9th class Chemistry, Chapter 1: States of Matter and Phase Changes MCQs

1. Matter is present in neon signs in the state of:

1. (A) Supercritical fluid
2. (B) Plasma ✓
3. (C) Gas
4. (D) Liquid crystal

2. Hazardous effects of shopping bags are studied in:

1. (A) Geochemistry
2. (B) Inorganic Chemistry
3. (C) Analytical Chemistry
4. (D) Environmental Chemistry ✓

3. The man-made polymer is:

1. (A) Starch
2. (B) Polystyrene ✓
3. (C) Protein
4. (D) Cellulose

4. The crystals of which substance has rhombic shape?

1. (A) Brass
2. (B) Sulphur ✓
3. (C) Graphite
4. (D) Bronze

5. Which liquid among the following is a colloidal solution?

1. (A) Milk ✓
2. (B) Slaked lime used for white wash
3. (C) Vinegar solution
4. (D) Mixture of AgCl in water

6. Which of the following is a heterogeneous mixture?

1. (A) A solution of calcium hydroxide in water
2. (B) A solution of potassium nitrate in water
3. (C) Hot chocolate
4. (D) Concrete mixture ✓

7. A state of matter whose properties are between those of liquids and crystalline solids:

1. (A) Liquid crystal ✓
2. (B) Supercritical fluid
3. (C) Plasma
4. (D) Dark matter

8. When the tiny visible particles of a substance are dispersed through a medium, the mixture is named as:

1. (A) True solution
2. (B) Colloid
3. (C) Suspension ✓
4. (D) Saturated solution

9. A solution of KClO₃ has a solubility of about 13.2 g per 100 cm³ at 40 °C. How its solubility will be affected, if you decrease the temperature?

1. (A) The solubility will increase
2. (B) The solubility will decrease ✓
3. (C) The solubility will remain the same
4. (D) The solubility will first increase with temperature and then it will decrease

10. You are studying the rate of hydrolysis of starch under different conditions of temperature. In which branch of chemistry this topic will fall?

1. (A) Organic Chemistry
2. (B) Analytical Chemistry
3. (C) Biochemistry
4. (D) Physical Chemistry ✓

11. The branch of science which deals with the properties, composition and structure of substances is:

1. (A) Biology
2. (B) Geology
3. (C) Chemistry ✓
4. (D) Physics

12. Finding out the percentages of elements and compounds in a sample of matter is called determination of its:

1. (A) Density
2. (B) Solubility
3. (C) Composition ✓
4. (D) Structure

13. Structure of matter means:

1. (A) The arrangement of atoms in matter ✓
2. (B) The percentage of elements in matter
3. (C) The mass of matter
4. (D) The volume of matter

14. Predicting and changing the rates of reactions to carry them out on industrial scale is a use of:

1. (A) Geochemistry
2. (B) Astrochemistry
3. (C) Physical Chemistry ✓
4. (D) Organic Chemistry

15. The study of elements and compounds that contain little or no carbon is called:

1. (A) Polymer Chemistry
2. (B) Inorganic Chemistry ✓
3. (C) Organic Chemistry
4. (D) Biochemistry

16. Organic chemistry deals with carbon compounds other than its simple salts like:

1. (A) Proteins and carbohydrates
2. (B) Carbonates, bicarbonates, oxides and carbides ✓
3. (C) Hydrocarbons
4. (D) Derivatives of hydrocarbons

17. The sources, reactions, effects and fates of chemical species in air, soil and water are studied in:

1. (A) Environmental Chemistry ✓
2. (B) Nuclear Chemistry
3. (C) Medicinal Chemistry
4. (D) Polymer Chemistry

18. Separation, identification and determination of the concentration of components of matter is the work of:

1. (A) Biochemistry
2. (B) Astrochemistry
3. (C) Organic Chemistry
4. (D) Analytical Chemistry ✓

19. Radioactivity and transformations in the nuclei of atoms are studied in:

1. (A) Physical Chemistry
2. (B) Analytical Chemistry
3. (C) Geochemistry
4. (D) Nuclear Chemistry ✓

20. Proteins, cellulose and nucleic acids are examples of:

1. (A) Inorganic salts
2. (B) Minerals
3. (C) Naturally occurring polymers ✓
4. (D) Man-made polymers