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Chemistry

Chemistry
Which of the following is a commercial source of energy?

Natural gas
Agricultural waste
Dried dung
Sun

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Chemistry
What is the chemical symbol of mercury

Hg
None of these
Mg
Mr

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Chemistry
The molecule which has the highest percentage of ionic character among the following is

HI
HF
HBr
HCI

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Chemistry
Ozone depletion in the atmosphere is mainly caused by

Sulphur dioxide
Hydrogen sulphide
Chlorofluorocarbon
Nitrogen dioxide

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Chemistry
Iron rusts quickly in

Sea water
River water
Distilled water
Rain water

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Chemistry
Alum stops bleeding in minor cuts because of

Solvation
Dialysis
Coagulation
Emulsion

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