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Chemistry

Chemistry
Among the following, carbonate ore of Zinc is

Calamine
Zincblende
Sphalerite
Zincite

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Chemistry
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

5x/36
5x
x/6
7.2 x

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Chemistry
Physico-chemical characteristics of water in water sources undergo changes due to

Evapotranspiration
Auatic fungi
Aquatic macrophytes
Effluents

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Chemistry
An important green-house gas other than methane being produced from the agricultural fields is

Ammonia
Sulphur dioxide
Nitrous oxide
Arsine

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Chemistry
Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?

Nitrous oxide
Chlorofluorocarbons
Carbon dioxide
Sulphur dioxide

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Chemistry
Which of the following is not a donor atom?

Arsenic
Antimony
Phosphorus
Aluminium

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