Redox Reaction Challenge: Transition Elements EditionOnline version Test your knowledge on redox reactions involving transition elements! by Candrawulan Primadianningsih 1 What is a redox reaction? a A reaction involving the transfer of electrons. b A reaction that only occurs in gases. c A reaction that produces light. d A reaction that involves only acids. 2 Which transition element commonly acts as a catalyst in redox reactions? a Iron (Fe) b Lead (Pb) c Sodium (Na) d Calcium (Ca) 3 What is the oxidation state of manganese in MnO4-? a +4 b +7 c +2 d 0 4 Which of the following is a common oxidizing agent in redox reactions? a Magnesium sulfate (MgSO4) b Calcium carbonate (CaCO3) c Sodium chloride (NaCl) d Potassium permanganate (KMnO4) 5 In redox reactions, what does reduction refer to? a Loss of electrons. b Increase in temperature. c Gain of electrons. d Formation of gas. 6 Which transition metal is known for its variable oxidation states? a Aluminum (Al) b Zinc (Zn) c Barium (Ba) d Copper (Cu) 7 What is the role of transition metals in biological systems? a They store energy. b They are only waste products. c They act as essential cofactors for enzymes. d They provide structural support. 8 What is the reduction half-reaction for Fe3+ to Fe2+? a Fe + e- → Fe2+ b Fe3+ + e- → Fe2+ c Fe2+ + e- → Fe3+ d Fe3+ + 2e- → Fe 9 Which of the following is a characteristic of transition metals? a They can form complex ions. b They are all gases at room temperature. c They have a single oxidation state. d They do not conduct electricity. 10 What happens to the oxidation state of a metal when it is oxidized? a It decreases. b It increases. c It becomes negative. d It remains the same.
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