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 changes around us crystallisation process of separating components of a mixture physical changes

Which of the following is not a feature of chemical change?


(I) Original substance can be obtained by simple physical methods.
(II) It is a temporary change.
(III) The new substances formed have properties different from those of the reacting substances.

  1. I, II

  2. I, III

  3. II, III

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

One more new substances one formed in a chemical change. The new substances formed have properties different from those of the reacting substances. A chemical change is always accompanied by the absorption or evolution of energy in the form of heat, light or sound.

Multiple choice chemistry changes around us crystallisation process of separating components of a mixture physical changes

Which of the following is the most common solvent used for crystallization?

  1. Organic solvent benzene

  2. Plain water

  3. A salt solution of water

  4. Dilute solution of sulphuric acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The most common solvent used in crystallization is water, it does not dissolve the substance to be purified at room temperature, but it dissolves it well at solvent's boiling point, and dissolves soluble impurities well at room temperature.
Water is capable of dissolving a variety of different substances than any other liquid and is called the universal solvent.

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 changes around us crystallisation process of separating components of a mixture physical changes

Crystallisation is an example of ____________.

  1. physical change

  2. biological change

  3. chemical change

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

The process of formation of solid crystals from a homogeneous solution is called crystallization. It is a physical change. Crystallization is the solidification of atoms or molecules into a highly structured form called a crystal. It can also refer to the solid-liquid separation and purification technique in which mass transfer occurs from a liquid solution to a pure solid crystalline phase.

For example Salt we get from seawater can have many impurities in it. To remove these impurities, the process of crystallization is used.

Hence, the correct option is $A$

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

Which of the following is true?

  1. Melting of ice is reversible change.

  2. Burning of magnesium is reversible change.

  3. Rusting of iron is reversible change.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The statement (A) is true.
Melting of ice is reversible change.
Burning of magnesium is irreversible change.
Rusting of iron is irreversible change.