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 phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

What property stays the same during physical and chemical changes?

  1. Density

  2. Shape

  3. Mass

  4. Arrangement of particle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since the law of conservation of mass is valid under all circumstances, hence, mass always remains the same, whether a substance undergoes physical change or chemical change. 

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

Which of the following is an example of chemical change?

  1. Filling up a balloon with hot air.

  2. Taking a glass of water and freezing it by placing it in the freezer.

  3. A plant collecting sunlight and turning it into food.

  4. Your dog ripping up your homework.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A plant collecting sunlight and turning it into food is a photosynthesis reaction which is an example of a photochemical reaction. This is a chemical change. 

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

What characteristic best describes what happen during a physical change?

  1. Composition changes.

  2. Composition stays the same.

  3. Form stays the same.

  4. Mass is lost.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. 
Physical changes occur when objects or substances undergo a change that does not change their chemical composition.
Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

Common chemical changes are :

  1. change in temperature

  2. formation of precipitate

  3. formation of bubbles

  4. all of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A change in temperature is characteristic of a chemical change. When the reactants are mixed, the temperature change caused by the reaction is an indicator of a chemical change. 


The formation of a precipitate may be one of the most common signs of a chemical reaction taking place. The formation of bubbles, or rather a gas, is another indicator of a chemical reaction taking place. When bubbles form, a temperature change could also be taking place.

So, the correct option is $D$

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

Heating of ammonium chloride solution is a:

  1. physical change

  2. chemical change

  3. depends on temperature

  4. can't say
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Solid ammonium chloride vapourizes to form gaseous ammonium chloride. This is a physical change. Ammonium chloride is partially dissociated. This a chemical change. The products ammonia and chlorine recombine to form ammonium chloride. This is also a chemical change.

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

Burning of candle is a :

  1. physical change

  2. chemical change

  3. both a and b

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

On burning candle, wax melts which is a physical change. Also, the wax near the flame burns and gives $CO _2$, soot, light and heat which is a chemical change. Hence, burning of candle is a physical as well as chemical change.

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

Physical change include change in :

  1. texture

  2. temperature

  3. formation of bubbles

  4. both a and b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The texture of a substance can differ with a physical change. For example, if a piece of wood was sanded, waxed, and polished, it would have a very different texture than it initially had like a rough piece of wood. Although, we cannot see temperature change, unless if a change of state is occurring, so it is a physical change. 


Hence, the correct option is $\text{D}$

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

All of the following involve a chemical change at a particular temperature except :

  1. the formation of HCl from $H _2$ and $Cl _2$

  2. the color change when NO is exposed to air
  3. the formation of steam from buring $H _2$ and $CO _2$

  4. the solidification of vegetable oil at low temperatures
  5. the odor of $NH _3$ when $NH _4Cl$ is rubbed together with $Ca(OH) _2$ powder.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All of the following involve a chemical change at a particular temperature except the solidification of vegetable oil at low temperatures.
It involves physical change. The physical state changes from liquid to solid.

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

Which of the following processes involves a chemical change?

  1. Melting of ice

  2. Photosynthesis

  3. Beating of aluminium sheet to make foil

  4. Melting of wax
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$(A)$ Melting of ice is reversible, $\therefore $  physical change also no change in chemical composition.

$(B)$ ${ 6CO } _{ 2 }+12{ H } _{ 2 }O\rightarrow { C } _{ 6 }{ H } _{ 12 }{ O } _{ 6 }+{ O } _{ 2 }+{ H } _{ 2 }O$
       (chemical change)
$(C)$ malleability $-$ turning into this sheet $-$ physical change as no change in chemical composition.
$(D)$ similarly wax melting can be reversed.

Multiple choice chemistry phenomena around us comparison between physical and chemical changes introduction to physical and chemical changes change around us

If pressure is applied to the equilibrium system of solid $ \rightleftharpoons $ liquid, the melting point of the liquid:

  1. will not chabge

  2. may increase or decrease depending upon its nature

  3. will always increase

  4. will always decrease
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  1. If pressure is applied, according to clausices-ceapeyron equation, the melting point will increase for liquids and decrease for water.
    2. Any external changes that try to take it out of equilibrium will came the system to adjust in a way to counter act that change.
Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

When hot liquid is poured into a thick glass tumbler,it cracks

  1. Glass is good conductor of heat

  2. Glass is poor conductor of heat

  3. Both

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

When hot liquid is poured into a thick glass tumbler,it cracks.the reason is that the glass is a poor conductor of heat.when a hot liquid is poured into a tumbler ,the inner surface of the tumbler becomes hot,while the outer surface remain at room temperature.

Multiple choice physics heat and temperature anomalous expansion of water thermal expansion in solids, liquids and gases thermal expansion

Pouring hot water to open the tightly closed lid is an application of : 

  1. Thermal expansion in liquid

  2. Thermal expansion in solid

  3. Thermal expansion in gas

  4. Thermal expansion in both solid and liquid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When we pour hot water on a tightly closed lid, it expands due to heat gained from hot water. Due to this heat lid expands and becomes loose. This is thermal expansion of solids.

Multiple choice geography the biosphere alternatives for minimising depletion of natural resources components of environment effects and successes of environment conservation

Substances which break into simpler substances in course of time are __________.

  1. Biological substances

  2. Biodegradable substances

  3. Non-biodegradable substances

  4. Pro-magnifying substances
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Biodegradable substances are those substances which are broken down into simpler, harmless substances in nature in due course of time by the biological processes such as micro organisms like certain bacteria.

Multiple choice physics air, winds and cyclones wind and rain example of some natural phenomena uneven heating of earth the concept of bernoulli's principle

If an ideal flask containing hot coffee is shaken, the temperature on the coffee will:

  1. decrease

  2. increase

  3. remain same
  4. decrease if temperature is below $4$C and increase if temperature is equal to or more than $4$C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An ideal flask is designed to be thermally insulated, meaning no heat is exchanged with the surroundings. Shaking the coffee adds a negligible amount of mechanical energy, so the temperature remains effectively the same.

Multiple choice physics superposition of waves-2: stationary (standing) waves: vibrations of air columns from moving to stationary stationary (or standing) waves formation of stationary waves

Standing waves can be produced in.

  1. Solid only

  2. Liquid only

  3. Gases only

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

Standing wave produces when two waves of identical frequency interfere with one another while travelling in opposite directions and this coincidence directions and this coincidence is not possible in fluids or gases.