Chemistry
Which of the following is not a chemical reaction'?

Burning of paper
Digestion of food
Burning of coal
Conversion of water into steam

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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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