Chemistry
Brass gets discoloured in air due to constant exposure in presence of:

Aluminium sulphide
Aluminium phosphide
Hydrogen sulphide
Hydrogenated wafers

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Chemistry
Which of the process is known as nitrification?

Reaction of nitrogen dioxide with water to form nitric acid
Conversion of nitrite to nitric oxide
Reaction of Nitrogen Monoxide with oxygen to form nitric acid
Conversion of ammonia to nitrites

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