51. What is the atomic number of mercury?
52. Which of the following molecules has a bond order of 2.5?
53. An element of atomic no. 29 belongs to
54. Which metal is the heaviest in periodic table among the following ?
55. Ruby and sapphire are oxides of
56. The chemical name of quartz is
57. What is the most common salt in sea water ?
58. Fertiliser having high nitrogen content is :
59. Which one of the following is found in kidney stones?
60. Which one of the following is not present in cement ?
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