For the carbonate anion test a "positive" test result will be indicated by which of the following observations?

A. a white solid will form
B. the mixture will get very cold
C. the mixture will get very hot
D. bubbles will form

lithosphere and asthenosphere

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.

the answer is d. 74.02