Skip to content

The electron dot structure of… (Class 10 Science 2023, Q7)

questionbuddy.in/q/cbse-10-science-2023-31-4-1-q7-electron-dot-structure-chlorine-molecule

ScienceCBSE Class 10 · Board exam 2023, set 31/4/1 · 1 mark · MCQ

CBSE Class 10 Science 2023: question 7

Set in the CBSE Class 10 board exam of 2023, paper 31/4/1, section A, question 7, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q7 · 1 mark · MCQCarbon and its Compounds

The electron dot structure of chlorine molecule is :

  1. (A)Electron dot structure (a) shown in figure
  2. (B)Electron dot structure (b) shown in figure
  3. (C)Electron dot structure (c) shown in figure
  4. (D)Electron dot structure (d) shown in figure

Figure in the paper: Four Lewis electron-dot diagrams of Cl atoms/Cl2 molecule, labelled (a) to (d) in the options. (a): two Cl atoms with overlapping circles, each with x-marked and dot-marked electrons, shared pair between them, remaining electrons shown as crosses/dots. (b): one Cl with a shared pair and one Cl shown with only dots (lone pairs) and an unshared single dot arrangement. (c): one Cl with overlapping circles sharing a pair and the other Cl with only lone pair dots. (d): two Cl atoms with overlapping circles sharing a pair of electrons, each with 3 lone pairs shown. See it in the official paper.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/4/1.

Hints

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

Hint 1

Chlorine has 7 valence electrons.

Hint 2

Look for one shared pair and three lone pairs on each atom.

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. Each Cl atom (2,8,7) shares one electron, giving a single shared pair between the atoms. Each Cl is then left with 3 lone pairs, so both have 8 electrons.

  2. According to the marking scheme, structure (c) shows this correctly, so the answer is option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • Selects the structure with one shared pair and complete octets, option (C) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Carbon and its Compounds, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 31/4/1: 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.