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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasy
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White anhydrous copper sulphate turns blue when water drops are added. What does this prove?

Answer and explanation

Correct answer: Water restores the colour by forming hydrated copper sulphate

The governing concept is water of crystallisation. Anhydrous copper sulphate, CuSO4, is white because this water has been removed. When water is added, hydrated copper sulphate, CuSO4·5H2O, forms and the characteristic blue colour returns. Therefore option A correctly links the observed colour change with the presence of water; the other options do not describe this reversible hydration.

Related tags

Anhydrous Copper SulphateWater Of CrystallisationHydrationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
  4. 4What is the general nature of an aqueous soap solution?
  5. 5Which of the following substances turns red litmus paper blue?
  6. 6What is the nature of a solution whose pH is less than 7?
  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
  9. 9Which gas is generally produced when dilute acids react with active metals?
  10. 10A student dips red litmus paper into a soap solution. What will be the colour of the litmus paper?
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