OCR CHEMISTRY A PAPER H432 01 MARK SCHEME SET 1 EXAMINATION TEST 2026 QUESTIONS WITH SOLUTIONS GRADED A+

OCR CHEMISTRY A PAPER H432 01 MARK
SCHEME SET 1 EXAMINATION TEST 2026
QUESTIONS WITH SOLUTIONS GRADED A+

⩥ Molecular formula. Answer: The number and type of atoms of each
element in a molecule


⩥ Anhydrous. Answer: Contains no water molecules


⩥ Hydrated. Answer: Crystalline compound containing water molecules


⩥ Celsius to Kelvin. Answer: K=C+273


⩥ % yield and atom economy. Answer: % yield = (actual/ theoretical) x
100


atom economy = (desired products/all reactants) x 100


⩥ Cu2+ in aq solution. Answer: [Cu(H2O)6]2+
Pale blue


⩥ Fe2+ in aq solution. Answer: [Fe(H2O)6]2+

,Pale green


⩥ Fe3+ in aq solution. Answer: [Fe(H2O)6]3+
Yellow


⩥ Mn2+ in aq solution. Answer: [Mn(H2O)6]2+
Pale pink


⩥ Cr3+ in aq solution. Answer: [Cr(H2O)6]3+
Green


⩥ Cu2+ and NaOH (aq). Answer: Initially:
[Cu(OH)2(H2O)4] (s)
Blue precipitate


Excess:
No change


⩥ Fe2+ and NaOH (aq). Answer: Initially:
[Fe(OH)2(H2O)4] (s)
Green precipitate

, Excess:
No change


⩥ Fe3+ and NaOH (aq). Answer: Initially:
[Fe(OH)3(H2O)3] (s)
Orange precipitate


Excess:
No change


⩥ Mn2+ and NaOH (aq). Answer: Initially:
[Mn(OH)2(H2O)4] (s)
Pink precipitate


Excess:
No change


⩥ Cr3+ and NaOH (aq). Answer: Initially:
[Cr(OH)3(H2O)3] (s)
Grey-green precipitate


Excess: