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Subjects
Science CBSE
Class 7
Acids, bases and salts
Properties and pH scale
9.
Choose the correct answers
Exercise condition:
4
m.
I)
Rose observed some neutralization processes in acid industries before mixing the wastes into water bodies. What kind of solution is added to the wastes?
Acid
Base
Salt
Water
II)
Acids react with active metals and release a gas. What is that gas?
Hydrogen
Oxygen
Nitrogen
Carbon dioxide
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