Chemistry · Science General

States of Matter

2,382 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 changes around us crystallisation process of separating components of a mixture physical changes

Solvent dissolve large amount of solute at________

  1. room temperature

  2. boiling temperature

  3. freezing temperature

  4. less than room temperature but more than freezing temperature
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The solvent dissolves a large amount of solute at boiling temperature, i.e an increase in temperature increases the solubility of the solute. As the temperature increases, the particles of the solid move faster which increases the chances that they will interact more with the solvent molecules. As the temperature increases, the amount of solute that can be dissolved in a solvent increases generally is high at their individual boiling points.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

In which row are the substances correctly classified?

  1. element - brass; compound - sulfur; mixture - water

  2. element - sulfur; compound - brass; mixture - water

  3. element - sulfur; compound - water; mixture - brass

  4. element - water; compound - sulfur; mixture - brass
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$\text{1.water is a compound made by combination of hydrogen and oxygen.}$
$\text{2.sulfur is an element.}$
$\text{3.Brass is mixture of elements sulphur and zinc.}$
Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

A change in which a substance undergoes changes in its physical properties is called:

  1. chemical change

  2. physical change

  3. no change

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

A change in which a substance changes its physical properties like appearance, texture, colour, odour, melting points, boiling points, density, solubility, polarity etc... are called physical changes. 


Physical properties can be observed or measured without changing the composition of matter. They are used to observe and describe matter.

Hence, the correct option is $\text{B}$

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

When substance cool off, there is a decrease in:

  1. size of substance

  2. vibrations of the molecules

  3. temperature

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a substance cools off, the size of substance, vibrations, a temperature of the substance decreases, as the heat is dissipated out resulting in the decrease in the size of the substance, and the internal vibrations between the molecules also decrease as the temperature decreases, due to the loss of heat.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Permanent change is a :

  1. Physical change

  2. Chemical change

  3. Both physical and chemical change

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

A chemical change is permanent. A new substance is formed.


Forms of energy, such as heat, light or electricity, may be emitted or absorbed during a chemical reaction. A chemical change is generally irreversible.

Hence option B is correct.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Change of water into vapor (Vaporization) is which of the following change

  1. Physical and reversible change.

  2. Chemical and reversible change.

  3. Physical and irreversible change.

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

Vapor is another physical state of water. Water can be obtained from the  condensation of vapor. This is a physical and reversible change.

Multiple choice chemistry phenomena around us changes and its classification types of changes classification of changes

Which of the following is a chemical change

  1. Burning of coal

  2. Dissolving sugar in water

  3. Dissolving salt in water

  4. Melting of ice
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A chemical change is the process in which chemical composition of the substance is changed,and physical composition may or may not changed burning of coal that is carbon(C) in presence of oxygen gives a different chemical substance $CO _2$. So, it is a chemical change. Hence option A is correct.