What is the [H+] when the pH is 4.2? Group of answer choices

A) 6.3x10^-5

B) 9.8

C) 1.6x10^-10

D) 1.6x10^4

pls give a little context, so I know how you got the answer :)

pie chart because it is in percents ( % )

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.