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Answer the following. (Class 12 Chemistry 2024, Q24)

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ChemistryCBSE Class 12 · Board exam 2024, set 56/1/1 · 3 marks · Short answer

CBSE Class 12 Chemistry 2024: question 24

Set in the CBSE Class 12 board exam of 2024, paper 56/1/1, section C, question 24, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q24 · 3 marks · Short answerCoordination Compounds

Answer the following.

  1. (a)

    Write the formula for the following coordination compound : Potassium tetrahydroxidozincate (II)

    1 mark
  2. (b)

    Arrange the following complexes in the increasing order of conductivity of their solution : , ,

    1 mark
  3. (c)

    Identify the type of isomerism exhibited by the following complexes : (i) (ii)

    1 mark

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 56/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Only the ions outside the square bracket are released in solution.

Hint 2

NO₂⁻ can bind through two different atoms; en is a bidentate chelating ligand.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (a) — four OH⁻ ligands on Zn²⁺ give a −2 complex ion, balanced by two K⁺.

    1 mark

  2. (b) Conductivity depends on the number of ions produced: (0 ions) < (3 ions) < (4 ions).

    1 mark

  3. (c)(i) : linkage isomerism (ambidentate NO₂⁻ binds through N or O as –ONO). (ii) : optical isomerism (non-superimposable mirror images, d and l forms).

    1 mark

Answer: (a) K₂[Zn(OH)₄]; (b) [Cr(NH₃)₃Cl₃] < [Cr(NH₃)₅Cl]Cl₂ < [Cr(NH₃)₆]Cl₃; (c) (i) linkage, (ii) optical

Where the marks are

  • Correct formula K₂[Zn(OH)₄] (1 mark)
  • Correct increasing order of conductivity (1 mark)
  • Linkage isomerism (½ mark) and optical isomerism (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Coordination Compounds, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 56/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.