Chemistry
Which one of the following elements is least likely to be found in commercial fertilisers?

Silicon
Phosphorous
Nitrogen
Potassium

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Chemistry
Which of the process is known as nitrification?

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

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