Chemistry
Neoprene is prepared by polymerisation of which of the following

1,3-butadiene
Acrylonitrile
2-methyl 1, 3-butadiene
2-chloro-1, 3-butadiene

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

Interrupted release of moisture from the material
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

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Chemistry
What are the components responsible for acid rain?

Oxides of carbon (COx) and Oxides of nitrogen (NOx)
Nitrogen monoxide (NO) and Carbon monoxide (CO)
Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
Carbon dioxide (CO2) and Carbon monoxide (CO)

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