Chemistry Set 16 FAQs

1. The pH of a neutral solution is:

2. The most ductile metal is:

3. Unlike hydrochloric acid, which is completely ionised, carboxylic acids are:

4. The strength of interparticle attractions depends on:

5. Methane is a major component of bio-gas and:

6. Consider the following statements about the gases collected on passing electricity through water: (I) Hydrogen burns with a pop sound. (II) A burning candle glows brighter in oxygen. (III) Both gases collected are water vapour. Which of the above is/are correct?

7. Rusting of iron requires the presence of:

8. Iron nails dropped in sawdust can be separated using:

9. Detergents are usually used to make:

10. The particle size in a colloid is:

11. Which of the following is practically incompressible?

12. Which of the following polyatomic ions has a valency of 2?

13. The shining surface of metals in their pure state is called:

14. At room temperature, the mass of 1 mL of water is close to:

15. The gas usually liberated when an acid reacts with a metal is:

16. 12 g of carbon combines with 32 g of oxygen to form 44 g of carbon dioxide. The mass of carbon dioxide formed when 3.6 g of carbon reacts completely is:

17. Lime water is a solution of:

18. The first international conference on chemistry, held in 1860, took place at:

19. Substances that turn blue litmus paper red are:

20. In a separating funnel containing mustard oil and water, the layer collected at the top is:

21. The extraction of metals from their ores and then refining them is known as:

22. Assertion (A): Solutions do not exhibit the Tyndall effect. Reason (R): The particles in a solution are smaller than 1 nm in diameter.

23. The scientist known as the Father of Modern Chemistry is:

24. In the reaction 2HgO → 2Hg + O₂, mercuric oxide undergoes:

25. Using the data below, the mass of potassium nitrate needed to prepare a saturated solution in 50 g of water at 40 °C is:

26. Consider the following statements: (I) The density of a substance is independent of its shape or size. (II) The density of a substance depends on temperature and pressure. (III) Pressure significantly affects the density of solids and liquids. Which of the above is/are correct?

27. The simplest whole number ratio of the various atoms present in a compound is represented by its:

28. Pure substances are classified into:

29. Aqua regia is a freshly prepared mixture of concentrated HCl and concentrated HNO₃ in the ratio:

30. Which of the following elements has atoms, rather than molecules, as its constituent particles?