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1..Calcination is the pyrochemical process in which metals are heated in the absence of oxygen
Roasting is the pyrochemical process in which metals are heated in the presence of oxygen
2..yes I agree with this statement
28..In our digestive system :Hydrochloric acid produced in our stomach helps the digestion of food without causing any harm to the stomach. ...
Acids cause tooth decay : When we eat sugary food, it gets degraded by bacteria present in the mouth and an acid is formed.
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