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Write shot notes on : (a) Electrochemi...

Write shot notes on :
(a) Electrochemical series
(b) Redox titrations
(c) Abnorma oxidation number and structures of compounds .

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Write the structure of lettered compounds (A,B,C,D)

CrO_(4) has structure as shown The oxidation number of chromium in the above compound is

Compound CrO_5 has structure as shown ltbtgt The oxidation number fo Cr in the above compound is .

Name the following: (a) A transition metal which does not exhibit variation in oxidation state in its compounds. (b) A compound where the transition metal is the +7 oxidation state. (c) A member of the lanthanoid series which is well known to exhibit +4 oxidation state. (d) Ore used in the preparation of Potassium dichromate.

Oxidation is de-electronation whereas reduction is electronation. Oxidants are the substances which oxidise others and reduced themselves. On the other hand reductants are the substances which reduce others and oxidised themselves. The oxidation number of an element in a compound decides its nature to act as oxidant or reductant. Oxidation-reduction occur simultaneously and the overal chemical change is called redox reaction. Redox reactions are of three types : (i) Intermolecular erdox reactions, (ii) Auto-redox or disproportionation reaction, and (iii) Intramolecular redox reactions. Maximum oxidation state shown by Os, Ru and Xe in their compounds is :

a. b. c. d. What is the oxidation number of Mn in (B) and oxidation number of Os in (C) ?

Cr_(2)O_(5) has structure as shown The oxidation number of chromium in the above compound is