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 nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

The bottles of liquid ammonia are opened after cooling them in ice for sometime. It is because liquid ammonia :

  1. has high vapour pressure at room temperature

  2. is corrosive liquid

  3. is an explosive

  4. brings tears in eyes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Liquid ammonia has hydrogen bonding which results in high vapour pressure at room temperature.


The vapour pressure of ammonia at room temperature is very high and hence the ammonia will evaporate unless the vapour pressure is decreased. 

Cooling decreases the vapour pressure so that the liquid remains in the same state. Hence, the bottle is cooled before opening.

Option A is correct.

Multiple choice chemistry nitrogen and sulfur ammonia-properties and uses ammonia compounds of nitrogen - ammonia

Statement 1: $NH _{3}$ can be best collected by water displacement.

Statement 2: $NH _{3}$ is a polar substance.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct</p>
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen, oxygen and hydrogen can be collected by water displacement because they are only slightly soluble in water. But hydrogen chloride or ammonia can not be separated since both are very highly soluble in water and will react to form hydrochloric acid or ammonium hydroxide respectively so statement 1 is not true.

$NH _3$ is a polar substance so statement 2 is correct.

Multiple choice

In which medium are mechanical wave speeds typically faster?

  1. solids

  2. liquids

  3. gases

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

Mechanical waves travel fastest in solids because particles are closest together and have stronger intermolecular bonds, enabling more efficient energy transfer. The tightly-packed structure of solids allows waves to propagate with minimal energy loss compared to liquids or gases.

Multiple choice

Which of the following is NOT considered a fluid?

  1. rivers

  2. oxygen

  3. syrup

  4. sand
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A fluid is any substance that can flow and take the shape of its container. Rivers (liquid), oxygen (gas), and syrup (viscous liquid) are all fluids, while sand is a solid granular material.

Multiple choice

Blood is a type of a ...

  1. solute

  2. solvent

  3. suspension

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

Blood is considered a suspension because it contains cells and platelets suspended in plasma, which can settle out over time.