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Solution


Q.

Identify correct statements from below:

A.  The chromate ion is square planar.
B.  Dichromates are generally prepared from chromates.
C.  The green manganate ion is diamagnetic.
D.  Dark green coloured K2MnO4 disproportionates in a neutral or acidic medium to give permanganate.
E.  With increasing oxidation number of transition metal, ionic character of the oxides decreases. 

Choose the correct answer from the options given below:                     [2024]
1 B, C, D only  
2 A, D, E only  
3 A, B, C only  
4 B, D, E only  

Ans.

(4)

       (A) The chromate ion is tetrahedral in shape.

       (B) Dichromates are prepared from chromates.

       (C) In manganate ion, Mn is in +6 oxidation state, hence has one unpaired electron and is paramagnetic.

       (D) The dark green K2MnO4 disproportionates in a neutral or acidic solution to give permanganate.

               2MnO2+4KOH+O2→2K2MnO4+2H2O

              3MnO42-+4H+→2MnO4-+MnO2+2H2O

       (E) With increase in oxidation number of central metal atom, its polarising power increases and covalent character increase and therefore, ionic character decreases.