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

Haemetite
None of these
Limnonite
Magnetite

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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
Conversion of ammonia to nitrites
Reaction of Nitrogen Monoxide with oxygen to form nitric acid

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