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

Which of the following statements is incorrect?

  1. Sand settles down in water.

  2. Vinegar dissolves in water.

  3. Sugar and water make a transparent solution.

  4. Oil mixes well with water.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sand is heavier than water and settles down at the bottom. Vinegar and sugar both are water-soluble, but oil is lighter than water and floats on the surface.  

Multiple choice

Which of the following materials sinks in water?

  1. Wax

  2. Sawdust

  3. Sand

  4. Oil
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Only those materials sink in water which are insoluble and are heavier than water, e.g. sand, soil etc. Oil and sawdust are lighter than water and remain at the surface. 

Multiple choice

Which of the following materials is insoluble in water?

  1. Sugar

  2. Sawdust

  3. Vinegar

  4. Salt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Vinegar, salt and sugar get easily dissolved in water and are said to be water soluble. Sawdust remains separate when added to water and is said to be water insoluble. 

Multiple choice

Which of the following is true solution?

  1. Milk

  2. Blood

  3. Salt solution

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

A true solution is a homogeneous mixture where the solute particles are dissolved completely in the solvent. Salt solution is a classic example of a true solution, whereas milk and blood are colloids.

Multiple choice

Sulphur is soluble in

  1. water

  2. carbon disulphide

  3. both (1) & (2)

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

Sulphur is a non-polar substance and is insoluble in polar solvents like water. It is highly soluble in non-polar organic solvents such as carbon disulphide.

Multiple choice

Which of the following conducts electricity?

  1. Distilled water

  2. Rain water

  3. Glucose solution

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

Rain water contains dissolved atmospheric gases and salts, which provide ions that allow it to conduct electricity. Distilled water and glucose solution lack these ions.

Multiple choice

The scientific principle behind the working of pressure cookers is that the

  1. boiling point depends upon pressure

  2. radiation lowers the temperature

  3. radiation increases the temperature

  4. pressure depends upon the boiling point
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pressure cooker works by increasing the pressure inside the vessel. This increased pressure raises the boiling point of water, allowing the food to be cooked at a higher temperature than it would be in an open pot.

Multiple choice

Which of the following does not conduct electricity?

  1. Distilled water

  2. Diluted hydrochloric acid

  3. Diluted sulphuric acid

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

Distilled water is pure H2O and lacks the dissolved ions (electrolytes) necessary to conduct electricity. Acids like HCl and H2SO4 dissociate into ions, making them good conductors.

Multiple choice

Which of the following aqueous solution conducts electricity?

  1. Glucose

  2. Hydrochloric acid

  3. Ethyl alcohol

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

Aqueous solutions conduct electricity if they contain ions. Hydrochloric acid (HCl) dissociates into H+ and Cl- ions in water, allowing it to conduct electricity, whereas glucose and ethyl alcohol are covalent compounds that do not ionize.