CoCl₄²⁻ and Co(H₂O)₆²⁺ have different colours. This is because : · ABC26IN1548
Subject: Inorganic Chemistry · Chapter: Coordination Chemistry And Colour · Topic: Coordination chemistry and colour · Exam: BHU Post-graduate Entrance Test 2014 · Marks: 2 · Difficulty: Medium
$\mathrm{CoCl_4^{2-}}$ and $\mathrm{Co(H_2O)_6^{2+}}$ have different colours. This is because :
(a)they have Co in different oxidation states
(b)$\mathrm{CoCl_4^{2-}}$ is tetrahedral while $\mathrm{Co(H_2O)_6^{2+}}$ is octahedral
(c)they have different number of unpaired electrons
(d)$\mathrm{CoCl_4^{2-}}$ is square planar while $\mathrm{Co(H_2O)_6^{2+}}$ is octahedral
Answer
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