Sets
Chemistry Set 21
24 questions 1. Consider the following pairs:
(I) Orange – Citric acid
(II) Curd – Lactic acid
(III) Tomato – Acetic acid
Which of the pairs given above is/are correctly matched?
2. Carbohydrates in rice, potatoes and bread are broken down during digestion to form:
3. The electronic configuration of the chloride ion is:
4. The black mass formed on heating a mixture of iron filings and sulfur powder is:
5. Which of the following is a combustible substance?
6. Rain water is called acid rain when its pH is less than:
7. One mole contains exactly how many elementary entities?
8. The molecular formula of propane is:
9. Baking powder is a mixture of baking soda and:
10. Iron reacts with steam to form hydrogen and:
11. The minimum temperature at which a solid melts to become a liquid at atmospheric pressure is called its:
12. The ionic end of a soap molecule is:
13. Ice floats on liquid water because, compared with water, its density is:
14. Concentrated nitric acid or sulphuric acid should be diluted by:
15. The electronic configuration of the magnesium ion (Mg²⁺) is:
16. The Periodic Law revealed important analogies among how many naturally occurring elements?
17. Assertion (A): Non-metallic oxides are acidic in nature.
Reason (R): Carbon dioxide reacts with calcium hydroxide, a base, to form a salt and water.
18. Pure gold is known as:
19. Air is a:
20. The minimum temperature at which a substance catches fire is called its: