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Why is it essential to boil off H(2)S ga...

Why is it essential to boil off `H_(2)S` gas before proceeding to group III

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otherwise the sulphides of group IV will also be precipitated along with precipitate of group III.
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CENGAGE CHEMISTRY-QUALITATIVE INORGANIC SALT ANALYSIS-Viva Voce Questions And Part-C (Analysis Of Cations)
  1. Why do we Prefer HCl for preparing solution of cations?

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  2. Is it advisable to use conc. HCI in place of dilute HCI for preparing ...

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  3. Why is it essential to boil off H(2)S gas before proceeding to group I...

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  4. Can the solution be acidified with HNO(3) in group II before passing H...

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  5. What can it be, if the precipitate of group I is soluble in hot water ...

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  6. Why is H(2)SO(4) never employed for preparing original solution for th...

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  7. Group I filtrate is made moderately acidic before proceeding to group ...

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  8. What is the

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  9. Why do we add excess of NH(4)Cl and NH(4)OH in the precipitation of gr...

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  10. Why is it essential to oxidise ferrous salt to ferric salt in group II...

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  11. Can NH(4)Cl be replaced by any other ammonium salt for the precipitati...

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  12. How will you distinguish between ferrous and ferric salts?

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  13. Can we add NH(4)OH first and NH(4)Cl later in the analysis of group II...

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  14. Can we use NaCla and NaOH in place of Na(4)Cl and NH(4)OH in the group...

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

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

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

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

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

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

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