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Chemistry

Chemistry
Which amidst the following is not a gem stone ?

Pearl
Cat's-eye
Opal
Topaz

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Chemistry
Basicity of boric acid, H3BO3 is

4
2
3
5

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Chemistry
Threshold limit value of copper in the atmospheric air is

0.001 mg/m3
0.01 mg/m3
5.0 mg/m3
1.0 mg/m3

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Chemistry
The function of skimming tank in sewage treatment is to remove

Gritty substances
Suspended solids
Inorganic substances
Oil and fatty substances

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Chemistry
Which one of the following contains maximum percentage of carbon ?

Cast iron
High speed steel
Wrought iron
Stainless steel

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Chemistry
The most extensive, commercially useful source of thorium as monazite sand occurs in India at

Gujarat coast
Orissa coast
West Bengal coast
Travancore coast

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