liquids with a higher concentration of liquid having low boiling point

  4. collected in a gas syring
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A distinct layer between two liquids will not form when you have a solution that is labelled miscible. A liquid is considered miscible if it can mix with another miscible liquid to form a homogeneous mixture. When heating begins in miscible solutions, vapours will be of both liquids (as miscible solution will give homogeneous mixture in vapour phase as well) with a higher concentration of liquid having low boiling point (since that component will be more volatile in nature).

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Example of an element is:

  1. Water

  2. Sodium hydroxide

  3. Hydrogen

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

A chemical element is a pure chemical substance consisting of a single type of atom distinguished by its atomic number, which is the number of protons in its atomic nucleus. If you change the number of protons an atom has, you change the type of element it is.

Here, hydrogen is an element while water, sodium hydroxide and sugar are compounds made up of more than elements.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

What is the name given to a pure substance with only one kind of atoms?

  1. Element

  2. Compound

  3. Mixture

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

Element is a chemical substance which is composed of same type of atoms or only of single kind e.g., periodic table consist of all elements in its pure form like $Na,\ Mg,\ Cu,\ Pb$ etc.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Classify which of the following pair is a compound and a mixture?

  1. Air, ocean water

  2. Water, glucose

  3. Glucose, Salt

  4. Water, air
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the above examples, water is a compound and air is mixture. Water consists of oxygen and hydrogen chemically combined whereas air is a mixture which consists of oxygen, nitrogen and other gases which are only physically combined.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which of the following is not a mixture but a compound?

  1. Soda water

  2. Sea water

  3. Soil

  4. None of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All the above examples are mixtures and not compounds. Mixtures are impure substance made up of two or more pure substances. They are not chemically mixed and can be separated by physical means.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which of the following do not show the properties of the constituents?

  1. Water

  2. Air

  3. Sugar solution

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

Water is a compound having hydrogen and oxygen atoms in the ratio of 2:1 and properties of water as chemical compound is different from the hydrogen and oxygen elements.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Water is a  _______ made up of hydrogen and oxygen combined in the ratio ______ by volume or _______ by mass.

  1. compound, 3:2, 1:1 respectively

  2. element, 1:2, 3:1 respectively

  3. compound, 2:1, 1:8 respectively

  4. molecule, 1:1, 1:16 respectively
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water is a chemical compound made up of hydrogen and oxygen combined in the ratio $2:1$ by volume or $1:8$ by mass (2 g of hydrogen combines with 16 g of oxygen).