31. What is the percentage of oxygen in Al2(SO4)3?
32. What are the two chemicals used in black and white photography?
33. Which compound is produced when magnesium ribbon is burn in air?
34. Which of the following is used in making ointment for curing skin disease?
35. Which process is used for the purification of impure metals such as oxide of metals?
36. Which of the following metals is most malleable?
37. If a metal of an alloy is mercury, it will be called a . . . . . . . .
38. In which of the following processes, zinc oxide is formed, which acts as a protection layer and prevents corrosion?
39. Which one of the following is used for water softening?
40. Which one of the following pairs of metals constitutes the lightest metal and the heaviest densest metal, respectively?
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