Environmental Engineering in CE
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes

Corrosion, tarnishing & soiling of metals
All of these
Fading of dyes on textiles
Reduced strength of textiles

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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

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

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