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In iodometric estimation of Cu^(2+) ion,...

In iodometric estimation of `Cu^(2+)` ion, the following reaction took place
`2Cu^(2+)+4ItoCu_(2)I_(2)+I_(2)`
`I_(2)+2Na_(2)S_(2)O_(3)to2NaI+Na_(2)S_(4)O_(6)`
If 100mL OF `CuSO_(4)` solution added to excess KI requires 50mL of 0.2M `Na,S_(2)O_(3)` the molarity of `CuSO_(4)` solution is :

A

`0.05 M`

B

`0.1 M`

C

`0.2 M`

D

`0.25 M`

Text Solution

Verified by Experts

The correct Answer is:
b
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In a iodomeric estimation, the following reactions occur 2Cu^(2+)+4i^(-) to Cu_(2)I_(2)+I_(2), I_(2)+2Na_(2)S_(2)O_(3) to 2NaI+Na_(2)S_(4)O_(6) 0.12 mole of CuSO_(4) was adde to excess of KI solution and the liberated iodine required 120mL of hypo. The molarity of hypo soulution was:

AgI darr+2Na_(2)S_(2)O_(3) to Na_(3)[Ag(S_(2)O_(3))_(2)]+NaI

Find the n factor of Na_(2) S_(2) O_(3) in the following reactions. Na_(2) S_(2) O_(3) + I_(2) rarr NaI + Na_(2) S_(4) O_(6)

For the following reaction I_(2)+2Na_(2)S_(2)O_(3)rarr2NaI+Na_(2)S_(4)O_(6) The incorrect statement is

Na_(2)S_(2)O_(3)+I_(2)rarr Product is

In this reaction 2Na_(2)S_(2)O_(3)+I_(2)=Na_(2)SO_(4)O_(6)=2NaI_(2) acts as:

Na_(2)S_(4)O_(6) and Na_(2)S_(3)O_(6) compounds are different in :

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