Chemistry
Cloud is a colloidal dispersion of

Water drops in a dispersion medium of air
Fog in a dispersion medium of water
Mist in a dispersion medium of air
Air in a dispersion medium of water

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Chemistry
What are the components responsible for acid rain?

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

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