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 reactions of haloarenes haloalkanes and haloarenes chemistry

In the depression of freezing point experiment, it is found that
(i) The vapour pressure of the solution is less than that of pure solvent
(ii) The vapour pressure of the solution is more than that of pure solvent
(iii) Only solute molecules solidify at the freezing point
(iv) Only solvent molecules solidify at the freezing point

  1. I,II

  2. II,III

  3. I,IV

  4. I,II,III
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the depression of freezing point, the vapor pressure of the solution is lower than that of the pure solvent (Raoult's Law). At the freezing point, only the solvent molecules solidify, leaving the solute in the remaining liquid.

Multiple choice intermolecular forces: cohesive and adhesive forces surface tension properties of matter physics

A piece of ice. With a stone frozen inside it, is floating in water contained in a beak. When the ice metls,the level of water in the beaker.

  1. Rises

  2. Falls

  3. Remains uncharged

  4. Fall at first and then rises to the same height as before.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When ice melts, the volume of water displaced by the ice (Archimedes' principle) is equal to the volume of the water formed by the melted ice. The stone's displacement remains the same. Thus, the water level remains unchanged.

Multiple choice intermolecular forces: cohesive and adhesive forces surface tension properties of matter physics

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

  1. mercury is a metal

  2. density of mercury is greater than that of water

  3. cohesion of mercury is greater than its adhesion with glass

  4. cohesion of water is greater than its adhesion with glass
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mercury remains spherical on a glass plate due to greater cohesive force between mercury molecules than adhesive force between mercury and glass plate.

Multiple choice chemistry changes around us can all changes be reversed? substances and objects classification of changes

Which of the following is not a reversible change?

  1. Heating of water to steam

  2. Cooking of egg to scrambled eggs

  3. Heating of wax to molten wax

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

A reversible change can be undone to return to the original state. Cooking an egg involves chemical changes that permanently alter the proteins, making it irreversible.

Multiple choice chemistry changes around us can all changes be reversed? substances and objects classification of changes

Which of the following change cannot be reversed ?

  1. Hardening of cement

  2. Freezing of ice cream

  3. Opening a door

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

A reversible change is a physical change that can be undone. 
A final substance can be converted back to the original substance without creating any new material.
An irreversible change is a permanent change that cannot be undone.


A. Hardening of cement is an irreversible change as we cannot reverse back to the original cement powder form once the cement hardens.
B. Freezing of ice-cream is reversible change as it can be reversed back by heating and it will convert to original form.
C. Opening of a door is reversible change as it can be reversed simply by closing the door 
D. Melting of chocolate is reversible change as it can be reversed by cooling the chocolate to its original form.
Option A is the correct answer.

Multiple choice particles of a gas ideal gases physics

With increase in temperature, the density of a substance in general :

  1. increases

  2. decreases

  3. first increases then decreases

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

$Answer:-$ B

In general desity decreases with increase in temperature since $density=\dfrac{mass}{volume}$ 
Volume increases in general with increase in temperature and it is inversely proportional to density hence density decreases.
But for the case of water(when heated) it is different heating, its density first decreases and then increases.

Multiple choice particles of a gas ideal gases physics

A drop of ink put in water illustrates

  1. Heating of molecules in a substance

  2. Stationary nature of molecules in a substane

  3. Motion of molecules in a substance

  4. Motion of substance in a molecule
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A drop of ink when poured in water gradually moves in the entire quantity of water and mixes to make the colour blueish.This is due to the diffusion of ink particles into the water particles.

Multiple choice particles of a gas ideal gases physics

Why does glass break on sudden heating?

  1. All parts of glass expand equally

  2. All parts of glass don't expand equally

  3. High temperature makes a substance unstable

  4. Glasses are easy to break
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pouring boiling water into a glass is highly likely to shatter it because the hot water contacts only a few part of the glass first whereas the other parts of the glass (such as the outside of the cup) remain cooler. The glass thus does not expand as a whole, but is pulled in different directions as part of it expands and part does not. This difference produces the shattering.

Multiple choice particles of a gas ideal gases physics

Hot water is poured on top of cold water. Gradually mixture attains same temperature. This happens because of 

  1. Instability

  2. Electrostatic attraction

  3. Gravitational force

  4. Motion of molecules in water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hot water mixes with cold water due to motion of water molecules and total volume attains same temperature.Overall a diffusion of particles take place between hot and cold water.

Multiple choice particles of a gas ideal gases physics

Sugar particles slowly dissolve in water. This shows

  1. Refractive properties of water

  2. Motion of molecules in a substance

  3. Motion of substance

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

Sugar mixes in water because of motion of sugar molecules around water molecules.Overall a diffusion process is seen in it as sugar particles diffuse into water particles.

Multiple choice particles of a gas ideal gases physics

Speed of molecules is _______ in hot water than in cold water

  1. more

  2. less

  3. equal

  4. less than or equal to
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As molecules are heated, they gain kinetic energy and hence speed.We already know that kinetic energy is proportional to temperature of random moving particles.