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Estimation of reducing substances by the...

Estimation of reducing substances by the use of standard `I_(2)`,
`I_(2)+2S_(2)O_(3)^(2-)rarr S_(4)O_(6)^(2-)+2I^(Theta)` is called

A

Iodimetry

B

Iodometry

C

Both A and B

D

None.

Text Solution

Verified by Experts

The correct Answer is:
A
Iodimetry : It involves the direct titration of reducing agent (like thiosulphate) with standard iodine solution.
Iodometry : In these titrations, iodine is firstly liberated by treatment of KI with oxidising agent and then this liberated iodine is titrated with reducing agent.
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I_(2)+S_(2)O_(3)^(2-) to

I_(2)+S_(2)O_(3)^(2-) to I^(-)+S_(4)O_(6)^(2-)

Estimation of oxidising substance involving the liberation of I_(2) and subsequent volumetric estimation of I_(2) are refferred to as 2Cu^(2+)+4I^(Theta)rarr Cu_(2)I_(2)+I_(2) I_(2)S_(2)O_(3)^(2-)rarr S_(4)O_(6)^(2-)+2I^(Theta)

(a). IF both (A) and (R) are correct and (R) is the correct explanation of (A). (b). If both (A) and (R) are correct but (R) is not the correct explanation of (A). (c). If (A) is correct, but (R) is incorrect. (d). If (A) is incorrect, but (R) is correct. ltbr. (e) if both (A) and (R) are incorrect. Q. Assertion (A): Estimation of reducing substance by the use of standard I_(2) is called iodometry. Reason (R): in the reaction I_(2)+S_(2)O_(3)^(2-)toS_(4)O_(6)^(2-)+2I^(ɵ) The n factor of S_(2)O_(3)^(2-) is one.

Consider the redox reaction 2S_(2)O_(3)^(2-)+I_(2)rarrS_(4)O_(6)^(2-)+2I^(ө)