Explain4 marksStandard
A complex is formed when nickel(II) chloride reacts with an excess of ethane-1,2-diamine, , a bidentate ligand. The complex ion has the formula .
Explain why this complex ion can exist as a pair of optical isomers.
CAIE A Level Chemistry 9701 · Chemistry of transition elements
Chemistry of transition elements: explain question
How this question is marked
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
More Chemistry of transition elements questions
- 5 marks · Two copper(II) complexes are formed from the hexaaquacopper(II) ion in aqueous solution. Complex A: ce[Cu(H2O)6]^2+ + 4NH3 -…
- 5 marks · An octahedral cobalt(III) complex has the formula [Co(NH3)4Cl2]+. The two chloride ligands can be arranged either on adjacent positions or…
- 4 marks · A cobalt(III) complex has the formula ce[Co(en)2(H2O)2]^3+, where en is ethylenediamine (H2NCH2CH2NH2), a bidentate ligand. Explain the…
- 4 marks · An aqueous solution of copper(II) sulfate is pale blue. When concentrated hydrochloric acid is added, the solution turns yellow-green…
- 5 marks · Two nickel(II) complexes are studied. Complex A is [Ni(H2NCH2CH2NH2)2(H2O)2]^2+ and complex B is [Ni(H2NCH2CH2NH2)3]^2+. Compare the types…
- 4 marks · A student adds aqueous ammonia, in small portions, to an aqueous solution of copper(II) sulfate. Explain, in terms of ligand exchange…
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.