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Indian Navy 10+2 B.Tech Cadet d- and f-Block Elements — practice questions

Explore 29 free d- and f-Block Elements questions in Indian Navy 10+2 B.Tech Cadet Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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d- and f-Block Elements questions and exercises with answers

Showing questions 1–29 of 29.

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 →d-block elements have differentiating electrons in:Read the answer and worked solution →K₂Cr₂O₇ (potassium dichromate) is a strong:Read the answer and worked solution →Oxidation state of Cu in [Cu(NH₃)₄]²⁺:Read the answer and worked solution →The unusual stability of EDTA-metal complexes is mainly due to the:Read the answer and worked solution →Match each scientist to their contributionRead the answer and worked solution →Ionic or covalent?Read the answer and worked solution →Complete the driver of bond formationRead the answer and worked solution →Single, double and triple bondsRead the answer and worked solution →True or false: Lewis structuresRead the answer and worked solution →Complete the definition of resonanceRead the answer and worked solution →Tap every bond parameter the chapter namesRead the answer and worked solution →True or false: ionic solidsRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Bonded pair or lone pair?Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the reasoning: why resonance is neededRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →True or false: what bond parameters affectRead the answer and worked solution →Bond parameters in useRead the answer and worked solution →Which parameter answers this?Read the answer and worked solution →True or false: resonanceRead the answer and worked solution →Order the steps: draw a Lewis structureRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: structureRead the answer and worked solution →Flip and pair: parameter with what it measuresRead the answer and worked solution →

Worked practice questions

Among $\mathrm{Sc^{3+}}$, $\mathrm{Ti^{4+}}$, $\mathrm{V^{2+}}$ and $\mathrm{Zn^{2+}}$, which is **coloured** in aqueous solution?

  1. $\mathrm{Sc^{3+}}$
  2. $\mathrm{Ti^{4+}}$
  3. $\mathrm{V^{2+}}$
  4. $\mathrm{Zn^{2+}}$
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Correct answer: C. $\mathrm{V^{2+}}$

Colour in transition-metal aquo ions comes from $d$-$d$ transitions, which require partially-filled $d$-orbitals. $\mathrm{Sc^{3+}}$ ($d^0$), $\mathrm{Ti^{4+}}$ ($d^0$) and $\mathrm{Zn^{2+}}$ ($d^{10}$) all have either empty or completely filled d-shells, so they are colourless. $\mathrm{V^{2+}}$ is $d^3$, giving a violet colour in solution.

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d-block elements have differentiating electrons in:

  1. p-orbital
  2. d-orbital (groups 3-12)
  3. s-orbital
  4. f-orbital
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Correct answer: B. d-orbital (groups 3-12)

d-block: groups 3-12. d-electron is the differentiating one. Includes Sc, Ti, V, Cr, Mn, Fe, ..., Cu, Zn, etc. Transition metals (technically d¹-d⁹, so Sc-Cu).

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K₂Cr₂O₇ (potassium dichromate) is a strong:

  1. Reductant
  2. Reducing agent
  3. Catalyst
  4. Oxidizing agent (Cr goes from +6 to +3)
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Correct answer: D. Oxidizing agent (Cr goes from +6 to +3)

**In acidic medium:** Cr₂O₇²⁻ + 14 H⁺ + 6 e⁻ → 2 Cr³⁺ + 7 H₂O (E° = +1.33 V). Strong oxidizer. Orange-red color. Used in volumetric analysis and tanning. KMnO₄ even stronger oxidizer.

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