What is the PH of - [H+] = 1.2 x 10-2 M
- [H+] = 5.8 x 10-9 M
- [H+] = 3.92 x 10-12 M
- [H+] = 4.52 x 10-5 M

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answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.