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Class 9 Chemistry · Chapter 6 · Test 6

Hydrated Compounds

25 MCQs covering hydrated copper sulfate and cobalt chloride and their reversible changes on heating and exposure to water.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

  1. Question 1

    What is the colour of hydrated copper sulfate CuSO4·5H2O?

    • ABlue
    • BWhite
    • CBlack
    • DGreen
    Show answer

    Answer: A

    Hydrated copper sulfate is blue.

  2. Question 2

    What happens when hydrated copper sulfate is heated?

    • AIt becomes blue
    • BIt becomes white
    • CIt becomes black
    • DIt becomes green
    Show answer

    Answer: B

    Heating removes water of crystallization and produces white anhydrous copper sulfate.

  3. Question 3

    What is the colour of anhydrous copper sulfate?

    • ABlue
    • BWhite
    • CPink
    • DYellow
    Show answer

    Answer: B

    Anhydrous copper sulfate is white.

  4. Question 4

    What happens when water is added to anhydrous copper sulfate?

    • AIt becomes blue
    • BIt becomes black
    • CIt becomes yellow
    • DIt remains white
    Show answer

    Answer: A

    Anhydrous copper sulfate becomes hydrated and regains its blue colour when water is added.

  5. Question 5

    Which formula represents hydrated copper sulfate?

    • ACuSO4
    • BCuSO4·5H2O
    • CCuSO4·H2O
    • DCu2SO4·5H2O
    Show answer

    Answer: B

    Hydrated copper sulfate contains five molecules of water of crystallization.

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