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A black compound of manganese reacts wit...

A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with `NH_3` an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from _________ .

A

- 3 to +3

B

- 3 to 0

C

- 3 to +5

D

0 to -3

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MODERN PUBLICATION-p-BLOCK ELEMENTS-EXERCISE
  1. Which of the following are peroxoacids of sulphur?

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  2. Hot concentrated sulphuric acid is a moderately strong oxidizing agent...

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  3. A black compound of manganese reacts with a halogen acid to give green...

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  4. In the preparation of compounds of Xe, Bartlett had taken O2^(+) PtF6^...

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  5. PCl5 in solid state exists as ionic compound having cation ..............

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  6. Reduction potentials of some ions are given below. Arrange them in de...

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  7. Which of the following is isoelectronic pair?

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  8. What happens when chlorine gas is passed through a hot concentrated so...

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  9. Complete the following statement- Vitamin A is important for our body ...

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  10. Which of the following is correct for P4 molecule of white phosphoru...

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  11. Which of the following statements are correct?

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  12. Which of the following has maximum number of unpaired d electrons :

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  13. Draw lewis structure of ammonium ion .

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  14. Express 1271 in roman numbers.

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  15. Which of the following statements are correct?

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  16. In which of the following reactions conc. H2SO4 is used as an oxidisin...

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  17. Which of the following statements are true?

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  18. Match the compounds given in Column I with the hybridisation and shape...

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  19. Express 1657 in roman numbers.

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  20. Express 1272 in roman numbers.

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