Core Reactions: Redox
Slide 41 of 42
Practice Questions: Multiple Choice
1. N03/30. In which reaction does chromium undergo a change in oxidation number?
–A. Cr2O3 +3H2SO4 ® Cr2 (SO4)3 +3H2O
–B. Cr2(SO4)3 + 6NaOH ® 2Cr(OH)3 + 3Na2SO4
–C. K2Cr2O7 + 4H2SO4 + 6HCl ® Cr2(SO4)3 + K2SO4 + 7H2O +3Cl2
–D. 2K2CrO4 + H2SO4 ® K2Cr2O7 + K2SO4 + H2O
2. N02/31. In the reaction
3Br2 + 6CO + 3H2O ® 5Br- + BrO3- + 6HCO
–A. Br2 is only oxidised.
–B. Br2 is only reduced.
–C. Br2 is neither oxidised nor reduced.
–D. Br2 is both oxidised and reduced.