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 physics the kinetic model of matter evaporation heat, internal energy and work phase change

Statement-1
Evaporation takes place from the surface of a liquid.
Statement-2
The molecules at the surface have less attractive energy than those inside the liquid.

  1. Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation for Statement- 1

  2. Statement-1 is true, Statement-2 is true but Statement-2 is not the correct explanation for Staement-1

  3. Statement-1 is true, Statement-2 is false.

  4. Statement-1 is false, Statement-2 is true.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Evaporation is a surface phenomenon.
Particles present on the surface of a liquid only face attraction from one side (the side containing fluid particles) and surface tension. Where as particles inside the liquid would face attractive forces from all around, making it difficult for such particles to evaporate or escape.
Hence the statement is true, explanation is true and the explanation is the correct explanation for the statement.

Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

Which of the following statement is wrong ?

  1. At room temperature evaporation of water is rapid as compared to ethanol

  2. Water is more viscous as compared to ethanol

  3. Liquid drops are spherical in shape

  4. Clothes are easily dried in dry day as compared to humid days
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

A: At room temperature evaporation of ethanol is rapid as compared to water. Hence, A is incorrect. 

B: water is more viscous compared to ethanol, hence statement is true. 
C: liquid drops are spherical due to surface tension of liquid drop,hence statement is true.
D: Clothes are dried easily as it is less humid on dry day,hence statement is true. 

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

Which of the following is true regarding density?

  1. Diethyl ether has higher density than water.

  2. Diethyl ether has lower density than water.

  3. Diethyl ether is as dense as water.

  4. The density of diethyl ether depends on its method of preparation.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diethyl ether has lower density than water. The density of diethyl ether is 713 kg/m$^3$. The density of water is 1000 kg/m$^3$.
Water molecules are closer to each other than the molecules of ether. This is due to intermolecular hydrogen bonding in water which is not possible in diethyl ether.

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.