Chemistry
The BOD values of water indicate the

Amount of oxygen used for biochemical oxidation
Amount of ozone used for biochemical oxidation
Amount of oxygen used for biochemical reduction
Amount of organic debris

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Chemistry
Why is water not suitable for putting out a petrol fire ?

Petrol is too inflammable to be extinguished by water
Water, being heavy, slips below petrol which thus remains in contact with air and burns
The oxygen content of water is isolated by petrol and thus it helps in burning
The heat required for combustion of petrol is very low

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