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 substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

A block of ice floats on a liquid of density $1.2$ in a beaker then level of liquid when ice completely melt.

  1. Remains same

  2. Rises

  3. Lowers

  4. Either (b) or (c)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rises.

The level of the liquid in the beaker will rise. This is because the density of the water formed by the melting of ice is less than that of the density of liquid in the beaker 

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

Glaciers melt:

  1. first at the bootom due to decress in pressure

  2. first at the top due to iuncrease in pressure

  3. first at the bottom due to increase in pressure

  4. first at the top due to increase in pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The melting point of ice decreases with an increase in pressure. The weight of the glacier creates higher pressure at the bottom, causing the ice to melt there first.

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

Assertion (A): When hot water is poured in athick glass tumbler then the tumbler breaks.
Reason (R): Glass is a bad conductor of heat

  1. A and R are correct and R is correct explanation for A

  2. A and R are correct and R is not correct explanation for A

  3. A is true and R is false

  4. A is wrong and R is true.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since glass is bad conductor of heat the heat will try to escape but the glass would not allow it and in the process ultimately glass breaks down.

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

a corked bottle full of water when frozen will break because.

  1. The volume of water increases on freezing

  2. The volume of water decreases on freezing

  3. The bottle contracts on freezing

  4. Glass is a bad conductor of heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A corked bottle of water on being frozen at $0^{\circ}$ undergoes anomalous expansion of water between $4^{\circ}$ and $0^{\circ}$ wherein density of water increases on cooling , causing expansion due to orderly hydrogen bonding, this increasing volume cracks the bottle.
$Density=\cfrac{Mass}{Volume}$
$\Rightarrow D\propto \cfrac{1}{V}$
$\Rightarrow D\uparrow\Rightarrow V\downarrow$

Multiple choice physics transfer of heat heat and heat transfer heat energy transfer heat energy transfers fundamentals of heat transfer conduction

When you pour hot tea suddenly on to a glass tumbler, it cracks. Because:

  1. Glass cannot resist heat

  2. Glass expands unevenly around the place of contact with the tea

  3. Tea has chemicals which react with glass tumblers.

  4. The reason is yet to be discovered by the scientists.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the hot tea is poured into the glass tumbler one side of the glass expands while the other side doesn't. Since glass is not a good conductor of heat, it breaks.

Multiple choice physics transfer of heat heat and heat transfer heat energy transfer heat energy transfers fundamentals of heat transfer conduction

 Pure Water is an insulator.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pure water consists of no impurities; impurities such as salts of $Mg,Ca,Na$ are behaving here as charge carriers but since they are not present; there are no ions. They are neutral water molecules. So pure water do not conduct electricity.

Multiple choice chemistry environment environmental impact: global warming green house effect geobiochemical cycle

The purest form of water that is considered to be ________.

  1. tap water

  2. water from wells

  3. bore water

  4. rain water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Rain water is considered the purest form of water. 

Impurities and salts present in water on earth are left behind during vapourization by the sun. 

These minerals and micro-organisms are present in ground water resources such as tap, well, bore.

herefore, option D is correct.
Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

Which one of the following systems is an example of a closed system?

  1. Some amount of water in equilibrium with its vapour in a closed and insulated vessel

  2. Some amount of hot water enclosed in a closed container which is not insulated

  3. Hot water contained in an open vessel

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

When some amount of water is in equilibrium with its vapour in a closed but non insulated vessel, then it will be an example of closed system.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

Warming ammonium chloride with sodium hydroxide in a test tube is an example of:

  1. closed system

  2. isolated system

  3. open system

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When we are warming ammonium chloride with sodium hydroxide in a test tube, there is exchange of heat as well as mass between system and surrounding. Mass is transferred from the open end of the test tube due to evaporation. Also heat is being exchanged through the walls of test tube.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

In a closed insulator container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true?

  1. $\triangle U=w\neq O,q=O$
  2. $\triangle U=w=q\neq O$
  3. $\triangle U=O,w=q\neq O$
  4. $w=O,\triangle U=q\neq O$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A closed insulated container, a liquid is stirred with a paddle to increase the temperature, therefore it behave as adiabatic system, $q=0$

$\Delta U=q+w$
$\implies \Delta U=w\neq 0$

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

A well stoppered thermoflask contains some ice cubes. This is an example of:

  1. closed system

  2. open system

  3. isolated system

  4. non-thermodynamic system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A thermoflask is designed to prevent the exchange of heat (energy) and matter with the surroundings, making it an isolated system. However, in many textbook contexts, if it is 'well-stoppered' but not perfectly insulated, it is often treated as a closed system regarding matter.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

When a volatile liquid is introduced into an evacuated closed vessel at a particular temperature, both evaporation and condensation take place simultaneously. The system reaches equilibrium state when:

  1. the liquid is completely transformed into the corresponding vapour

  2. equal amounts of liquid and vapour are present in the system

  3. the rate of evaporation becomes equal to the rate of condensation

  4. liquid cannot be converted into vapour and vice versa.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Solution:- (C) The rate of evaporation becomes equal to the rate of condensation
As we know that the equilibrium in a system is established when rate of forward reaction is equal to the rate of backward reaction.
Hence the rate of evaporation becomes equal to the rate of condensation.
Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

A well stoppered thermos flask contains some ice cubes. This is an example of:

  1. closed system

  2. open system

  3. isolated system

  4. non-thermodynamic system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An isolated system is a thermodynamic system that can not exchange either energy or matter outside the boundaries of the system.

Thus, a well stopped thermos flask containing ice an example for isolated system.