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Which space of space the space following space compound space is space not space coloured space ? left parenthesis 1 right parenthesis space Na subscript 2 left square bracket CuCl subscript 4 right square bracket left parenthesis 2 right parenthesis space Fe subscript 4 left square bracket Fe left parenthesis CN right parenthesis subscript 6 right square bracket subscript 3 left parenthesis 3 right parenthesis space Na subscript 2 left square bracket CdCl subscript 4 right square bracket left parenthesis 4 right parenthesis space Na subscript 2 CrO subscript 4 P.S: Please explain all options  
Asked by g_archanasharma | 06 Apr, 2019, 07:25: AM
answered-by-expert Expert Answer
The given compounds are 
1) Na2[CuCl4]
2) K4[Fe(CN)6]
3) Na2[CdCl4]
4) Na2[CrO4]
 
The outer electronic configuration of Cu2+, Fe2+ and Cr2+ is 3d9, 3d6 and 3d5 respectively.
That is they contains 1, 4 and 4 unpaired electrons respectively.
But, in Cd2+ the outer shell is completely filled.(4d10).
Hence,  Na2[CdCl4] is colourless.
Answered by Varsha | 07 Apr, 2019, 19:48: PM

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