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 mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Some examples of matter and their groups are given in column P and Q respectively.

P Q
(a) Air (i) Molecule
(b) $O _2$ (ii) Mixture
(c) Copper sulphate (iii) Base
(d) Sodium hydroxide (iv) Salt

The correct option is :

  1. a - (ii), b - (iv), c - (i), d - {iii)

  2. a - (iv), b - (iii), c - (ii), d - (i)

  3. a - (i), b - (ii), c - (iii), d - (iv)

  4. a - (ii) , b - (i), c - (iv), d - (iii)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

(a) Air is a mixture of several gases that are invisible and odorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide, and other gases.

(b) Oxygen (O) is a chemical element (atomic number 8). It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds with most elements. It exists as a $O _2$ molecule in the natural state.
(c) Copper(II) sulfate is a salt and an ionic compound because it is formed from a metal and a non-metal.
(d) Sodium hydroxide is a strong base.
Thus Option D is correct.

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Identify the heterogeneous mixture among the following:


( Brass, common salt and sulphur, water and oil, aerated water, steel )

  1. Common salt and sulphur, Water and oil

  2. Brass, Aerated water, Steel

  3. Common salt and sulphur, Steel, Brass

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

A heterogeneous mixture has non-uniform composition. Common salt and sulphur are distinct solid phases, and water and oil do not mix, forming two distinct layers.

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Which sample is a homogeneous mixture?

  1. Kl(aq)

  2. Fe(s)
  3. $CO _2$(g)
  4. $NH _3$(l)

  5. NaCl(s)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

${ CO } _{ 2 }$ and ${ NH } _{ 3 }$ are a compound as it is made up of different elements.${ Fe(s) } _{  }$ is a pure substance as it is made up of a single element.


$NaCl$ is also a pure substance.${ NH } _{ 3 }$ is a compound as it is made up of different elements.

$KI(aq)$ is a homogeneous mixture as its composition is uniform throughout the mixture.

Hence the correct option is A.

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Which substances show variations in composition on a particulate and macroscopic level?

  1. A pure element.

  2. A simple compound.

  3. A homogeneous solution.

  4. A heterogeneous mixture.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A heterogeneous mixture show variations in composition on a particular and macro scope level. A heterogeneous mixture do not have uniform composition. it show variation at any level whether microscope or macroscopic.

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Magnesium sulphate in water is a ______mixture.

  1. solid-solid

  2. homogeneous

  3. heterogeneous

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

Homogeneous mixture- it is a mixture of solids, liquids and gases that has the same proportions of its components in any sample,

Magnesium sulphate(Epsom salt) is also a homogeneous mixture.
The correct option is [B].

Multiple choice chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

Which one of the following statement is incorrect?

  1. All elements are homogeneous

  2. Compound made up of a number of elements are heterogeneous

  3. A mixture is not always heterogeneous

  4. Air is a heterogeneous mixture
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Air is a mixture of gas in gas.

The mixture of gas in gas is always homogenous.
Thus, air is a homogenous mixture.

Multiple choice biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

Diffusion occurs in
(a) Solids
(b) Liquids
(c) Gases

  1. a,b

  2. b,c

  3. a,c

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

Diffusion occurs in both liquids and gases and can take place over long distances diffusion in gases are much faster than in liquids the diffusion rate of oxygen in the air is 1,00,0001,00,000 times more than diffusion rate of oxygen in the water. Diffusion may be defined as the process of movement of gases. Liquids or solutes from the region of higher concentration to the regions of lower concentration till the molecules are uniformly distributed throughout the available space. Many substances like gases. liquids or solutes can diffuse simultaneously in different directions and at different rates in the same place without interfering with each other.

So, the correct answer is B.

Multiple choice biology movement in and out of the cell diffusion across cells diffusion and osmosis inter cellular movement

Polychlorinated bipheyls are stable, insoluble in water and soluble in

  1. Water

  2. Oil

  3. acids

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

PCBs are very stable mixtures that are resistant to extreme temperature and pressure. In general, PCBs are relatively insoluble in water, and the solubility decreases with increased chlorination. PCBs are also freely soluble in nonpolar organic solvents and biological lipids. They have high solubilities in most organic solvents, oils, and fats. 

Multiple choice botany transport in plants osmotic relations of plant cells transport across membrane imbibition and its importance

Imbibition occurs due to?

  1. Increase in volume of imbibate

  2. Adsorption of imbibate by imbibant

  3. Absorption of imbibant by imbibate

  4. Loss of energy in the form of heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Imbibition is a special type of diffusion when water is absorbed by solids and colloids causing an enormous increase in volume. The substance that imbibes water is called imbibant, and the liquid which is imbibed is called imbibate. Imbibition occurs due to the increase in the volume of imbibate.

 Hence, the correct answer is option A.
Multiple choice chemistry surface chemistry enzyme catalysis catalysis proteins and enzymes

The activity of an enzyme becomes ineffective:

  1. at low temperature

  2. at atmospheric pressure

  3. at high temperature

  4. in aqueous medium.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Enzymes are macromolecular biological catalysts. Enzymes accelerate chemical reactions. The molecules upon which enzymes may act are called substrates and the enzyme converts the substrates into different molecules known as products. 
Enzyme catalysis is unique in its efficiency and high degree of specificity.
  • Enzymes are Highly specific nature.
  • Enzymes are highly active under optimum temperature.
  • Enzymes are highly active under optimum pH.
  • The activity of enzymes gets increased in presence of activators and co-enzymes.

Multiple choice dyes dyes and pigments chemistry in daily life applied chemistry chemistry

If a solid is dispersed in a liquid, the colloid is known as:

  1. gel

  2. sol

  3. emulsion

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

Sol is a colloidal suspension with solid particles as dispersed phase dissolve in a liquid i.e dispersion medium.

Gel are a dispersion of molecules of a liquid within a solid in which liquid particles are dispersed in the solid medium.
An emulsion is a mixture of two or more liquids that are normally immiscible.
Hence answer is option B