Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Neutralised by alkali treatment
Diluted with fresh water to reduce its acidity
Left as such without any treatment
None of these

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Environmental Engineering in CE
Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for

Oxidation of unburnt hydrocarbon fuel in the second compartment
All of these
Conversion of NOx into N₂ and NH₃ in the first compartment
Conversion of CO into CO₂ in the second compartment

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Environmental Engineering in CE
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes

Irritation in eyes
Poor visibility due to sky darkening
All of these
Respiratory trouble

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