Which of the following would not be a redox reaction? A. the combustion of a hyd

Question

Which of the following would not be a redox reaction?

A. the combustion of a hydrocarbon in oxygen gas
B. the reaction that occurs when aqueous calcium chloride is mixed with aqueous sodium carbonate
C. the reaction between iron metal and sulfur to form iron(II) sulfide
D. the reaction between zinc metal and aqueous hydrochloric acid
E. the reaction that occurs when gaseous chlorine is bubbled through an aqueous potassium iodide solution

Explanation / Answer

The answer is: D. the reaction that occurs when aqueous calcium chloride is mixed with aqueous sodium carbonate. CaCl2(aq) + Na2CO3(aq) => CaCO3(s) + 2 NaCl(aq), This is a precipitation reaction. No elements are oxidized or reduced since their oxidation states do not change.

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