1.

Which of the following statement is correct for the thiosulphate test ?

Answer»

Thiosulphate IONS reduce `Fe^(3+)` to `Fe^(2+)` in aqueous solution
It can be prepared by OXIDATION of polysuphides
The reaction of thiosulphate with iodine is the basis of iosometric tiration in analytical chemistry
Chlorine oxidizes thiosulphate and this has LED to the USE of thiosulphate to remove excess chlorine in the bleaching industries

Solution :`(A)2S_2O_3^(2-)+2Fe^(3+)toS_4O_6^(2-)+2Fe^(2+)`
`(B)2Na_2S_3+3O_2(g)overset(Delta)to2Na_2S_2O_3+2S`
(C )`1//2I_2(aq)+e^(-)toI^(-)(aq),E^(o+)=+0.54 V`
`S_2O_3^(2-)(aq)+I_2(aq)toS_4O_6^(2-)(aq)+2I^(-)(aq)`
(D)`Na_2S_2O_3 + 4Cl_2 + 5H_2O to 2NaHSO_4 + 8HCl`


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