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Chemistry

Chemistry
Threshold limit value of copper in the atmospheric air is

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

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Chemistry
The pH of lemon juice is expected to be

Equal to 7
Nothing can be predicted
Less than 7
More than 7

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Chemistry
Nitrogen in water is commonly found in the form of

Nitrite
Nitric oxide
Nitrate
Nitrous oxide

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Chemistry
Periodic table contains how many periods

8
10
7
6

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Chemistry
In organic compounds, nitrogen is estimated by

Liebig's method
Carius method
Victor-Meyer's method
Dumas method

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Chemistry
Silicon is used in

Solar energy devices
Semiconductors
All of these
Transistors

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