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Chemistry

Chemistry
Concentration of a material which is lethal to 50% animal is called

LC50
ADI
NOAEL
LD50

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Chemistry
Sea water can be purified by the process of

Evaporation
Distillation
Filtration
Fractional distillation

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Chemistry
The depletion in Ozone layer is caused by ________ .

Methane
Nitrous oxide
Carbon dioxide
Chlorofluorocarbons

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Chemistry
Bee sting contains

A salt solution
An acidic liquid
An alkaline liquid
A corrosive liquid

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Chemistry
A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be

Zinc
Silver
Copper
Aluminium

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Chemistry
The new strain of bacteria produced by biotechnology in alcohol industry is

Pseudomonas putida
Saccharomyces cerevisiae
Escherichia coli
Bacillus subtilis

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