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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 ofhydrogen is always+ 1.

B

The algebraic sum of aJ1 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 offluorine is -1

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A
(a)
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DISHA PUBLICATION-REDOX REACTIONS-EXERCISE-1 : CONCEPT BUILDER ( TOPICWISE )
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  2. The oxide which cannot act as reducing agent is

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  3. The oxidation number of an element in a compound is evaluated on the b...

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  4. The oxidation states of the most electronegative elements in the produ...

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  5. Which of the following statements is not correct?

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  6. The3ClO^(-)(aq.)to ClO(3)^(-)(aq.)+2Cl^(-)(aq.) is an example of

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  7. For the reaction : NH3 + OCI^(-) rarr N2H4 + Cl^(-) in basic medium, t...

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  8. Which of the following reactions involve disproportionation ?

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  9. In a balanced equation H(2)SO(4)+xHI rarr H(2)S+YI(2)+zH(2)O, the valu...

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  10. KMnO4 oxidises oxalic acid in acidic medium. The number of CO2 molecul...

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  11. In the chemical reaction, K2 Cr2 O7 + xH2 SO4 + ySO2 rarr K2SO4 + Cr2(...

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  12. Consider the following reaction 5H2O2 +XCIO2 +2OH^(-) rarr XCI^(-)- + ...

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  13. Number of moles of K2Cr2O7 reduced by one mole of Sn^(2+) ion is

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  14. Which of the following statements is not correct?

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  15. The species that undergoes disproportionational is an alkaline medium ...

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  16. What products are expected from the desproprtionation reactin of hypoc...

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  17. Which is the best description of the behaviour of bromine in the react...

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  18. The number of electrons lost in the following change is Fe+H(2)Orarr...

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  19. When copper is treated with a certain concentration of nitric acid, ni...

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  20. Which of the following is not a disproportionation reaction? I. NH4N...

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