31. . . . . . . . . is the most commonly found metal on Earth.
32. With which substance does silver react and turn black?
33. The molecular formula of quicklime is . . . . . . . .
34. Copper metal is immersed in a mixture of zinc sulphate, then . . . . . . . .
35. . . . . . . . . metal melts on our palm.
36. Which one of the following does not contain silver?
37. On heating gypsum at 373K, it loses water molecules and becomes calcium sulphate hemihydrate. This substance is used to make toys, material for decoration and smooth surfaces. What is this substance commonly known as?
38. Give an example of a metal which can be easily cut with a knife.
39. Which of the following is the electron configuration of a metallic element?
40. The chemical name for "caustic soda" is:
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