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Chemistry Class Confirmatory Tests

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Questions and Answers

What is the result of heating the copper sulphide test mixture?

Production of sulphur and copper nitrate

Formation of deep blue tetraamminecopper(II) sulphate

Oxidation of sulphur to sulphate (correct)

Formation of copper ferrocyanide

What color precipitate is formed when potassium hexacyanoferrate(II) is added to the blue copper solution?

Yellow precipitate

White precipitate

Chocolate coloration (correct)

Green coloration

What indicates the presence of Group III metal cations after adding ammonium hydroxide?

No visible change

Dissolution of the original solution

Formation of a yellow precipitate

Formation of a brown or white precipitate (correct)

What is produced when ferric hydroxide dissolves in hydrochloric acid?

Ferric chloride Signup and view all the answers

What color does the solution turn when potassium thiocyanate is added to confirm the presence of Fe3+ ions?

Blood-red Signup and view all the answers

What compound is formed when zinc ion (Zn²⁺) is treated with hydrochloric acid?

Zinc chloride (ZnCl₂) Signup and view all the answers

What is the color of the flame produced during the flame test for barium ions (Ba²⁺)?

Apple-green Signup and view all the answers

Which reagent is used to confirm the presence of zinc ions (Zn²⁺) after treatment with sodium hydroxide?

Potassium ferrocyanide Signup and view all the answers

What is the first reaction step involved in the confirmatory test for barium ion (Ba²⁺)?

Barium carbonate precipitation Signup and view all the answers

Which of the following statements about zinc hydroxide (Zn(OH)₂) is correct?

It dissolves in excess sodium hydroxide upon heating. Signup and view all the answers