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Chemistry

Chemistry
Interveinal necrotic spots on leaves appear due to

SO2injury
O3injury
HF injury
NO2injury

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Chemistry
The absolute temperature of a gas is doubled and the pressure is reduced to half, the volume of the gas

Will be reduced to half
Will be doubled
Remains unchanged
Will increase four-fold

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Chemistry
If lime water is kept in the air, it turns milky due to presence of :

Sulphurdioxide
Nitrogen
Oxygen
Carbondioxide

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Chemistry
In addition to hydrogen, the other abundant element present on Sun’s surface is

Oxygen
Helium
Neon
Argon

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Chemistry
Which of the following is used for refrigeration?

Chlorine
Sulphur dioxide
Phosphine
Freon

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Chemistry
Threshold limit value of copper in the atmospheric air is

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

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MORE MCQ ON Chemistry

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