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For the Regents exam, they only ask you to find a reaction that an element changes oxidation number.

Regents redox reactions have a Free element on one side of a reaction and the same element bonded to something on the other side.

Example-          2H₂ + O₂ --> 2H₂O             Free element ---> Bonded element

example 2         2KClO₃ --> 2KCl +3O₂       Bonded oxygen ----> Free oxygen

Not redox (ions)     K⁺ + Cl^- --> KCl      watch out for the IONS

That is all you need to know for this question

Past Regents Redox Reactions Questions

Aug 2008-42 Which equation represents an oxidation reduction reaction?
(1) CH₄ + 2O₂ ==> CO₂ + 2H₂O
(2) H₂SO₄ + Ca(OH)₂  ==> CaSO₄ + 2H₂O
(3) MgCrO₄ + BaCl₂  ==> MgCl₂ + BaCrO₄
(4) Zn(NO₃)₂ + Na₂CO₃ � ==> 2NaNO₃ + ZnCO₃

June 2006-23 Which balanced equation represents a redox reaction?
(1) AgNO₃ + NaCl ==>AgCl + NaNO₃
(2) BaCl₂ + K₂CO₃ �==> BaCO₃ + 2KCl
(3) CuO + CO==> Cu + CO₂
(4) HCl + KOH �==> KCl + H₂O

Aug 2004-26 Which reaction is an example of an oxidation reduction reaction?

(1) AgNO3 + KI -->AgI + KNO3

(2) Cu + 2 AgNO3 -->Cu(NO3)2 + 2 Ag

(3) 2 KOH + H2SO4 -->K2SO4 + 2 H2O

(4) Ba(OH)2 + 2 HCl -->BaCl2 + 2 H2O

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