51. There is no reaction when steam passes over
52. An alloy of lead & tin is called:
53. Food cans are coated with tin but not with zinc because
54. What is the chemical formula of Plaster of Paris?
55. Zinc is used to protect iron form corrosion because zinc is
56. On providing heat, the decomposition of calcium carbonate into calcium oxide and carbon di-oxide, is example of . . . . . . . .?
57. How many water molecules are present in a molecule of washing soda?
58. Which of the following metals is the best conductor of electricity?
59. Calcium sulphate hemihydrate is also known as:
60. Which of the following elements has the lowest melting point?
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