1.

(a) Complete the following chemical equations for reactions in aqueous media : (i) Cr_(2)O_(7)^(2-)+H^(+)+Fe^(2+)to (ii) MnO_(4)^(-)+I^(-)+H^(+)to (b) How many unpaired electrons are present in Mn^(2+) ion (At. no. of Mn = 25] ? How does it influence magnetic behaviour of Mn^(2+) ions ?

Answer»

Solution :Completed reactions are given as under :
(a) (i) `Cr_(2)O_(7)^(2-)+14H^(+)+6Fe^(2+)to2Cr^(3+)+6Fe^(3+)+7H_(2)O`
(ii) `2MnO_(4)^(-)+10I^(-)+16H^(+)to 2MN^(2+)+8H_(2)O+5I_(2)`
(b) `Mn^(2+) : 3d^(5)4s^(0)` has 5 UNPAIRED electrons. It is HIGHLY paramagnetic and it is attracted by magnet.


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