1.

On reacting copper with dilute nitric acid gives a colourless gas (A). The gas (A) on reacting with Fe^(2+) ionin concentrated sulphuric acid and water forms a brown coloured complex. The EAN of Iron in the brown coloured complex is : [Given: Atomic No.: Fe = 26]

Answer»

26
37
25
36

Solution :`Fe^(2+)(aq)+NO+underset(("CONC."))(H_(2)SO_(4))to underset(("Brown"))([Fe(H_(2)O)_(5)(NO)]^(2+))+H_(2)O`
The oxidation number of Iron in `[Fe(H_(2)O)_(5)(NO)]^(2+)rArr x + (5xx0)+1=+2 rArr x = +1`
EAN of Fe = Atomic no. of metal - no. of electrons lost + no. of electrons gained from ligands `= 26-1+12rArr 37`


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