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Chemistry

Chemistry
Percentage of lead in lead pencils is

80
40
31-66

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Chemistry
Which of the following elements is found in all organic compounds

Carbon
Nitrogen
Oxygen
Calcium

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Chemistry
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is

CO
O3
CO2
All of these

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Chemistry
In which of the following ions , the colour is not due to d-d transition ?

[Cu(NH3)4]2+
[CoF6]3+
[Ti(H2O)6]3+
[CrO4]2−

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Chemistry
The gas that usually causes explosions in coal mines is

Hydrogen
Carbon monoxide
Methane
Air

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Chemistry
Which of the following metals is not a pollutant ?

Mercury
Arsenic
Lead
Aluminium

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MORE MCQ ON Chemistry

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