Sets
Chemistry Set 1
30 questions 1. A base that dissolves in water is called:
2. In Dhokra art, the hollow space of the clay mould is filled with molten:
3. Bleaching powder is produced by the action of chlorine on:
4. In a hydrocarbon chain, the element replacing hydrogen is referred to as a:
5. Dry ice, used for ice cream storage, is:
6. If the K-shell is the outermost shell, the number of electrons that makes the atom stable is:
7. Toothpastes used to prevent tooth decay are generally:
8. Consider the following statements:
(I) The properties of a compound are different from those of its constituent elements.
(II) Elements are present in a compound in a fixed and definite ratio.
(III) The compound formed by hydrogen and oxygen is a gas.
Which of the above is/are correct?
9. The process of beating harvested stalks to separate grains from them is called:
10. A sodium atom on losing its valence electron forms:
11. When hydrogen gas is passed over heated copper(II) oxide, the black coating turns:
12. The black oxide formed when copper is heated in air is:
13. The formula unit mass of magnesium oxide (Mg = 24 u, O = 16 u) is:
14. Synthetic diamonds are prepared by subjecting pure carbon to:
15. Aluminium oxide reacts with sodium hydroxide to form water and:
16. At ordinary temperature, the surface of which of the following metals is covered with a protective layer of oxide?
17. Which of the following ionic compounds has the highest melting point?
18. Mishraloha was the name given to a mixture of:
19. In the balanced equation 3Fe + 4H₂O → Fe₃O₄ + 4H₂, the coefficient of H₂ is:
20. Erosion of rocks by flowing water and wind is a: