Chemistry
Which of the following vitamins is generally excreted by human in urine?

Vitamin C
Vitamin B
None of these
Vitamin D

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Chemistry
An oxidising agent is a

An electron donor
It releases H2 in a chemical reaction
An electron acceptor
In a chemical reaction its oxidation number increases

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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
Metal are good conductors, because

They contain reflecting surface
The molecules in them collide very freely
They contain free electrons
The molecules in them are very close to each other

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