Chemistry
Chemical composition of cement is

Clay and Gypsum
Limestone and Clay
Limestone and Gypsum
Limestone, Clay and Gypsum

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Chemistry
Which of the process is known as nitrification?

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

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