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The oxidation number of an element in a ...

The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following rules is not correct in this respect ?

A

The oxidation number of hydrogen is always `+1`

B

The algebraic sum of all the oxidation numbers in a compound is zero.

C

An element in the free or the uncombined state bears oxidation number zero.

D

In all its compounds, the oxidation number of fluorine is `-1`.

Text Solution

Verified by Experts

The correct Answer is:
A
Oxidation number of hydrogen is always `+1` is a wrong rule since, it is `+1` in hydrogen halides, `-1` in hydrides and zero in `H_(2)` molecules.
All the other three statements (b) , ( c) and (d) are correct.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-REDOX REACTIONS-Exercise 2
  1. The oxidation number of an element in a compound is evaluated on the b...

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  2. Hot concentrated sulpuric acis is a moderatly strong oxidizing agent. ...

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  3. Choose the disproportionation reaction among the following redox react...

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  4. In which of the following reactions, H(2)O(2) acts as a reducing agent...

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  5. Observe the following reaction, 2NO(2)(g) + 2OH^(-)(aq) to NO(3)^(-)...

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  6. In acidic medium, H(2)O(2) changes Cr(2)O(7)^(2-) to CrO(5) which has ...

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  7. The oxidation number of Cr in K(2)Cr(2)O(7) is

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  8. Oxidation number of sulphur in Na(2)S(2)O(3) is

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  9. Both oxidation and reduction takes place in

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  10. The oxidant which cannot act as a reducing agent is

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  11. In the reaction Ag(2)O+H(2)O(2) rarr 2Ag+H(2)O+O(2),H(2)O(2) acts as

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  12. A compound contains three elements A,B and C, if the oxidation number ...

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  13. Which of the following is the example of a disproportionation reaction...

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  14. Which combination appears odd with respect to oxidation number per ato...

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  15. Nitric oxide acts as a reducing agent in which of the following reacti...

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  16. In which of the following, increasing orders the oxidation number of o...

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  17. In the reaction 3Br(2) + 6CO(3)^(2-) + 3H(2)O to 5Br^(-) + 2BrO(3)^(...

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  18. MnO(4)^(-) is a good oxidising agent in different medium changing to ...

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  19. The reaction, 10FeSO(4) + 2KMnO(4) + 8H(2)SO(4) to 2MnSO(4) + 5Fe(2)...

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  20. Which of the following is a redox reaction?

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  21. Given, xNa(2)HAsO(3) + y NaBrO(3) + z HCl to NaBr + H(3) AsO(4) + NaCl...

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