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Chemistry

Chemistry
Which one is not a primary greenhouse gases in the Earth's atmosphere

Ozone
Nitrogen
Methane
Carbon dioxide

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

All of these
O3
CO
CO2

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Chemistry
The two metal ions that cause hardness to water are:

Calcium, Magnesium
Sodium, Magnesium
Sodium, Potassium
Sodium, Calcium

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Chemistry
The important metal used with iron to produce stainless steel is

Tin
Carbon
Aluminium
Chromium

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Chemistry
Which of the following contains high content of lead?

Cooking gas
High octane fuel
Low octane fuel
Coal

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Chemistry
White coal is

None of these
Diamond
Hydro-electricity
Uranium

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