Chemistry
Acid rain is caused due to emission of which of the following in to the atmosphere ?

Oxides of nitrogen and sulphur
Carbon dioxide and carbon monoxide
Carbon monoxide and nitrogen
Ozone and carbon dioxide

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Accumulation of smoke and dust over the sigrees
Lack of oxygen in the surroundings of sigrees
Tendency of carbon dioxide to form a layer along with dust smoke
Interrupted release of moisture from the material

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