Which reaction represents the process of neutralization?

1) mg + 2hcl > mgcl2 + h2
2) hcl + koh > kcl + h2o
3) pb(no3)2 + cacl2 > ca(no3)2 + pbcl2
4) 2kclo3 > 2kcl + 3o2

2)

Explanation:  When an acid reacts with the base then it undergoes neutralization to form a salt and water.

1) : is an example of single replacement reaction as Mg replaces hydrogen from its salt solution.

2) : is an example of neutralization where acid and base reacts to give salt and water.

3) :  is an example of double displacement reaction in which exchange of ions take place.

4) : is an example of decomposition where a single reactant decomposes to give two or more products.

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explanation:

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2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.