Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Tendency of carbon dioxide to form a layer along with dust smoke
Lack of oxygen in the surroundings of sigrees
Accumulation of smoke and dust over the sigrees
Interrupted release of moisture from the material

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

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Chemistry
All isotopes of the same element have ________

The same atomic number but different atomic masses
Different atomic numbers and the same atomic mass
The same atomic number and the atomic mass
Different atomic numbers and different atomic mass

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