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In the two tetrahedral… (Class 12 Chemistry 2023, Q6)

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ChemistryCBSE Class 12 · Board exam 2023, set 56/5/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2023: question 6

Set in the CBSE Class 12 board exam of 2023, paper 56/5/1, section A, question 6, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q6 · 1 mark · MCQThe d- and f-Block Elements

In the two tetrahedral structures of dichromate ion

  1. (A)4 Cr – O bonds are equivalent in length.
  2. (B)6 Cr – O bonds are equivalent in length.
  3. (C)All Cr – O bonds are equivalent in length.
  4. (D)All Cr – O bonds are non-equivalent.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 56/5/1.

Hints

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

Hint 1

Recall the structure of the dichromate ion.

Hint 2

Count the terminal oxygens; they are different from the bridging oxygen.

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. is made of two tetrahedra that share one bridging oxygen.

  2. The six terminal Cr–O bonds are equivalent in length. The two bridging Cr–O–Cr bonds are longer.

    1 mark

Answer: (B)

Where the marks are

  • States that the 6 terminal Cr–O bonds are equivalent (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from The d- and f-Block Elements, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 56/5/1: 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.