Which of d following changes would b considered as redox? y? -burning of magnesium ribbon -electrolysis of water -thermal decomposition of calcium carbonate into calcium oxide and carbon dioxide -formation of sodium sulfate from sulfuric acid and NaOH
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ANSWERS: 2
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Redox means reduction or oxidation, i.e. the addition of electrons or oxygen. The burning of a Magnesium ribbon will turn it into MgO, the addition of an Oxygen atom. Thus oxidation and hence a redox reaction. Electrolysis of water merely separates the ions in water, it doesn't add any electrons or Oxygen atoms. Hence not a redox reaction. Thermal decomposition of CaCO3 into CaO & CO2 hasn't added any Oxygen nor electrons to anything and thus not a redox reaction. Forming Na2SO4 from H2SO4 & 2*NaOH will oxidate Na by putting it into another molecule & the OH will become OH^- and thus reducing it. Therefore a redox reaction.
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The answer is: hydrolysis of water because: 2H2O--->2H2 + O2 Hydrogen has a charge of +1 and has priority according to redox reaction rules: so for H2O: +2 + Oxygen=0 so Oxygen charge is -2. In 2H2: charge of H is 0. In O2: charge of O is 0 because its in its elementary form. So there is a gain of electrons hence oxidation where the charge of hydrogen changed from +2 to 0 (gained two electrons) and oxygen changed from -2 to o )lost two electrons)..hence a redox reaction
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