1) What is the reaction that happens when there is a gain of electrons? a) combustion b) reduction c) neutralization d) oxidation 2) The reducing agent is the substance being _______________________. a) reduced b) oxidized c) neutralized d) transferred 3) What is the oxidation number of a free or uncombined element?  a) zero b) one c) two d) three 4) The substance that is reduced is the ______________________. a) spectator ion b) limiting reagent c) oxidizing agent d) reducing agent 5) What happens when there is an increase in oxidation number? a) hydration b) oxidation c) reduction d) combustion 6) What is the oxidation number of Cl in KClO3? a) +3 b) +4 c) +5 d) -1 7) What are the two processes involved in redox reaction? a) hydration-oxygenation b) hydrolysis- electrolysis c) acid-base reaction d) reduction-oxidation

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