Chemistry
The property of hydrogen which distinguishes it from alkali metals is

Its affinity for non-metal
Its non-metallic character
Its reducing character
Its electropositive character

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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 Monoxide with oxygen to form nitric acid
Reaction of nitrogen dioxide with water to form nitric acid

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