Chemistry Problems
- structure_of_atom_ Question 76
- Chemical Bonding And Molecular Structure Vsepr Theory Question 38
- Redox Reactions Self Evaluation Test Redox Reactions Question 59
- The P-block Elements-i Boron Family Question 33
- Thermodynamics Topic Test Thermo Chemistry Thermodynamics Question 34
- Equilibrium Topic Test Chemical Equilibrium 6 5 21 Question 39
- Equilibrium Topic Test Ionic Equilibrium Question 34
- The S-block Elements Self Evaluation Test The S Block Elements Question 21
- Organic Chemistry Some Basic Principles & Techniques Self Evaluation Test Organic Chemistry Some Basic Principles Techniques Question 17
- Hydrocarbons Alkyne Question 105
- Solutions Topic Test Solutions Question 10
- Electrochemistry Self Evaluation Test Electrochemistry Question 100
- Chemical Kinetics Rate Law And Rate Constant Question 134
- The D-and F-block Elements Self Evaluation Test The D And F Block Elements Question 25
- Coordination Chemistry Numerical Value Type Questions Coordination Compounds Question 14
- Haloalkanes And Haloarenes Self Evaluation Test Haloalkanes And Haloarenes Question 11
- Alcohols Phenols And Ethers Properties Of Alcohol Phenol And Ethers Question 224
- Aldehydes Ketones Preparation Question 9
- Nitrogen Containing Compounds Introduction Of Nitrogen Containing Compounds Question 8
- Biomolecules Fats And Lipids Question 27
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- Ionic-Equillibrium-5-Problem-1
The D-and F-block Elements Self Evaluation Test The D And F Block Elements Question 25
Question: Out of $ {{[TiF_6]}^{2-}},{{[CoF_6]}^{3-}},Cu_2Cl_2 $ and $ {{[NiCl_4]}^{2-}} $ of (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28), the colourless species are:
Options:
A) $ Cu_2Cl_2, $ and $ {{[NiCl_4]}^{2-}} $
B) $ {{[TiF_6]}^{2-}} $ and $ Cu_2Cl_2, $
C) $ {{[CoF_6]}^{3-}} $ and $ {{[NiCl_4]}^{2-}} $
D) $ {{[TiF_6]}^{2-}} $ and $ {{[CoF_6]}^{3-}} $
Answer:
Correct Answer: B
Solution:
[b] The colour exhibited by transition metal ions is due to the presence of unpaired electrons in d-orbitals which permits the d - d excitation of electrons. In $ {{[TiF_6]}^{2-}}-Ti $ is in + 4 O.S.; $ 3d^{0} $ -colourless In $ {{[CoF_6]}^{3-}} $ -Co is in +3 O.S; $ 3d^{5} $ -coloured In $ Cu_2Cl_2 $ -Cu is in + 1 O.S.; $ 3d^{10} $ - colourless In $ {{[ NiCl_4 ]}^{2-}} $ -Ni is in + 2 O.S; $ 3d^{8} $ -coloured
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