📌 Topics for MCQs – Chapter 1 (States of Matter and Phase Changes)
MCQs in board exams are mostly based on these topics:
1. What is Chemistry?
Chemistry is the study of: (a) Matter (b) Energy (c) Both (d) None
Chemistry deals with: (a) Composition (b) Structure (c) Changes (d) All of these
2. Branches of Chemistry
Which branch deals with carbon compounds? (a) Organic (b) Inorganic (c) Physical (d) Analytical
Which branch deals with the nucleus? (a) Nuclear (b) Biochemistry (c) Environmental (d) Polymer
Which branch deals with living organisms? (a) Biochemistry (b) Physical (c) Inorganic (d) Organic
3. States of Matter
Which state has definite shape and volume? (a) Solid (b) Liquid (c) Gas (d) Plasma
Which state has no definite shape but definite volume? (a) Liquid (b) Solid (c) Gas (d) Plasma
Which state has the strongest intermolecular forces? (a) Solid (b) Liquid (c) Gas (d) Plasma
Which state is easily compressible? (a) Gas (b) Liquid (c) Solid (d) None
4. Phase Changes
Solid → Liquid is called: (a) Melting (b) Freezing (c) Evaporation (d) Condensation
Liquid → Solid is called: (a) Freezing (b) Melting (c) Evaporation (d) Sublimation
Liquid → Gas is called: (a) Evaporation (b) Condensation (c) Sublimation (d) Freezing
Solid → Gas is called: (a) Sublimation (b) Evaporation (c) Condensation (d) Melting
Gas → Liquid is called: (a) Condensation (b) Evaporation (c) Sublimation (d) Freezing
5. Elements, Compounds, and Mixtures
Which is a pure substance? (a) Compound (b) Mixture (c) Both (d) None
Which is a compound? (a) Water (b) Air (c) Soil (d) Milk
Which is a mixture? (a) Air (b) Water (c) NaCl (d) CO₂
Which has a fixed composition? (a) Compound (b) Mixture (c) Both (d) None
6. Allotropic Forms
Diamond is an allotrope of: (a) Carbon (b) Oxygen (c) Sulphur (d) Nitrogen
Graphite is an allotrope of: (a) Carbon (b) Oxygen (c) Sulphur (d) Nitrogen
Ozone is an allotrope of: (a) Oxygen (b) Carbon (c) Sulphur (d) Nitrogen
Fullerene (C₆₀) is an allotrope of: (a) Carbon (b) Oxygen (c) Sulphur (d) Nitrogen
7. Solution, Colloid, and Suspension
Which shows the Tyndall effect? (a) Colloid (b) True solution (c) Both (d) None
Particle size in a true solution is: (a) < 1 nm (b) 1-100 nm (c) > 100 nm (d) None
Particle size in a colloidal solution is: (a) 1-100 nm (b) < 1 nm (c) > 100 nm (d) None
Which is a colloidal solution? (a) Milk (b) Salt solution (c) Muddy water (d) Sugar solution
Which is a suspension? (a) Muddy water (b) Salt solution (c) Milk (d) Sugar solution
8. Saturated and Unsaturated Solutions
A solution that can dissolve more solute is: (a) Unsaturated (b) Saturated (c) Supersaturated (d) Dilute
A solution that cannot dissolve more solute is: (a) Saturated (b) Unsaturated (c) Supersaturated (d) Concentrated
A solution with more solute than normal is: (a) Supersaturated (b) Saturated (c) Unsaturated (d) Dilute
9. Effect of Temperature on Solubility
Solubility of most solids with temperature: (a) Increases (b) Decreases (c) Remains same (d) None
Solubility of gases with temperature: (a) Decreases (b) Increases (c) Remains same (d) None