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Silver chloride kept in a… (Class 10 Science 2023, Q27)

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ScienceCBSE Class 10 · Board exam 2023, set 31/2/1 · 3 marks · Short answer

CBSE Class 10 Science 2023: question 27

Set in the CBSE Class 10 board exam of 2023, paper 31/2/1, section C, question 27, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q27 · 3 marks · Short answerChemical Reactions and Equations

Silver chloride kept in a china dish turns grey in sunlight.

  1. (a)

    Write the colour of silver chloride when it was kept in the china dish.

    1 mark
  2. (b)

    Name the type of chemical reaction taking place and write the chemical equation for the reaction.

    1 mark
  3. (c)

    State one use of the reaction. Name one more chemical which can be used for the same purpose.

    1 mark

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/2/1.

Hints

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

Hint 1

The colour changes to grey because a metal forms. What was it before?

Hint 2

One reactant breaks into two simpler substances. Name that reaction type.

Hint 3

Which other silver halide behaves the same way in light?

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) Silver chloride is white in colour.

    ½ mark

  2. (b) This is a decomposition reaction brought about by light, called photolytic decomposition.

    ½ mark

  3. (b) . The grey colour is due to silver metal.

    1 mark

  4. (c) Use: This reaction is used in black-and-white photography.

    ½ mark

  5. (c) Another chemical: Silver bromide, , can also be used for the same purpose.

    ½ mark

Answer: (a) White; (b) photolytic decomposition, 2AgCl → 2Ag + Cl₂; (c) black-and-white photography; silver bromide (AgBr)

Where the marks are

  • Colour white (½ mark)
  • Decomposition (photolytic) reaction (½ mark)
  • Balanced equation 2AgCl → 2Ag + Cl₂ (1 mark)
  • Use in black-and-white photography (½ mark)
  • Names silver bromide (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Chemical Reactions and Equations, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 31/2/1: 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.