Sets
Chemistry Set 9
30 questions 1. The method of arranging objects into groups on the basis of a common property is called:
2. Detergents are generally sodium salts of:
3. Substances whose odour changes in acidic or basic media are called:
4. A homogeneous mixture of two or more metals, or a metal and a non-metal, is called:
5. Consider the following pairs:
(I) Rusting – Chemical change
(II) Melting of ice – Physical change
(III) Burning of magnesium – Physical change
Which of the pairs given above is/are correctly matched?
6. The reddish brown coating on iron articles is called:
7. Carbon monoxide contains carbon and oxygen in the mass ratio of 3:4. The mass of oxygen that combines with 6 g of carbon is:
8. A metal block has a mass of 468 g and a density of 7.8 g/cm³. Its volume is:
9. 20 mL of a liquid pesticide is mixed with water to make 250 mL of spray. Its volume by volume percentage is:
10. The gold generally used for making ornaments in India is:
11. The bond between the two oxygen atoms in an oxygen molecule is a:
12. One litre is equivalent to:
13. Substances capable of adding oxygen to other substances are called:
14. Each half reaction in a redox process explicitly shows the involvement of:
15. Dust particles suspended in air are considered:
16. Ionic compounds are generally insoluble in:
17. Which pair of metals will melt if kept on the palm?
18. The brown fumes emitted on heating lead nitrate are of:
19. Compared with covalent compounds, ionic compounds generally have:
20. Solder, used for welding electrical wires together, is an alloy of: