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Black precipitate of copper sulphide dis...

Black precipitate of copper sulphide dissolves in:

A

KCN solution

B

sodium sulphide solution

C

sodium hydroxide

D

boiling dilute (M) sulphuric acid

Text Solution

Verified by Experts

The correct Answer is:
A
`[Cu(CN)_(4)]^(3-)` is formed.
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GRB PUBLICATION-SALT ANALYSIS-H: IInd Group Cations
  1. In blue solution of copper sulphate excess of KCN is added then soluti...

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  2. BiCl(3) +KI rarr (X) overset(KI)underset(("excess"))rarr (Y) Colour ...

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  3. Black precipitate of copper sulphide dissolves in:

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  4. Which one among the following pair of ions cannot be separated by H(2)...

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  5. A metal nitrate reacts with KI to give a black precipitate which on ad...

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  6. Identify the correct order of solubility of Na(2)S,CuS and ZnS in aque...

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  7. A solution of a metal ion when treated with KI gives a red precipitate...

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  8. Which of the following pairs comprise red precipitates?

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  9. Which one among the following pairs of ions cannot be separated by H(2...

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  10. Which of the following is not precipitated as sulphide by passing H(2)...

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  11. Which of the following metal cation is reduced from its higher oxidati...

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  12. A coloured solution of an inorganic salt reacts with potassium thiocya...

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  13. Which of the following reagents gives a yellow precipitate with a hot ...

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  14. Select the incorrect statement.

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  15. Aq. Suspension of a yellow substance (A) overset(KI)underset("conc.sol...

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  16. Brown ppt.(A) dissolve in HNO(3) gives (B) which gives white ppt. (C) ...

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  17. Colourless solutions of the following four salts are placed separately...

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  18. Identify the hydrated blue salt which when treated with KI solution, a...

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  19. Which of the following is soluble is yellow ammonium sulphide?

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  20. A solution of concentrated aqueous ammonia is added dropwise to 1mL of...

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