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Explanation:

In a chemical reaction, new substances with entirely different properties are formed.

types of chemical reactions:

1. Combination reactions

Two reactants combine to form a single product

eg: C + O2 = CO2

2. Decomposition reactions

A single reactant decomposes to form 2 or more products.

eg 2H2O = 2H2 + O2

3. Displacement reactions

More reactive element displaces less reactive element from its compound

eg Zn + H2SO4 = ZnSO4 + H2

4. Double displacement reactions

There is a mutual displacement of ions

eg. BaSO4 + 2NaCl = BaCl2 + Na2SO4

5. Redox Reactions

Where both reduction and oxidation take place simultaneously

eg 2Cu + O2 = 2CuO

Here Cu is oxidized and O2 is reduced

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