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 physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

A block of wood is so loaded that it just floats in water at room temperature. What change will occur in the state of floatation, if some salt is added to water?

  1. Floats with some part outside water

  2. Just floats

  3. Sinks in the water

  4. Floats completely above water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Floats with some part outside water. 
On adding some salt to water, the density of water increases, so upthrust on block of wood increases and hence the block rises up till the weight of salty water displaced by the submerged part of block becomes equal to the weight of block.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

A piece of ice is floating in a concentrated solution of common salt (in water) in a pot. When ice melts completely, the level of solution will 

  1. Go up

  2. Remain the same

  3. Go down

  4. First go up then go down
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$\rho _{salt water0}>\rho _{ice}$

When ice floats, volume of ice in the salt water is given by
$V _{imm}\rho _{salt water}g=V _{ice}\rho _{ice}g$
$\implies V _{imm}=V _{ice}\dfrac{\rho _{water}}{\rho _{salt water}}<V _{ice}$

Hence when ice melts, whole of the volume would add to water and level of solution would rise.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

An ice cube is floating in a glass of water. What happens to the water level when the ice melts?

  1. Rises

  2. Falls

  3. Remains the same

  4. First rises and then falls
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

according to the Archimedes principle , the floating substance displaces some liquid, so when the ice melts ,there will be no change in the water level as the melted ice will occupy the same volume as it was occupying earlier.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

An ice cube contains a glass ball. The cube is floating on the surface of water contained in a trough on the surface of water contained in a trough. What will happen to the water level, when the cube melts?

  1. It will remain unchanged

  2. It will fall

  3. It will rise

  4. First it will fall and then rise
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When the cube melts, the water level will remain the same.An floating object displaces an amount of water equal to its own weight. Since, water expands when it freezes, one ounce of frozen water has a larger volume than one ounce of liquid water.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

An ice cube contains a large air bubble. The cube is floating on the surface of water contained on a trough. What will happen to the water level, when the cube melts?

  1. $It\ will\ remain\ unchanged$
  2. $It\ will\ fall$
  3. $It\ will\ rise$
  4. $First\ it\ will\ and\ then\ rise$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since density of a hollow ice cube is less than water. Hence it will float and when ice melts, then level of water decreases due to loss in volume.

Multiple choice chemistry energy rocks and minerals petroleum and natural gas fossil fuels

Which among the given examples, is not used as oxygenates?

  1. MEG

  2. Ethanal

  3. MTBE

  4. TAME
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Oxygenates are the chemical compounds containing oxygen.
  • They are usually employed as gasoline additives.
  • Commonly used oxygenates are alcohols or ethers.
  • Here, ethanal, MTBE and TAME are ethers. Thus, MEG (Mono ethylene glycol) is not used as oxygenates.   

Multiple choice

The water droplets that condense on the side of a glass occur because of ___________.

  1. a warm drink meeting hot air

  2. a cool drink meeting warmer air

  3. evaporation of the liquid in the glass

  4. sublimation of the ice
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Condensation occurs when water vapor in the air comes into contact with a cooler surface. The cool glass cools the surrounding air, reducing its ability to hold water vapor, causing it to condense into liquid droplets.

Multiple choice

So why do you think density decreasing causes it to rise?

  1. the matter gets cooler

  2. the matter gets lighter

  3. the matter gets heavier

  4. the matter condenses
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When matter is heated, it expands and becomes less dense. Because it is less dense than the surrounding cooler matter, it becomes more buoyant and rises.

Multiple choice metallic and electrolytic conduction electrolysis chemical reactions electrochemistry chemistry

We can expect that pure water:

  1. will not normally conduct electricity

  2. will normally conduct electricity

  3. slightly conduct electricity

  4. completely conduct electricity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water has very low ionisation constant so it dissociates very low and pure water  consists almost entirely of molecules; as no of ions are very less in pure water so normally it will not conduct electricity.