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AP Intermediate 2nd Year Coordination Compounds — practice questions

Explore 19 free 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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Coordination Compounds questions and exercises with answers

Showing questions 1–19 of 19.

**EDTA** (ethylenediaminetetraacetate) is a:Read the answer and worked solution →Ethylenediamine (en, H₂N-CH₂-CH₂-NH₂) is a:Read the answer and worked solution →The **oxidation state of Fe** in $K_4[Fe(CN)_6]$ is:Read the answer and worked solution →The **coordination number** of the central metal in $[Co(NH_3)_4Cl_2]^+$ is:Read the answer and worked solution →An **octahedral** geometry corresponds to a coordination number of:Read the answer and worked solution →**Werner's primary valency** of a metal in a coordination compound is satisfied by:Read the answer and worked solution →Which of the following is a **homoleptic** complex?Read the answer and worked solution →Which is an example of an **ambidentate** ligand?Read the answer and worked solution →The IUPAC name of $K_4[Fe(CN)_6]$ is:Read the answer and worked solution →Which is **not** a feature of a **double salt**?Read the answer and worked solution →The IUPAC name of $[Co(NH_3)_5Cl]Cl_2$ is:Read the answer and worked solution →The IUPAC name for the ligand **H₂O** in a coordination compound is:Read the answer and worked solution →Cisplatin, $[Pt(NH_3)_2Cl_2]$, is a **square planar** complex used as an anticancer drug. The trans-isomer:Read the answer and worked solution →The **Effective Atomic Number (EAN)** of Co in $[Co(NH_3)_6]^{3+}$ (Z(Co) = 27) is:Read the answer and worked solution →In the complex $K_3[Cr(C_2O_4)_3]$, the coordination number and oxidation state of Cr respectively are:Read the answer and worked solution →How many ions are produced per formula unit when $[Cr(NH_3)_6]Cl_3$ is dissolved in water?Read the answer and worked solution →The oxidation state of Cr in $[Cr(CO)_6]$ is (Z(Cr) = 24):Read the answer and worked solution →How many geometric isomers does the octahedral complex $[Co(en)_2Cl_2]^+$ exhibit?Read the answer and worked solution →Which complex would exhibit **optical isomerism**?Read the answer and worked solution →

Worked practice questions

**EDTA** (ethylenediaminetetraacetate) is a:

  1. Monodentate ligand
  2. Bidentate ligand
  3. Tetradentate ligand
  4. Hexadentate ligand
Show answer and solution

Correct answer: D. Hexadentate ligand

EDTA binds via 4 oxygen donors (from 4 carboxylate groups) + 2 nitrogen donors = **6** donor atoms — hence hexadentate. It chelates metal ions in an octahedral cage used in water-softening and titrations.

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Ethylenediamine (en, H₂N-CH₂-CH₂-NH₂) is a:

  1. Monodentate
  2. Bidentate
  3. Tridentate
  4. Hexadentate
Show answer and solution

Correct answer: B. Bidentate

Two nitrogen donors per molecule — each lone pair on N coordinates with the metal. Forms a 5-membered chelate ring; commonly used in [Co(en)₃]³⁺ etc.

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The **oxidation state of Fe** in $K_4[Fe(CN)_6]$ is:

  1. +1
  2. +2
  3. +3
  4. +4
Show answer and solution

Correct answer: B. +2

**Charge balance:** 4(+1) + [Fe + 6(-1)] = 0 We have ⇒ Fe + (-6) = -4 ⇒ Fe. So ⇒ Fe + (-6) = **+2**. K₄[Fe(CN)₆] is potassium ferrocyanide.

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More Chemistry topics

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