Which of the following is correct ?A. Oxidation fo a substance is followed by reduction of another substanceB. Reduction of a substance is followed by oxidation of another substance.C. Oxidation and reduction are complementary processesD. All of these

Which of the following is correct ?A. Oxidation fo a substance is foll

1.	Which of the following is correct ?A. Oxidation fo a substance is followed by reduction of another substanceB. Reduction of a substance is followed by oxidation of another substance.C. Oxidation and reduction are complementary processesD. All of these
Answer» Correct Answer - C Oxidation and reduction always occur simultaneously, and to the same exent, in ordinary chemical reactions. For brevity, we usually call oxidation-reduction reactions as redox reactions.

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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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Which of the following is correct ?A. Oxidation fo a substance is followed by reduction of another substanceB. Reduction of a substance is followed by oxidation of another substance.C. Oxidation and reduction are complementary processesD. All of these

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