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In the detection of halogen, nitric acid...

In the detection of halogen, nitric acid is added to the Lassaigne's extract. Its main function is to :

A

oxidise the solution

B

destroy NaCN and `Na_2S` which otherwise interfere in the test

C

make the reaction fast

D

provide a medium for the precipitation.

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The correct Answer is:
B
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MODERN PUBLICATION-APPENDIX A-Multiple Choice Questions (Level-I)
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  2. In Lassaigne's test for N, the blue colour is due to the formation of ...

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

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

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

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

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

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

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

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

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

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  12. Which of the following is a lyophobic colloid?

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

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  14. Borax bead test is not given by :

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

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

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

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

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  19. Which of the following statement is not correct when a mixture of NaCl...

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  20. Solution of a chemical compound 'X reacts with AgNO3 solution to form ...

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