1.

Which of the following statement is are correct ?

Answer»

`S_2O-8^(2-)` oxidises `Ag^(+)` in presence of pyridine and give red colour compound
`MnO_4^(2-)` disproportionates to yield `MnO_4^(-)` and `MnO_2` in presence of `H^+` ions
In `Cr_2O_7^(2-)` each Cr is linked to four OXYGEN atoms
`Ti^(2+)` is coloured while `Ti^(4+)` is colourless in AQUEOUS solution

Solution :(A)`2Ag^(+)+S_2O_8^(2-)to2Ag^(2+)+2SO_4^(2-) , Ag^(2+)+4pyto[Ag(py)_4]^(2+)` (red)
(B)`3MnO_4^(2-)+4H^(+)to2MnO_4^(-)+MnO_2+2H_2O`
(C )
(D) The colour of the complex ion is ATTRIBUTED to the presence of unpaired electron with is/are able to under go d-d transition in visible light. `Ti^(2+)` has two unpaired electrons. So, d-d transition electron is possible while `Ti^(4+)` has no electrons in the d-orbitals.


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