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 +1B. The algebraic sum of all oxidation numbers in a compound is zeroC. An element in the free or the uncombined state bears oxidation number zeroD. In all its compounds, the oxidation number of fluroine is -1

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

1.	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 +1B. The algebraic sum of all oxidation numbers in a compound is zeroC. An element in the free or the uncombined state bears oxidation number zeroD. In all its compounds, the oxidation number of fluroine is -1
Answer» Correct Answer - 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)` molecule. All the other three statements (b), ( c) and (d) are correct

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`0.80 g` of sample of impure potassium dichromate was dissolved in water and made up to `500 mL` solution. `25 mL` of this solution treated with excess of `KI` in acidic medium and `I_(2)` liberated required `24 mL` of a sodium thiosulphate solution. `30 mL` of this sodium thiosulphate solution required `15 mL` of `N//20` solution of pure potassium dichromate. What was the percentage of `K_(2)Cr_(2)O_(7)` in given sample?A. `73.5%`B. `75.3%`C. `36.75%`D. none of these
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