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

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

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Chemistry
Antacid tablets consist of

Hydroxides of sodium, magnesium and aluminium
Hydroxides of magnesium and aluminium
Hydroxides of sodium and aluminium
Hydroxides of magnesium and sodium

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