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 force and kinetic theory change of states phase change

Which of the following is true regarding a bucket of boiling water and a cup of boiling water.
I.The temperature of the two is the same.
II.The heat content of the two is the same.
III. The bucket of water contains more heat and is therefore hotter

  1. I only

  2. II only

  3. I and III only

  4. II and III only

  5. I, II and III only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The water is boiling In bucket and in cup, we have same liquid in bucket and cup, the water ,since the boiling point of water is  $100^{o}C$ therefore temperature is same in both .

The heat given $\Delta Q$ to the mass $m$  of substance to raise the temperature by $\Delta \theta$  is 
                          $\Delta Q=mc\Delta\theta$    where  $c$  is the specific heat of substance
The mass of water in bucket is larger therefore it has larger heat content by above relation. 
               now        $\Delta\theta=\Delta Q/mc$ 
The bucket of water contains more heat but on the other hand it also has larger mass ,therefore $\Delta Q/m$ is constant for both and hence both are at same temperature  
                          $\Delta\theta=\Delta Q/mc$ 
 here, $c$ is constant because both pots have same liquid (water) .

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

 Identify what happens to the temperature of water as it boils?

  1. It remains constant

  2. It continues to increase as long as heat is applied

  3. It increases only if the amount of heat applied is increased

  4. temperature and heat are not realted

  5. temperature and heat are related but not the same
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Temperature of a substance during its phase change remains constant. Hence when water boils, the temperature of water remains constant  i.e  $100^oC$.

Multiple choice chemistry mix and separate different types of solutions various mixtures introduction to solutions

On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid?

  1. Sugar crystals in cold water

  2. Sugar crystals in hot water

  3. Powdered sugar in cold water

  4. Powdered sugar in hot water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Powdered sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster.

Multiple choice chemistry mix and separate different types of solutions various mixtures introduction to solutions

An example of solid in non-aqueous solvent is :

  1. sugar in Ethanol

  2. blood

  3. starch

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

The solutions obtained by dissolving a solute in any solvent other than water are called non aqueous solutions (non acqueous means without water). For example, if a solute is dissolved in any solvent such as benzene, alcohol, ether, carbon, disulphide, carbon tetrachloride, acetone, etc., the solution obtained is called a non aqueous solution.
) Non Aqueous soln: Ethanol + glucose
Solid in non aqueous: Sugar in Ethanol
2) blood, starch, ink : Collidal Soln.
sugar sol., salt sol : true soln.

Multiple choice chemistry mix and separate different types of solutions various mixtures introduction to solutions

Carbon tetrachloride and benzene are:

  1. immiscible in water

  2. miscible in water

  3. both A and B

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

Carbon tetrachloride is nonpolar and will not mix with water. Benzene is also non-polar and won't mix with water at all. 


Thus, both carbon tetrachloride and benzene are Immiscible liquid.  

So, option A is correct.

Multiple choice chemistry mix and separate different types of solutions various mixtures introduction to solutions

Which describes a species in which the solvent is water?

  1. Solute

  2. Solvent

  3. Solubility

  4. Aqueous solution

  5. Solvation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An aqueous solution is a solution in which the solvent is water. It is usually shown in chemical equations by appending (aq) to the relevant chemical formula. For example, a solution of table salt, or sodium chloride (NaCl), in water would be represented as Na+(aq) + Cl-(aq).

Multiple choice chemistry mix and separate different types of solutions various mixtures introduction to solutions

A solution is defined as a :

  1. homogeneous mixture of two or more substances

  2. hetrogeneous mixture of two or more substances

  3. homogeneous mixture of liquid and solid components only

  4. homogeneous mixture consisting of water as one of the components
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A solution is defined as a homogeneous mixture of two or more substances.

Example: Salt in water

Multiple choice chemistry mix and separate different types of solutions various mixtures introduction to solutions
The phenol-water system has a upper critical solution temperature.

  1. True

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

The given statement is true.
The phenol-water system has a upper critical solution temperature.
Above this temperature, the components of phenol-water system are miscible in all proportions.
The upper critical solution temperature is an upper limit to a temperature range of partial miscibility, or miscibility for certain compositions only.

Multiple choice chemistry mix and separate different types of solutions various mixtures introduction to solutions

When some liquid evaporates, the average speed of the molecules remaining will .......... .

  1. Increase because the more energetic molecules have left

  2. Decrease because the more energetic molecules have left

  3. Remain unchanged because all molecules have about the same speed

  4. Increase because there are fewer molecules
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.

A liquid is comprised of molecules that are in constant motion, traveling at different rates. The average speed of these particles depends on the liquids temperature.  A rise in temperature increases molecular velocity as well as aggregate kinetic energy.  If molecules gain enough energy, their fast-moving particles will begin to bump against their neighbors.  Eventually, particles near the liquids surface will impart sufficient speed, and therefore sufficient kinetic energy, to cause the surface particles to propel away from the liquid in the form of gaseous molecules or, more simply, as water vapor.
As the particles with the highest kinetic energy levels evaporate, the average kinetic energy of the remaining liquid (sweat) decreases.  Because a liquids temperature is directly related to the average kinetic energy of its molecules, the liquid cools as it evaporates.
Hence, when some liquid evaporates, the average speed of the molecules remaining will decrease because the more energetic molecules have left.