Question

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:
A. 2
B. `0.20`
C. `0.1`
D. `1.0`

Answer 1

Correct Answer - D
Moles of pure `CuSO_4=0.12`=moles of `Na_2S_2O_3` reacted with `l_2`
Moles of `Na_2S_2O_3=120xx10^(-3)xxM=0.12`