GK
ELEMENTS COMPOUNDS SUBSTANCES METALS AND NON METALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Red colour
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Blue colour
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Green colour
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Yellow colour
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Detailed explanation-1: -In hydrated CuSO4, the water molecules surrounding the Central Metal (Cu) act as ligands resulting in d-d transition and therefore emitting blue colour in the visible region due to which hydrated CuSO4 appears blue.
Detailed explanation-2: -Answer: CuSO4. 5H2O has blue colour due to the presence of water of crystallization. There is a presence of water molecules in copper sulphate.
Detailed explanation-3: -In CuSO4. 5H2O water acts as ligand and causes crystal field splitting. This makes d-d transition possible. On the other hand, in CuSO4 due to absence of ligand crystal field splitting is not possible, Hence no colour is observed.
Detailed explanation-4: -The colour of copper sulphate solution is blue.
Detailed explanation-5: -Anhydrous copper sulphate CuSO4 is colourless. In the absence of ligand (water) molecules, splitting of d orbitals is not possible.