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

MINERAL WATER IS A PURE CHEMICAL

  1. True

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

Mineral water is a mixture containing water and dissolved minerals, not a pure chemical substance. A pure chemical substance consists of only one type of molecule or atom.

Multiple choice

In water cycle, evaporation is a process in which...

  1. water rises to the atmosphere as vapor and then condenses to form clouds

  2. Water goes back to ocean as water vapor

  3. Sun energy heats water vapor allowing it to rise to the atmosphere
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Evaporation is the process where liquid water absorbs thermal energy and turns into water vapor, rising into the atmosphere.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Fill in the blanks by choosing an appropriate option.
When sugar is dissolved in water, it undergoes a (i) change but if sugar is heated in a test tube over the Bunsen burner flame, it first melts, turns brown and finally turns (ii). The new substance formed is __(iii)_ and the change is a _(iv)_ change.

  1. (i) - Physical reversible, (ii) - Black, (iii) - Charcoal, (iv) - Chemical irreversible

  2. (i) - Physical irreversible, (ii) - Black, (iii) - Coal, (iv) - Chemical irreversible

  3. (i) - Physical irreversible, (ii) - Red, (iii) - Charcoal, (iv) - Chemical reversible

  4. (i) - Physical reversible, (ii) - Red, (iii) - Coal, (iv) - Chemical reversible
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dissolving sugar in water is a physical, reversible change. When sugar is heated, it decomposes into carbon and water (chemical reversible change).

$C _{12}H _{22}O _{11} \rightarrow       C    +    H _2O$
                                                        Carbon        (Steam)
                                                   

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

The phenomenon in which white transparent crystal changes into white powder is called :

  1. Deliquescence

  2. Efflorescence

  3. Allotropy

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

Efflorescence is a phenomenon in which white transparent crystal changes into a white powder. Efflorescences can occur in natural and built environments. On porous construction materials it may present a cosmetic problem only, but can sometimes indicate serious structural weakness.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which of the following would you use to keep a dehydrated substance from rehydrating?

  1. Mortar and Pestle

  2. Beaker

  3. Evaporating dish

  4. Crucible

  5. Desiccator
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Desiccator is used to keep a dehydrated substance from rehydrating.
In desiccator, anhydrous calcium chloride or other suitable dehydrating agent is kept that will remove moisture from atmosphere. Thus, it provides dry atmosphere.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Change of a liquid into vapors at any temperature below its boiling point is called as ______________.

  1. solidification

  2. gasification

  3. evaporation

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

In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and gets converted into vapour. This phenomenon of change of a liquid into vapours at any temperature below its boiling point is called evaporation.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Evaporation is a type of vaporization of a liquid that occurs from _________.

  1. bottom of a solid

  2. bottom of a liquid

  3. surface of a gas

  4. surface of a liquid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance. Evaporation occurs only at the surface of a liquid.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

When liquid takes up heat from the surrounding, the surrounding ____________.

  1. cools down

  2. heats up

  3. remains unchanges

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

Liquid requires latent heat of vaporization. So, when the liquid takes up the heat from the surrounding to vaporize, the temperature of surrounding reduces, and it cools down due to loss of heat.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Evaporation that occurs directly from the solid phase below the melting point is called as:

  1. sublimation

  2. solid evaporation

  3. gasification

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

Evaporation that occurs directly from the solid phase below the melting point, as commonly observed with ice at or below freezing or moth crystals (napthalene or paradichlorobenzene), is called sublimation.