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AP Intermediate 2nd Year The d- and f-Block Elements & Coordination Compounds — practice questions — page 3

Explore 99 free The d- and f-Block Elements & Coordination Compounds questions in AP Intermediate 2nd Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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The d- and f-Block Elements & Coordination Compounds questions and exercises with answers

Showing questions 61–90 of 99.

The HEXACYANIDOFERRATE(II) ion $[\mathrm{Fe(CN)_6}]^{4-}$ contains iron in oxidation stateRead the answer and worked solution →In Crystal Field Theory, the 5 d-orbitals in an OCTAHEDRAL field split into:Read the answer and worked solution →In the spectrochemical series, which ligand is the STRONGEST field?Read the answer and worked solution →The drug CISPLATIN has the formula [Pt(NH3)2Cl2]. Its anti-cancer activity comes from the:Read the answer and worked solution →In Valence Bond Theory, an octahedral LOW-SPIN complex like [Co(NH3)6]³⁺ uses which hybridisation?Read the answer and worked solution →The unusual stability of EDTA-metal complexes is mainly due to the:Read the answer and worked solution →The COORDINATION NUMBER of the central metal in a complex isRead the answer and worked solution →A ligand that has ONLY ONE donor atom (which forms a single bond to the central metal) is calledRead the answer and worked solution →Coordination compounds of transition metals are often COLOURED. CFT explains this colour as arising fromRead the answer and worked solution →$[\mathrm{Ni(CO)_4}]$ is tetrahedral and diamagnetic. The oxidation state of nickel in this complex isRead the answer and worked solution →Which of the following coordination compounds shows OPTICAL ISOMERISM?Read the answer and worked solution →ETHYLENEDIAMINETETRAACETATE (EDTA) is a famous polydentate ligand. It isRead the answer and worked solution →The coordination number 6 most commonly gives which geometry?Read the answer and worked solution →The IUPAC name of $[\mathrm{Co(NH_3)_6}]^{3+}$ isRead the answer and worked solution →Among $\mathrm{Sc^{3+}}$, $\mathrm{Ti^{4+}}$, $\mathrm{V^{2+}}$ and $\mathrm{Zn^{2+}}$, which is **coloured** in aqueous solution?Read the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Complete the coordination sphere ruleRead the answer and worked solution →Tap every statement true of a chelate complexRead the answer and worked solution →Match each complex to its shapeRead the answer and worked solution →True or false: ambidentate ligandsRead the answer and worked solution →Synergic bonding in metal carbonylsRead the answer and worked solution →Order the steps: read a formula like K₄[Fe(CN)₆]Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →True or false: where coordination chemistry mattersRead the answer and worked solution →Inside the brackets or outside?Read the answer and worked solution →Complete Werner's postulateRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Match each theory to what it explainsRead the answer and worked solution →

Worked practice questions

The HEXACYANIDOFERRATE(II) ion $[\mathrm{Fe(CN)_6}]^{4-}$ contains iron in oxidation state

  1. $+1$
  2. $+2$
  3. $+3$
  4. $+4$
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Correct answer: B. $+2$

1. The hexacyanidoferrate(II) IUPAC suffix '-(II)' explicitly tells us the iron oxidation state — but let's compute it as a check. 2. Total charge on the complex ion: $-4$. 3. Six $\mathrm{CN^-}$ ligands contribute $-6$ total charge. 4. Let Fe oxidation state be $x$: $x + 6(-1) = -4 \Rightarrow x = +2$. 5. So iron is in the $+2$ state, consistent with the (II) in the name. 6. This ion forms the famous ferrocyanide salts — yellow prussiate of potash, $K_4[\mathrm{Fe(CN)_6}]$. 7. Options A, C, D would all require a different complex charge. _Source: syllabus Chemistry Part 1, Ch 5, §5.3 (Oxidation state calculation + nomenclature consistency), p. 4–5._

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In Crystal Field Theory, the 5 d-orbitals in an OCTAHEDRAL field split into:

  1. Three lower eg + two higher t2g levels
  2. Three lower t2g + two higher eg levels
  3. All five d-orbitals at the same energy
  4. Two lower t2g + three higher eg levels
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Correct answer: B. Three lower t2g + two higher eg levels

**Octahedral CFT splitting:** t2g (3 orbitals: dxy, dyz, dxz) at LOWER energy + eg (2 orbitals: dx²-y², dz²) at HIGHER energy. Energy gap = Δ₀ (crystal field splitting). In tetrahedral, splitting is reversed.

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In the spectrochemical series, which ligand is the STRONGEST field?

  1. Iodide (I⁻), weakest
  2. Water (H2O), moderate
  3. Fluoride (F⁻), weak
  4. Carbon monoxide (CO)
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Correct answer: D. Carbon monoxide (CO)

**Spectrochemical series (weak to strong):** I⁻ < Br⁻ < Cl⁻ < F⁻ < H2O < NH3 < en < NO2⁻ < CN⁻ < CO. CO and CN⁻ are the strongest field ligands (cause low spin).

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