D-And F-Block Elements Ques 436
Question: Compound that is both paramagnetic and coloured is
Options:
A) $ K_2Cr_2O_7 $
B) $ {{(NH_4)}_2}[TiCl_6] $
C) $ VOSO_4 $
D) $ K_3[Cu{{(CN)}_4}] $
Show Answer
Answer:
Correct Answer: C
Solution:
(1) In $ Cr_2O_7^{2-} $ , the valence shell electron configuration of Cr (VI) is $ 3d^{0} $ . Thus $ Cr(VI) $ is diamagnetic but coloured due to the charge transfer spectrum.
(2) In $ {{(NH_4)}_2} $ $ [TiCl_6] $ , the valence shell electron configuration of Ti (IV) is $ 3d^{0} $ , thus, V (IV) is diamagnetic and colourless.
(3) In $ VOSO_4 $ , the valence shell electon configuration of V (IV) is $ 3d^{0} $ , thus V (IV) is paramagnetic and blue coloured due to d-d transition.
(4) In $ K_3[Cu{{(CN)}_4}] $ , the valence shell electon configuration of Cu (I) is $ 3d^{0} $ , thus Cu (I) is diamagnetic and colourless.
