1.

Which of the following conversions can be carried out by both acidified K_(2)Cr_(2)O_(4) and acidified KMnO_(4)? (i) Fe^(2) to Fe^(3+)+e^(-) (ii) I^(-) to IO_(3)^(-) (iii) I^(-) to I_(2) (iv) H_(2)S to S

Answer»

(i) and (iii)
(II) and (IV)
(i),(iii) and (iv)
(i), (ii) and (iii)

Solution :`I^(-)` is converted to `IO_(3)^(-)`by neutral or faintly alkaline `MnO_(4)^(-)` as shown below.
`2MnO_(4)^(-)+H_(2)O+I^(-) to 2MnO_(2)+2OH^(-)+IO_(3)^(-)`


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