Sets
Chemistry Set 10
30 questions 1. The Law of Constant Proportions was proposed by:
2. Consider the following pairs:
(I) Roasting – Strong heating of sulphide ores in excess air
(II) Calcination – Strong heating of carbonate ores in limited air
(III) Roasting – Strong heating of carbonate ores in limited air
Which of the pairs given above is/are correctly matched?
3. The names suggested by discoverers for new elements are ratified by:
4. In a chemical reaction, 8 g of substance A reacts completely with 6 g of substance B to form substances C and D. If 9 g of C is formed, the mass of D formed is:
5. Which pair consists of amphoteric oxides?
6. The reaction of an ester with sodium hydroxide to give an alcohol and the sodium salt of a carboxylic acid is called:
7. The reaction of methane with chlorine takes place rapidly in the presence of:
8. A grain of potassium permanganate spreads the fastest in:
9. The formula unit mass of magnesium nitrate, Mg(NO₃)₂ (Mg = 24 u, N = 14 u, O = 16 u), is:
10. Consider the following statements:
(I) Below the boiling point, vapour formation occurs only at the surface.
(II) Evaporation takes place only at the boiling point.
(III) Evaporation is a slower process than boiling.
Which of the above is/are correct?
11. The number of properties (guṇa) used in Ayurveda to describe all physical matter is:
12. Consider the following statements about Dalton's postulates:
(I) Atoms of a given element are identical in mass and chemical properties.
(II) Atoms of different elements have the same mass.
(III) Atoms combine in the ratio of simple whole numbers to form compounds.
Which of the above is/are correct?
13. Obtaining a metal from its oxide involves:
14. Graphene aerogel, said to be the lightest material on earth, is made from:
15. Any reaction that produces a precipitate is called a:
16. Different forms of the same element, such as diamond and graphite, are called:
17. Which of the following is a metalloid?
18. Common salt is obtained from seawater by:
19. Consider the following pairs:
(I) Ethane – C₂H₆
(II) Ethene – C₂H₄
(III) Ethyne – C₂H₄
Which of the pairs given above is/are correctly matched?
20. According to the IUPAC recommendation, the groups of the periodic table are numbered from 1 to: