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H(2)S in the presence of HCl precipitate...

`H_(2)S` in the presence of `HCl` precipitates `II` group but not `IV` group because:

A

Ionisation of `H_(2)S` is increased

B

Ionisation of `H_(2)S` is decreased

C

Precipitation of `Pb^(+2)` is avoided

D

Precipitated of `Mn^(+2)` as sulphide is facilitated

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Mg is not precipitated in V group because:

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?

NARAYNA-QUALITATIVE ANALYSIS-LEVEL -I (C.W.)
  1. The ion which is not precipitated by H2 S in the presence of HCl is

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  2. Na(2)CO(3)+KNO(3) to No reaction

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  3. Ca, Ba and Sr ions are precipitated in fifth group as their -

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  4. When H(2)S is passed through an ammonical salt solution X, a white pr...

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  5. In third group, bromine water is used to test

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  6. In the reaction : H(2)ShArr2H^(+)+S^(2-), when NH(4)OH is added, then

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  7. An aq. Solution containing Hg^(2+),Pb^(2+) and Cd^(2+) ions is mixed w...

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  8. Disodium hydrogen phosphate is used to test

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  9. Which of the following statement is // are true ?

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  10. The metal ion which is precipitated when H(2)S is passed with HCl is

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  11. The group reagent for group V radicals is

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  12. Aqua regia is

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  13. Which of the following will be precipitated when dil. HCl is added to ...

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  14. H(2)S in the presence of HCl precipitates II group but not IV group be...

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  15. A black sulphide is formed by the action of H(2)S on

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  16. The ion which can be precipitated with both HCl and H(2)S separately i...

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  17. Which of the following pairs of cations cannot be separated by using a...

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  18. Which of the following is insolublein yellow ammonium polysulphide?

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  19. The ion which is not precipitated by H2 S in the presence of HCl is

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  20. Which of the following pairs of cations cannot be separated by adding ...

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