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Fe , Al and Cr are grouped together in q...

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

A

these have three electrons in the valence shell

B

their valency is three

C

their hydroxides are insoluble in NH3

D

their sulphides are soluble in water .

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The correct Answer is:
C
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MODERN PUBLICATION-APPENDIX A-Multiple Choice Questions (Level-I)
  1. Equivalent weight of an acid may be expressed as :

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  2. Which of the following statement is not correct ?

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

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

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

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

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

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

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  9. Acidified K2Cr2O7 solution turns green by:

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  10. Which of the following statement is not correct ?

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  11. Which of the following statement is not true ?

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

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

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  14. 2, 4-Dinitrophenylhydrazine test is used for :

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

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

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

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  18. Iodoform test is characteristic of:

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

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

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