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Question

Which of the following statements are correct concerning redox properties?

(i) A metal M for which Efor the half cell reaction Mn++ne M is very negative and will be a good reducing agent

(ii) The oxidizing power of the halogens decreases from chlorine to iodine

(iii) The reducing power of hydrogen halides increases from hydrogen chloride to hydrogen iodide
  1. (i), (ii) and (iii)
  2. (i) and (ii)
  3. (i) only
  4. (ii) and (iii) only


Solution

The correct option is A (i), (ii) and (iii)
Explanation :

(i) High – ve E value means lower reduction potential which means, the metal M is a good reducing agent.

(ii) Reduction potential of Cl, Br and I are respectively: + 1.36 V, 1.06 V and 0.54 V. Higher reduction potential means, good oxidising agent. Thus, oxidising power decreases from ClBrI

(iii) Larger the size of halogen atom, weaker the bond and easier is the tendency to given hydrogen. Thus, stronger is the reducing power. As size of halogen Cl<Br<I , thus, the reducing power of HCl<HBr<Hl

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