The newest 20 of 53 written questions. Open one to see it on the real paper.
This complex shows stereoisomerism. Draw three-dimensional diagrams to show all the stereoisomers of this complex. The C 2 O 42– ion can be represented using O O .
See it on the paper →State the type or types of stereoisomerism shown by this complex.
See it on the paper →[Cr(H,0),(OH),] shows stereoisomerism. Draw three-dimensional diagrams in Figure 1.2 to suggest the two stereoisomers of [Cr(H,O)3(OH)s]. isomer 1 isomer 2 Cr Cr Figure 1.2 (i) An aqueous solution of iron(II) ions, Fe**, contains the [Fe(H,0), }°* complex ion. This solution is acidic in a similar way to an aqueous solu...
See it on the paper →Identify which complex, E or F, exists as a mixture of two stereoisomers and the type of stereoisomerism involved. The complex which exists as a mixture of two stereoisomers is .
See it on the paper →The complex ion [Au(CN) 2 Br 2 ] – displays geometrical (cis / trans) isomerism. Draw the structure of trans-[Au(CN) 2 Br 2 ] – . State its shape and the Br-Au-Br bond angle.
See it on the paper →Complete the three-dimensional diagrams in Fig. 6.3 to show both stereoisomers of [Cu(U) 3 ] 4– . Use O O O O to represent ligand U. Cu Cu Cu Cu
See it on the paper →Complete Fig. 5.1 to show the three-dimensional structures of the two isomers of [Ni(en) 3 ] 2+ . Use N N to represent the en ligand. Name the type of isomerism shown. Ni Ni Fig. 5.1
See it on the paper →Name the shape of the complex ion [Ag(NH 3 ) 2 ] + . State the bond angle for H-N-Ag and for N-Ag-N. shape bond angle for H-N-Ag = ° bond angle for N-Ag-N = °
See it on the paper →Potassium iron( III ) ethanedioate, K 3 [Fe(C 2 O 4 ) 3 ], dissolves in water to form a green solution. Explain why transition elements can form coloured complexes.
See it on the paper →One of the complexes, [Rh(en) 2 Cl 2 ] + or [Rh(CO) 2 Cl 2 ] + , can exist in three isomeric forms. Identify this complex and the types of isomerism shown.
See it on the paper →Draw the three-dimensional structures of the two isomers of [Ni(H 2 O) 2 (NH 3 ) 4 ] 2+ in the boxes and identify the type of isomerism shown. Ni Ni type of isomerism shown
See it on the paper →Some transition element complexes can show stereoisomerism. State two types of stereoisomerism shown by transition element complexes.
See it on the paper →The complex [Cr(en) 3 ] 2+ exists as two stereoisomers [Cr(OCH 2 CH 2 NH 2 ) 3 ] − exists as four stereoisomers. whereas the complex Complete the three‑dimensional diagrams in Fig. 2.1 to show the four stereoisomers of [Cr(OCH 2 CH 2 NH 2 ) 3 ] − . Represent the ligand – OCH 2 CH 2 NH 2 by using . O N Cr Cr Cr Cr Fig....
See it on the paper →The complex [Co(H 2 O) 2 (C 2 O 4 )BrCl ] − exists as stereoisomers. Complete the three-dimensional diagrams in Fig. 2.2 to show four stereoisomers of [Co(H 2 O) 2 (C 2 O 4 )BrCl ] − . The C 2 O 42– ligand is represented using O O . O O Co Co O O O O Co Co O O
See it on the paper →State the oxidation state of cobalt in this complex and a type of stereoisomerism shown. oxidation state of cobalt
See it on the paper →Some transition element complexes can show stereoisomerism. State two types of stereoisomerism shown by transition element complexes.
See it on the paper →The complex [Cr(en) 3 ] 2+ exists as two stereoisomers [Cr(OCH 2 CH 2 NH 2 ) 3 ] − exists as four stereoisomers. whereas the complex Complete the three‑dimensional diagrams in Fig. 2.1 to show the four stereoisomers of [Cr(OCH 2 CH 2 NH 2 ) 3 ] − . Represent the ligand – OCH 2 CH 2 NH 2 by using . O N Cr Cr Cr Cr Fig....
See it on the paper →An excess of C 2 O 42– reacts with VO 2+ to form a mixture of two octahedral complex ions. The complex ions are stereoisomers of each other. Each complex ion contains a V 2+ cation and three C 2 O 42– ions. Complete the diagram to show the three-dimensional structure of one of the complex ions. Include the charge of th...
See it on the paper →Cu 2+ (aq) reacts with CH 3 NH 2 to form [Cu(CH 3 NH 2 ) 2 (H 2 O) 4 ] 2+ . Draw three-dimensional diagrams to show the two geometrical isomers of [Cu(CH 3 NH 2 ) 2 (H 2 O) 4 ] 2+ . Cu Cu
See it on the paper →Complete Table 5.1 to state the geometry, the coordination number of copper, and one bond angle in each of the two complex ions. Table 5.1 complex ion geometry coordination number bond angle [Cu(H 2 O) 6 ] 2+ [CuCl 4 ] 2–
See it on the paper →Many accurately-drawn correct answers were seen, using correct conventions for the three-dimensional bonds (wedged and dashed bonds). The most common errors were: • diagrams without any 3-D bonds • diagrams in which 3-D bonds were drawn but where the complex could not be octahedral as shown.
— Examiner report, February/March 2025, 9701/42 Q6(b)(iii) (Cambridge)
This discriminated well. Candidates who realised that the complex described is [Rh(en)2Cl2]+ usually want on to complete a good answer.
— Examiner report, October/November 2023, 9701/42 Q6(b)(v) (Cambridge)
Two marks were often scored. However some candidates decided that the two structures were optical isomers and drew two renditions of the cis isomer that were actually identical.
— Examiner report, October/November 2023, 9701/42 Q6(b)(vi) (Cambridge)
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