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Dichromate titrations - oxidation reduction titrations
These are titrations where, potassium dichromate is utilized as an oxidising agent in acidic medium. The medium is organized acidic by the make use of dilute sulphuric acid. The potential reaction is
K2Cr2O7 + 4h2SO4 → K2SO4 + Cr2 (SO4)3 + 4 H20 + 3[O]
OR Cr2 O2-7 + 14 H+ + 6e- → 2 CR3+ + 7 H2O
The solution of potassium dichromate can be directly employed for titrations. It is generally used for the estimation of ferrous salts and iodides. In the titration of K2Cr2O7 versus ferrous salt either an external indicator that is potassium ferricyanide or an internal indicator that is diphenyl amine can be used.
In covalency : (1) Electrons are transferred (2) Electrons are equally shared (3) The electron of one atom are shared between two atoms (4) None of the above Ans: E
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The number of species participating in the slowest step of the reaction is known as molecularity of the reaction.
WRITE HALF-REACTION FOR THE REDOX Fe2+ + MnO4- =Fe3+ + Mn2+
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