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 evs let's play with water law of constant proportion - i law of constant proportion law of definite proportions

Different samples of water were found to contain hydrogen and oxygen in the ratio of 1 : 8. This shows the law of:

  1. multiple proportions

  2. constant proportions

  3. reciprocal proportions

  4. conservation of mass
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Law of Constant proportion states that a chemical compound always contains same elements combined together in the same proportion by mass.

Multiple choice evs let's play with water law of constant proportion - i law of constant proportion law of definite proportions

Any sample of pure water, irrespective of its source, contains 88.89% oxygen and 11.11 % hydrogen by mass. The data supports the:

  1. Law of conservation of mass

  2. Law of constant composition

  3. Law of multiple proportion

  4. Law of reciprocal proportion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This law states that all samples of a given chemical compound have the same elemental composition by mass e.g. oxygen makes 8/9th of the mass of pure water while hydrogen makes up the remaining 1/9th of the mass.

Multiple choice evs let's play with water law of constant proportion - i law of constant proportion law of definite proportions

Which of the following statement is incorrect for the composition of water?

  1. For water, the gravimetric or mass ratio of hydrogen to oxygen is $1:8$
  2. In water, the ratio of hydrogen and oxygen is $2:1$ by volume

  3. The ratio in which hydrogen and oxygen combine gives the composition of water.

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

All of the following statements are correct for the composition of water.
A
For water, the gravimetric or mass ratio of hydrogen to oxygen is 1:8.
B
In water, the ratio of hydrogen and oxygen is 2:1 by volume.
C
The ratio in which hydrogen and oxygen combine gives the composition of water.
Note:
$2H _2 + O _2 \rightarrow 2H _2O$
Thus, the composition of water is $H : O = 2: 1 $
It is the ratio in which hydrogen and oxygen combine. The atomic masses of H and O are 1 and 16 respectively. Hence, for water, the gravimetric or mass ratio of hydrogen to oxygen is 2:16 or 1:8.
In water, the ratio of hydrogen and oxygen is 2:1
by volume. It is equal to the ratio in which hydrogen and oxygen combine.

Multiple choice evs let's play with water law of constant proportion - i law of constant proportion law of definite proportions

If water samples are taken from the sea, rivers, clouds, lakes or snow, they will be found to contain hydrogen and oxygen in the ration of $1 : 8$. This clearly demonstrates the law of ?

  1. Chemical equilibrium

  2. Definite proportions

  3. Combining volumes

  4. The relation of elements in the periodic tables
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In chemistry, the law of definite proportion states that a given chemical compound always contains its component elements in a fixed ratio (by mass) and does not depend on its source and method of preparation. Since in all the water samples given, taken from the sea, rivers, clouds, lakes or snow, the hydrogen and oxygen ratio is constant, hence it clearly demonstrates the law of definite proportions.
Multiple choice evs let's play with water law of constant proportion - i law of constant proportion law of definite proportions

A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen
by mass. The data supports the:

  1. law of conservation of mass

  2. law of constant composition

  3. law of multiple proportion

  4. law of reciprocal proportion
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the law of constant composition in a given compound, the elements always combine in the same proportion as each other.

Water($H _{2}O$) molecule consists of two hydrogen atoms of relative mass 1 and one oxygen atom of relative mass 16. 

Therefore, the ratio in which 2 atoms of hydrogen and one atom of oxygen are combined is $1:8$ and will always be the same irrespective of the source of water.

Therefore, the correct option is $B$

Multiple choice chemistry atoms, molecules and chemical reactions law of constant proportion - i law of constant proportion law of definite proportions
Assertion (A): Pure water obtained from different sources such as a river, well, spring, the sea always contains hydrogen and oxygen in the ratio of 1:8 by mass.

Reason (R): The total mass of reactants and products during chemical or physical change is always the same.

  1. Both A and R are true and R is the correct explanation of A

  2. Both A and R are true and R is not correct explanation of A

  3. A is correct and R is incorrect

  4. A is incorrect and R is correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Assertion states the law of definite proportions, which is true for pure water regardless of source. Reason states the law of conservation of mass, which is also a true chemical principle. However, the constant composition by mass is not explained by the conservation of mass during reactions.

Multiple choice physics semiconductors band theory of solids, a brief introduction electron energies in solids energy bands

With rise in temperature the resistance of germanium,

  1. increases

  2. decreases

  3. remains the same

  4. first increases then decreases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

germanium is a semiconductor and as we know  when a semiconductor is heated, electron-hole pair is generated in it which increases its conductivity as the number of charge carriers are increasing.
Now, as conductivity increases resistance decreases because both are opposite of each other.

Multiple choice biology windows of knowledge human tongue organ of taste tongue : the organ of taste

Taste buds detect the substance only when the substance is

  1. Solid

  2. Semisolid

  3. Semiliquid

  4. Liquid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Taste buds are the taste receptors that are present on the surface of tongue in small projections called as papillae. Saliva of mouth dissolves the food and turns it into liquid or small solid molecules suspended in liquid. The liquid food enters the small pores of taste buds and stimulates the taste receptors to release chemicals and generate a nerve impulse. Since only liquid food can enter the small openings or pores of taste buds, taste buds can detect the substances present in the liquid state. 

Since solid, semi-solid and semi-liquid substances can’t enter the small openings of taste buds, they are not being detected. 
Therefore, the correct answer is option D.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Find the odd one out.

  1. Evaporation

  2. Condensation

  3. Salination

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

Evaporation, condensation, and precipitation are all stages of the water cycle. Salination is the process of increasing salt content in soil or water, which is not a part of the water cycle.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Sublimation is _________________.

  1. Conversion of solid molecule directly into gaseous state.

  2. Conversion of solid molecule directly into liquid state .

  3. Conversion of liquid molecule directly into solid state.

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The process of conversion of the solid molecules directly into gas is known as sublimation. Generally, Ice converts to water and this water converts to water vapor (gas). So the process of conversion of states of matter is solid converts to liquid and this liquid boils out to give gas. But, the liquid state is devoid in case of sublimation. Conversion of Camphor to gas is an example of sublimation. Sublimation helps to dry substance within getting moist. It is also beneficial in medicines. Water also undergoes sublimation at the triple point.
Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Condensation is the phenomenon of

  1. Converting gaseous molecule from gaseous state to liquid state.

  2. Converting gaseous molecule from gaseous state to solid state.

  3. Inter conversion of solid molecule to liquid molecule.

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

The phenomenon by which gaseous molecules convert from gaseous state to liquid state is called condensation. It is the process by which water vapor in the air is changed into liquid water. Condensation is responsible for the formation of clouds. That’s why it is crucial to the water cycle. These clouds produce precipitation which is the primary route for water to return to the Earth’s surface through rain. Condensation is the opposite of evaporation.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Find the odd one out and give explanation of your choice.

  1. Evaporation

  2. Condensation

  3. Salination

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

Evaporation, condensation, and precipitation are fundamental processes of the water cycle. Salination refers to the accumulation of salts in soil or water, which is distinct from the water cycle.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Water is required for ______ processes.

  1. Finishing

  2. Manufacturing

  3. Packaging

  4. Both a and b
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In manufacturing processes, water is used to generate electric power, to make steam for processing and cleaning, to cool or control process temperature, to rinse, to dilute food, and to formulate products containing water.