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 chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

Warming ammonium chloride with sodium hydroxide in a test tube is an example of:

  1. closed system

  2. isolated system

  3. open system

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

When we are warming ammonium chloride with sodium hydroxide in a test tube, there is exchange of heat as well as mass between system and surrounding. Mass is transferred from the open end of the test tube due to evaporation. Also heat is being exchanged through the walls of test tube.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

In a closed insulator container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true?

  1. $\triangle U=w\neq O,q=O$
  2. $\triangle U=w=q\neq O$
  3. $\triangle U=O,w=q\neq O$
  4. $w=O,\triangle U=q\neq O$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A closed insulated container, a liquid is stirred with a paddle to increase the temperature, therefore it behave as adiabatic system, $q=0$

$\Delta U=q+w$
$\implies \Delta U=w\neq 0$

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

A well stoppered thermoflask contains some ice cubes. This is an example of:

  1. closed system

  2. open system

  3. isolated system

  4. non-thermodynamic system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A thermoflask is designed to prevent the exchange of heat (energy) and matter with the surroundings, making it an isolated system. However, in many textbook contexts, if it is 'well-stoppered' but not perfectly insulated, it is often treated as a closed system regarding matter.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

When a volatile liquid is introduced into an evacuated closed vessel at a particular temperature, both evaporation and condensation take place simultaneously. The system reaches equilibrium state when:

  1. the liquid is completely transformed into the corresponding vapour

  2. equal amounts of liquid and vapour are present in the system

  3. the rate of evaporation becomes equal to the rate of condensation

  4. liquid cannot be converted into vapour and vice versa.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Solution:- (C) The rate of evaporation becomes equal to the rate of condensation
As we know that the equilibrium in a system is established when rate of forward reaction is equal to the rate of backward reaction.
Hence the rate of evaporation becomes equal to the rate of condensation.
Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

A well stoppered thermos flask contains some ice cubes. This is an example of:

  1. closed system

  2. open system

  3. isolated system

  4. non-thermodynamic system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An isolated system is a thermodynamic system that can not exchange either energy or matter outside the boundaries of the system.

Thus, a well stopped thermos flask containing ice an example for isolated system.

Multiple choice chemistry chemical thermodynamics system and surroundings introduction to thermodynamics basics of thermodynamics

Select the correct statements.

  1. State of a system is assumed to be in internal equilibrium and the temperature and pressure are uniform throughout the system.

  2. Thermal drift in a system with time is more in Dewar flask than in insulated system.

  3. Thermal drift in a system with time is more in non-insulated system than in insulated system.

  4. Thermal drift in a system with time is more in insulated system than in non-insulated system.
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production
A test tube containing molasses solution and yeast is kept in a warm place overnight. The gas collected from this mixture

  1. Extinguishes the flame

  2. Bursts into flame when ignited

  3. Turns lime water milky

  4. Both (a) and (c)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Yeast do anaerobic fermentation by consuming sugar and forming ethanol and $CO _2$.  As Molasses mainly contain sugar, yeast will do anaerobic fermentation of the molasses and forms $CO _2$ gas as a by-product. 
This $CO _2$ gas can (i) extinguishes the flame, and (ii) Turns lime water milky.
So, the correct answer is (D).
Multiple choice evs eat when you need food poisoning and food preservation methods food spoilage, adulteration and preservation food spoilage and adulteration

Pasteurisation is?

  1. Heating of liquid at $65^o$C
  2. Heating of liquid between $65^o$ - $80^o$C followed by rapid cooling
  3. Heating of solids at $65^o$C

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

Pasteurization is a process in which milk is heated at high temperatures (65 degree celsius approx) followed by rapid cooling to kill pathogenic bacteria.

Correct answer-B

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Microspheres resemble living beings in their ability to :

  1. Assimilate chemicals

  2. Grow

  3. Divide

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

Microspheres (or proteinoid microspheres) are abiotic structures that exhibit properties like growth, division, and the ability to maintain internal chemistry, which are precursors to cellular life.

Multiple choice nuclear reactions nuclear structure nuclei atomic nuclei physics

If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should

  1. increase

  2. remain unchanged

  3. decrease

  4. first increase then decrease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Because thermal energy decreases, therefore mass should increase.

Multiple choice nuclear reactions nuclear structure nuclei atomic nuclei physics

If mass-energy equvalence is taken into account, when water is cooled to form ice, the mass of ater should

  1. Increase

  2. Remain unchanged

  3. decrease

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

As we know that when water is converted into ice then it releases 

energy to the atmosphere, in other words, it can be said that
 it releases some mass to the atmosphere because mass and 
energy are equivalent. 
So option C is correct that mass will decrease.

Multiple choice evs experiments with water water and its types hard and soft water what floats - what sinks

A sample of water which starts lathering with soap solution on boiling is called temporary hard water.

  1. True

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

A temporary hard water can from lather with soap. The ${ Ca }^{ 2+ }/{ Mg }^{ 2+ }$ ions of water displace ${ Na }^{ + }$ or ${ K }^{ + }$ ions from this salts & form insoluble $Ca/Mg$ salts of fatty acids. 

$\because $ it is temporary hard water, lathering of soap is not that difficult.