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Why are the group IV cations not precipi...

Why are the group IV cations not precipitated as sulphides on passing `H_(2)S` gas through group II solution?

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To answer the question, "Why are the group IV cations not precipitated as sulphides on passing H₂S gas through group II solution?", we can break down the explanation into several steps: ### Step-by-Step Solution: 1. **Understanding Group II and Group IV Cations**: - Group II cations (like Ba²⁺, Sr²⁺, Ca²⁺) typically precipitate as sulfides when H₂S gas is passed through their solutions. - Group IV cations (like Zn²⁺, Cd²⁺, Pb²⁺) have different solubility characteristics. ...
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What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H_(2)S (g) is passed through this solution?

Cus is not precipitated by passing H_(2)S through copper sulphate solution containing KCN. Give reason

The pair (s) where both the ions are precipitated upon passing H_(2)S gas in the presence of dilute HCl is (are) :

White substance dissolves in hot water. A black precipitate appears on passing H_(2)S gas in its aqueous solution. The black precipitate dissolves in hot HNO_(3) . A white precipitate is obtained on adding concentrated H_(2)SO_(4) in its solution. This white precipitate is of

H_(2)S is passed through the solution in an acididc medium to precipitate the sulphides of group II cations, but in an alkaline medium to precipitate the sulphides of group IV cations because:

A solution containing a group-IV cation gives a precipitate on passing, H_(2)S . A solution of this precipitate in dil. HCl produces a white precipitate with NaOH solution and bluish-white precipitate with basic potassium ferrocyanide. The cation is :

In equalitative analysis, cations of graph II as well as group IV both are precipitated in the form of sulphides. Due to low value of K_(sp) of group II sulphides, group reagent is H_(2)S in the presence of dil. HC1 , and due to high value of K_(sp) of group IV sulphides, group reagent is H_(2)S in the presence of NH_(4)OH and NH_(4)C1 . In a solution containing 0.1M each of Sn^(2+), Cd^(2+) , and Ni^(2+) ions, H_(2)S gas is passed. K_(sp) of SnS = 8 xx 10^(-29), K_(sp) of CdS = 15 10^(-28), K_(sp) of NiS - 3 xx 10^(-21), K_(1) of H_(2)S = 1 xx 10^(-7), K_(2) of H_(2)S = 1 xx 10^(-14) At what value of pH, NiS will start to precipitate?

In equalitative analysis, cations of graph II as well as group IV both are precipitated in the form of sulphides. Due to low value of K_(sp) of group II sulphides, group reagent is H_(2)S in the presence of dil. HC1 , and due to high value of K_(sp) of group IV sulphides, group reagent is H_(2)S in the presence of NH_(4)OH and NH_(4)C1 . In a solution containing 0.1M each of Sn^(2+), Cd^(2+) , and Ni^(2+) ions, H_(2)S gas is passed. K_(sp) of SnS = 8 xx 10^(-29), K_(sp) of CdS = 15 10^(-28), K_(sp) of NiS - 3 xx 10^(-21), K_(1) of H_(2)S = 1 xx 10^(-7), K_(2) of H_(2)S = 1 xx 10^(-14) Which of the following sulphides is more soluble in pure water?

In equalitative analysis, cations of graph II as well as group IV both are precipitated in the form of sulphides. Due to low value of K_(sp) of group II sulphides, group reagent is H_(2)S in the presence of dil. HC1 , and due to high value of K_(sp) of group IV sulphides, group reagent is H_(2)S in the presence of NH_(4)OH and NH_(4)C1 . In a solution containing 0.1M each of Sn^(2+), Cd^(2+) , and Ni^(2+) ions, H_(2)S gas is passed. K_(sp) of SnS = 8 xx 10^(-29), K_(sp) of CdS = 10^(-28), K_(sp) of NiS - 3 xx 10^(-21) K_(1) of H_(2)S = 1 xx 10^(-7), K_(2) of H_(2)S = 1 xx 10^(-14) If 0.1M HC1 is mixed in the solution containing only 0.1 M Cd^(2+) ions and saturated with H_(2)S , then [Cd^(2+)] remaining in the solution after CdS stopes to precipitate is:

In equalitative analysis, cations of graph II as well as group IV both are precipitated in the form of sulphides. Due to low value of K_(sp) of group II sulphides, group reagent is H_(2)S in the presence of dil. HC1 , and due to high value of K_(sp) of group IV sulphides, group reagent is H_(2)S in the presence of NH_(4)OH and NH_(4)C1 . In a solution containing 0.1M each of Sn^(2+), Cd^(2+) , and Ni^(2+) ions, H_(2)S gas is passed. K_(sp) of SnS = 8 xx 10^(-29), K_(sp) of CdS = 15 10^(-28), K_(sp) of NiS - 3 xx 10^(-21), K_(1) of H_(2)S = 1 xx 10^(-7), K_(2) of H_(2)S = 1 xx 10^(-14) If H_(2)S is passed into the above mixture in the presence of HC1 , which ion will be precipitated first?

CENGAGE CHEMISTRY ENGLISH-QUALITATIVE INORGANIC SALT ANALYSIS-Viva Voce Questions And Part-C (Analysis Of Cations)
  1. Can we use NaCla and NaOH in place of Na(4)Cl and NH(4)OH in the group...

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  2. Why are Zn,MnNi,Co not precipitated n the group III as hydroxides?

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  3. Why are the group IV cations not precipitated as sulphides on passing ...

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  4. Why is a brownish ppt. obtained in group II even if iron aluminium and...

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  5. Why sometimes, a black coloured precipitate obtained in group IV even ...

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  6. Why excess of NH(4)OH is used in precipitating the sulphides of group ...

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  7. Why sometimes colloidal precipitate is obtained in group IV? Comment

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  8. Why is NH(4)Cl essential in the precipitation of group V cations?

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  9. Does the excess of NH(4)Cl affect the precipitation of group V cations...

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  10. Why are all aqueous solution of the cobaltous salts pink?

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  11. At times NH(4)OH is added before adding (NH(4))(2)CO(3) to precipitate...

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  12. Na(2)CO(3) cannot be used in place of (NH(4))(2)CO(3) for the precipit...

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  13. Why is CaSO(4) not precipitated on adding ammonium sulphate to a solut...

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  14. At times warming is suggested while precipitating group V cation. Expl...

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  15. Na(2)CO(3) cannot be used in place of (NH(4))(2)CO(3) for the precipit...

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  16. Why do we test group V cations in the order of Ba, Sr, and Ca?

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  17. Why is only acetic acid employed for dissolving the group V ppt.?

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  18. Sometimes no precipitate is obtained even if group V radicals are pres...

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  19. Calcium oxalate is soluble in dilute HCl. Explain.

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  20. Why is a precipitate of magnesium carbonate not fomred along with the ...

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