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

What happens to enzymes at low temperature?

  1. They get inactivated.

  2. They get over activated.

  3. They remain unaffected.

  4. They get denatured.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Enzymes have a particular optimum range of working temperature, below which their activity decreases.

Multiple choice

Purest form of water is

  1. River water

  2. Sea water

  3. Rain water

  4. Tube-well water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rain water is considered the purest natural form of water because it evaporates from water bodies, leaving most impurities behind, and condenses as relatively pure water. River water contains dissolved minerals and pollutants, sea water is salty, and tube-well water contains dissolved minerals from underground. Rain water has the least mineral content and contaminants.

Multiple choice

A different chemical substance is formed when

  1. A cloth is cut

  2. A glass breaks

  3. A piece of chalk falls down

  4. A candle burns
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Burning a candle is a chemical change because wax reacts with oxygen to form new substances (carbon dioxide and water vapor). The other options involve physical changes - cutting cloth changes only shape, breaking glass changes only form, and chalk falling changes only position. In a chemical change, new substances with different properties are formed.

Multiple choice

Which of the following components is not recycled in nature?

  1. Nitrogen

  2. Water

  3. Sodium

  4. Carbon

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nitrogen, water, and carbon all have complete biogeochemical cycles in nature where they are continuously recycled through the atmosphere, organisms, and environment. Sodium does not have a significant cycle - it enters ecosystems through weathering of rocks but doesn't recycle in the same continuous way as the major biogeochemical cycles.

Multiple choice

What is a homogeneous mixture

  1. binary solution

  2. components are in the same phase

  3. mixture of a gas and liquid

  4. a solution containing more than two components
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

ANS.  2.

Multiple choice

Crystallisation is possible only in

  1. a saturated solution

  2. a binary mixture

  3. an unsaturated solution

  4. the solution of solute and solvent are in equal amount
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

ANS.  1.

Multiple choice

The solubility of a liquid in a liquid

  1. increases with increase in pressure

  2. decreases with increase in pressure

  3. always increase with increase in temperature

  4. is not affected by pressure
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

ANS.  4.

Multiple choice

Solubility of a gas in a liquid

  1. decreases with increase in temperature

  2. increases with increase in temperature

  3. is not affected by temperature

  4. increases with decrease in pressure
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solubility of a gas in a liquid decreases with increase in temperature.

Multiple choice

Rault's law is for

  1. a gas-liquid solution

  2. a liquid-liquid solution

  3. for all type of solutions

  4. a liquid-liquid and solid-liquid solution
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Option 4 is the correct answer.