oxidation states available for a particular elements are normally more than the valencies A brown complex has the formula: `[Fe(H_(2))(O)_(5)NO]SO_(4)` the oxidation number of iron is: In which of the following pairs there is the maximum difference in the oxidaation state of the elements other than oxygen?A. `NO_(2) and N_(2)O_(4)`B. `P_(2)O_(5) andP_(4)O_(10)`C. `K_(2)mNo_(4)N_(2)O and NO`D. `SO_(2) and SO_(3)`

oxidation states available for a particular elements are normally more

1.	oxidation states available for a particular elements are normally more than the valencies A brown complex has the formula: `[Fe(H_(2))(O)_(5)NO]SO_(4)` the oxidation number of iron is: In which of the following pairs there is the maximum difference in the oxidaation state of the elements other than oxygen?A. `NO_(2) and N_(2)O_(4)`B. `P_(2)O_(5) andP_(4)O_(10)`C. `K_(2)mNo_(4)N_(2)O and NO`D. `SO_(2) and SO_(3)`
Answer» Correct Answer - D O.N of N in `NO_(2)and N_(2)O_(4)` are +4 (same). O.N of P in `P_(2)O_(5) and P_(4)O_(4) are +5(same)` O.N of N in `N_(2)O is +1 and NO is +2 (difference=1)` O.N of S in `SO_(2) is (+4) and SO_(3)` is (+6)(dfference=2)

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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
`12. g` of an impure sample of arsenious oxide was dissolved in water containing `7.5 g` of sodium bicarbonate and the resulting solution was diluted to `250 mL`. `25 mL` of this solution was completely oxidised by `22.4 mL` of a solution of iodine. `25 mL` of this iodine solution reacted with same volume of a solution containing `24.8 g` of sodium thiosulphate `(Na_(2)S_(2)O_(3).5H_(2)O)` in one litre. Calculate teh percentage of arsenious oxide in the sample ( Atomic mass of `As=57`)
The unbalanced equation for the reaction of `P_(4)S_(3)` with nitrate in aqueous acidic medium is given below : `P_(4)S_(3)+NO_(3)^(-)rarrH_(3)PO_(4)+SO_(4)^(2-)+NO` the number of moles of water reuired per mole of `P_(4)S_(3)` is :A. 18B. `(8)/(3)`C. 8D. 28
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Balance the following equations: (i) `Cr_(2)O_(7)^(2-)+I^(-)+H^(+)rarrCr^(3+)+I_(2)+H_(2)O` (ii) `Ag^(+)+AsH_(3)rarrH_(3)AsO_(3)+H^(+)+....`
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