Choose the incorrect sentence regarding $BOD$.
- AThe amount of dissolved oxygen in water increases, the $BOD$ increases.
- BIt is possible to estimate the amount of biodegradable organic matter in sewage water by measuring biochemical oxygen demand $(BOD)$.
- CMicro-organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge.
- DDecline in dissolved oxygen in water causes mortality of fish and other aquatic creatures.
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Electrostatic Precipitator $(ESP)$:
$I.$ Is an electrical device to remove particulate matter present in the exhaust of thermal power plant.
$II.$ More than $99\, \%$ particulate matter can be removed by this method.
$III.$ $ESP$ has electrode wires and a stage of collecting plates.
Which of the statements given above are correct?
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$II.$ More than $99\, \%$ particulate matter can be removed by this method.
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