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For the detection of sulphur by Lassaign...

For the detection of sulphur by Lassaigne's test, the addition of sodium nitroprusside to the sodium extract gives purple colouration. This is due to the formation of :

A

`Na_3[Fe(CN)_6]`

B

`Na_4[Fe(CN)_5NOS]`

C

`Fe(SCN)_3`

D

`Na_4[Fe(CN)_6]`

Text Solution

Verified by Experts

The correct Answer is:
B
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MODERN PUBLICATION-APPENDIX A-Multiple Choice Questions (Level-I)
  1. The prussian blue colour in the test of nitrogen by Lassagine's soluti...

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  2. Leibig method is used for the estimation of

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  3. For the detection of sulphur by Lassaigne's test, the addition of sodi...

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  4. In Lassaigne's test for N, the blue colour is due to the formation of ...

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  5. In the detection of halogen, nitric acid is added to the Lassaigne's e...

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  6. Sodalime test for detection of nitrogen cannot be used for :

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  7. In case N and S are also present along with halogen in the organic com...

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  8. Which of the following pairs has heat of neutralisation equal to -57.1...

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  9. Which of the following neutralisation reaction is most exothermic ?

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  10. The heat of neutralisation of strong acid and strong base is 57.0 kJ. ...

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  11. During the test of N in an organic compound by Lassaigne's extract, pr...

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  12. Equal volumes of 1M HCl and 1M H2SO4 are neutralised by dilute NaOH so...

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  13. The heat of neutralisation of HCl and NaOH is 57.3 kJ "mol"^(-1). The ...

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  14. Which of the following is a lyophobic colloid?

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  15. Which of the following is a hydrophilic colloidal solution?

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  16. Borax bead test is not given by :

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  17. Which compound is formed when excess of KCN is added to an aqueous sol...

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  18. The ion that cannot be precipitated by both HCl and H2S is:

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  19. An aqueous solution of a substance 'X' gives a white ppt. on treatment...

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  20. The compound which gives white ppt. with aqueous AgNO3 and a green fla...

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