Chemistry
Warming Ammonium chloride with sodium hydrochloride in a test tube is an example of

Isothermal system
Open system
Closed system
Isobaric system

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Chemistry
Which of the process is known as nitrification?

Conversion of ammonia to nitrites
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

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