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Why do we not prefer to prepare original...

Why do we not prefer to prepare original solution of cations in conc. `H_(2)SO_(4)` or conc. `HNO_(3)`?

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`Ba^(2+),Sr^(2+)` and `Pb^(2+)` ar precipitated as insoluble sulphates.
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CENGAGE CHEMISTRY ENGLISH-QUALITATIVE INORGANIC SALT ANALYSIS-Viva Voce Questions And Part-C (Analysis Of Cations)
  1. Can the solution be acidified with HNO(3) in group II before passing H...

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

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  3. Why do we not prefer to prepare original solution of cations in conc....

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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