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Fe drops of conc. HNO3 are added to grou...

Fe drops of conc. `HNO_3` are added to group II filtrate before proceeding for group III in order to :

A

make acidic medium

B

convert `Fe^(2+) " to " Fe^(3+) `

C

convert `Fe^(3+) " to " Fe^(2+) `

D

boil off `H_2S` gas from the filtrate .

Text Solution

Verified by Experts

The correct Answer is:
B
Conc. `HNO_3` is added after group II to convert `Fe^(2+) " to " Fe^(3+)` so that it may be precipitated as `Fe(OH)_3`
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MODERN PUBLICATION-APPENDIX A-Multiple Choice Questions (Level-I)
  1. Which of the following statement is not correct ?

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  2. Fe , Al and Cr are grouped together in qualitative analysis because :

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  3. Fe drops of conc. HNO3 are added to group II filtrate before proceedin...

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  4. An inorganic salt when heated evolves a colourless gas which bleaches ...

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  5. Borax when heated on platinum wire forms a glass - like bead which is...

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  6. Aqueous solution of an acetate salt, when heated with FeCl3 solution g...

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  7. Nitric acid is generally not used for preparing original solution in ...

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  8. Acidified K2Cr2O7 solution turns green by:

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  9. Which of the following statement is not correct ?

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  10. Which of the following statement is not true ?

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  11. The enthalpy of neutralisation of all strong acids with strong bases i...

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  12. Carboxylic acid group can be tested by all the following tests except

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  13. 2, 4-Dinitrophenylhydrazine test is used for :

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  14. Alcohols react with ceric ammonium nitrate reagent and give :

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  15. Ferric chloride (neutral) reacts with catechol to give :

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  16. Tollen's reagent test can be performed to detect :

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  17. Iodoform test is characteristic of:

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  18. Buff colour is produced by the reaction of neutral FeCl3 with:

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  19. Which of the following organic compound gives carbylamine test ?

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  20. Azo dye test is used to distinguish between :

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