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

Which of the following options is the process to change liquid into solid?

  1. Evaporation

  2. Freezing

  3. Sublimation

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

Freezing is the phase transition from liquid to solid state, occurring when a liquid is cooled below its freezing point. Evaporation is liquid to gas, sublimation is solid to gas (skipping liquid). Freezing is the correct answer.

Multiple choice

Which of the following liquids has the highest density?

  1. Water

  2. Mercury

  3. Alcohol

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

Mercury is the densest liquid at room temperature with a density of approximately 13.5 g/cm³. Water has a density of 1 g/cm³, while alcohol is even less dense (around 0.79 g/cm³ for ethanol). This makes mercury significantly heavier than the other options.

Multiple choice

How much our body contains about water by mass?

  1. 65%

  2. 70%

  3. 80%

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

The human body contains approximately 70% water by mass. Water is essential for various biological processes including temperature regulation, waste removal, and nutrient transport. Different tissues have varying water content - blood is about 92% water, while bones contain about 22% water.

Multiple choice

Dry ice is

  1. super-cooled ice.

  2. solid water with zero humidity.

  3. solid carbon dioxide.

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

Solid carbon dioxide is known as dry ice.

Multiple choice

Lignin is a very______ substance.

  1. hard

  2. strong

  3. soft

  4. both (1) and (2)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lignin is a complex organic polymer that makes cell walls both hard (rigid) and strong (resistant to compression and deformation). It provides structural support and waterproofing to plant cell walls, especially in xylem tissue. The option 'both (1) and (2)' correctly captures both of these properties.

Multiple choice

Fruit juice is

  1. a true solution

  2. a homogeneous mixture

  3. a heterogeneous mixture

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

Ans : 4.