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66. A solution turns red litmus blue, its pH is likely to be (NTSE Jharkhand, Stage-I, 2016-17)
1
4
5
10
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67. The chemical formula of Plaster of Paris is (NTSE Madhya Pradesh, Stage-I, 2016-17)
Calcium Sulphate [CaS04]
Calcium Sulphate Hemihydrate [CaS04 1/2H20]
Barium Sulphate [BaS04]
None of these
68. When CO2 gas is passed through lime water, the solution turns milky, this is due to the formation of (NTSE Tamil Nadu, Stage-I, 2016-17)
CaC03
CaO
Ca(HC03)2
Ca(OH)2
69. Which of the following is pH of basic solution? (NTSE Rajasthan, Stage-I, 2016-17)
7
4.2
6.9
10.2
70. Which reagent is able to dissolve gold and platinum? (NTSE Rajasthan, Stage-I, 2016-17)
Nitric acid
Aqua-regia
Hydrochloric acid
Sulphuric acid
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