OCR A- Level Chemistry Paper 1 2022 Questions with 100% Correct Answers

Define Transition element Correct Answer A d-block element that can form at least one stable ion with an incomplete d sub-shell Why aren't scandium and Zinc transition elements? Correct Answer Cannot form stable ions with an incomplete d-sub shell. Sc 3+ has an empty d-sub shell and Zn 2+ has a full d sub shell. Name the oxidation states and coloured ions for Manganese Correct Answer MnO4 - (purple) MnO4 2- (green) Mn 2+ (pale pink) Name the oxidation state and coloured ions for Titanium Correct Answer Ti 3+ (purple) Ti 2+ (violet) Name the oxidation state and coloured ions for Vanadium Correct Answer VO2 + (yellow) VO 2+ (blue) V 3+ (green) V 2+ (violet) Name the oxidation state and coloured ions for Chromium Correct Answer Cr2O7 2- (orange) Cr 3+ (violet) Name the oxidation state and coloured ions for Iron Correct Answer Fe 3+ (yellow) Fe 2+ (pale green) Name the oxidation state and coloured ions for Cobalt Correct Answer Co 2+ (pink) Name the oxidation state and coloured ions for Nickel Correct Answer Ni 2+ (green) Name the oxidation state and coloured ions for Copper Correct Answer Cu 2+ (pale blue) Why are transition elements good catalysts? (+ one downside) Correct Answer Can easily change oxidation states by gaining or loosing electrons within the d-orbital. Transition metals are also good at adsorbing substances onto their surfaces lower than the activation energy of the reactions. Good for industry and environment as reactions can happen faster at lower temperatures and pressure. Poses health risks with exposure as many metals and their compounds are toxic.