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 hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

With increase in the molecular weight, what happens to the density of ethers?

  1. Increases

  2. Decreases

  3. remains same

  4. cannot be predicted
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

With the increase in the molecular weight, the density of ethers increase.
For example, diethyl ether has a lower density than dibutyl ether.
The density of diethyl ether is 713 kg/m$^3$.
The density of dibutyl ether is 769 kg/m$^3$.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers
Ether is less soluble in water than alcohol.

  1. True

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

Ethers have oxygen attached to two alkyl groups ($R-\overset { .. }{ \underset { ^{ .. } }{ O }  } -R'$). Therefore, due to the high electronegativity of oxygen, it can form hydrogen-bond with water molecules similar to alcohol. But due to the absence of $H$ on $O$ of ether, they can only act as hydrogen bond acceptor (unlike alcohols) and thus have lower solubility in water than alcohols with similar molecular weight.

Multiple choice chemistry hydroxy compounds and ethers physical properties of ethers ethers alcohols, phenols and ethers

Ether which is liquid at room temperature is:

  1. $C _2H _5 - O - CH _3$
  2. $CH _3 - O - CH _3$
  3. $C _2H _5 - O - C _2H _5$

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

Dimethyl ether (CH3-OCH3) is a gas at room temperature (bp -24 C). Ethyl methyl ether (C2H5-OCH3) has a boiling point of about 7-8 C, making it a volatile liquid at room temperature. Diethyl ether (C2H5-OC2H5) is also a liquid, but the question implies identifying a specific example.

Multiple choice chemistry air and water pollution control smoke, dust and other air pollutants, acid rain air pollutants and its effects air and air pollution

HF is stored in which container?

  1. Tin container

  2. Borosilicate glass

  3. Plastic bottle

  4. Stainless steel container
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Because of its high reactivity toward glass and moderate reactivity toward many metals, hydrofluoric acid is usually stored in plastic containers (although PTFE is slightly permeable to it).

Multiple choice chemistry study of the first element - hydrogen position of hydrogen in the periodic table hydrogen in periodic table trends in groups and periods

Hydrogen is mainly found in the combined state like in water and not the free state.

  1. True

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

The earths crust contains nearly 1% hydrogen by weight. In free state($H _2$), it occurs only in traces in the atmosphere. It is mainly found in the combined state and not the free state. Important sources are water, acids, organic matter etc.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation upthrust is equal to the weight of displaced liquid pressure in fluids buoyancy

A piece of ice having a stone frozen in its melts in a glass vessel filled with water. How will the level of water in the vessel change when the ice melts?

  1. The level will rise

  2. The level will not change

  3. The level will drop

  4. Some water will flow out
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the ice melts, the stone sinks and the ice becomes water. The volume of water displaced by the ice (floating) is equal to the weight of the ice. Once melted, the water occupies less volume than the ice did, causing the level to drop.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation upthrust is equal to the weight of displaced liquid pressure in fluids buoyancy

An ice block contains a glass ball when the ice melts within the water containing vessel, the level of water

  1. Rises

  2. Falls

  3. Unchanged

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

When the ice melts, the water level depends on the density of the object inside. Since the glass ball is denser than water, it displaces more water when it is part of the floating ice than it does when it sinks to the bottom after the ice melts, causing the level to fall.

Multiple choice botany water absorption and ascent of sap in plants factors affecting the transport of water and minerals in plants ascent of sap long distance transport of water

Rate of water absorption is slow near freezing point because 

  1. Water absorption is a metabolic process

  2. Cell growth stops

  3. Transpiration is reduced

  4. Cell membrane become more viscous
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rate of water absorption is slow near a freezing temperature because decreased temperature results in the decreased root growth. Also, freezing temperature makes the cell membrane more viscous. There is resistance in water absorption as permeability of cell membrane decrease and viscosity increases.  

Thus, the correct answer is option D.

Multiple choice physics heat - measurement introduction to temperature application of various thermometric scales different types of thermometers

Two glass tumblers have been stuck together (one into the other). They can be seperated by

  1. Placing hot water in the inner tumbler

  2. Placing the tumblers in cold water

  3. Placing the outer tumbler in hot water

  4. Hamming them vigorously
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The correct answer is option(C).

They can be separated by placing cold water in inside tumbler and placing the outer tumbler in hot water. This way it creates a temperature difference and the glass tumblers get separated easily.

Multiple choice chemistry fibre to fabric: plant fibre classification of fibres fibres history of fabric

Which of the following can define molecules in the liquid state?

  1. Molecules vibrating in a fixed position and held in place by strong forces

  2. Molecules can rotate and roll over each other because the forces are moderately strong

  3. Molecules can move anyway in random because there are no forces holding the molecules together

  4. A state of matter which contains only charged particles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In liquid, particles are loosely bound together by intramolecular forces. Unlike a solid, liquid has no fixed shape but instead has a characteristic readiness to flow and therefore takes on the shape of any container.

Forces between them are moderately strong as compare to solid.

Hence, option $B$ is correct. 

Multiple choice chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

What is meant by sublimation?

  1. Conversion of solid into liquid on heating

  2. Conversion of solid into gas on heating

  3. Conversion of liquid into gas on heating

  4. Change of shape of solid on heating
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. Sublimation is easier for volatile materials which can be evaporated at low temperatures.


Hence, the correct option is $B$

Multiple choice chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

The change of solid into vapours on heating and of vapours into solid on cooling is called :

  1. sublimation

  2. condensation

  3. distillation

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

There are many substances which are converted into gas from solid when heated, and converted from gas to solid when cooled without converting into liquid. Such substances are known as sublime and the proce3wss is called sublimation.

Multiple choice chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

Which of the fractions will be present maximum in precipitate?

  1. Least soluble substance

  2. Most soluble substance

  3. Both of the above

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

The component which is less soluble will get precipitated out and settle at the bottom and other component which is more soluble will remain in the solution

so, the least soluble substance will be maximum in precipitate.