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Chemistry

Chemistry
Which of the following is ozone depleting pesticide ?

D.T.
Methyl bromide
Benzene
Ethylene ozonide

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Chemistry
Main pollutants released from iron and steel industry are

CO2, H2S and NO2
CO, CO2 and SO2
NO, SO3 and H2S
CO2, NO2 and SO3

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Chemistry
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

3 billion years
0.01 minute
13 days
100 years

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Chemistry
One property of ammonia is

Its aqueous solution turns red litmus blue
It is a yellowish gas
It is a odourless gas
It is insoluble in water

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Chemistry
Which one of the following nonmetals shows allotropy in the liquid state?

Bromine
Phosphorous
Sulphur
Carbon

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Chemistry
Among the following iron ores, the highest percentage of iron content is found in–

Limnonite
Haemetite
None of these
Magnetite

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