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Chemistry

Chemistry
Highly toxic gas which causes headache, visual difficulty, paralysis and even death is

CO2
All of these
O3
CO

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Chemistry
The process of removing calcium and magnesium from hard water is known as

Water softening
Sedimentation
Filtration
Flocculation

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Chemistry
The function of skimming tank in sewage treatment is to remove

Suspended solids
Gritty substances
Oil and fatty substances
Inorganic substances

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Chemistry
The main source of Naphthalene is

Diesel
Coal-tar
Charcoal
Camphor

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Chemistry
The sewage obtained from water closets and urinals is known as

Sullage
Garbage
Industrial waste
Sanitary waste

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Chemistry
Carbon footprint can be reduced by

Using energy efficient appliances
Commuting by public transport
All of these
Recycling waste materials

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