Consider the following two statements.
Statement I: [Ni(H2O)6]2+ is of green colour
Statement II: [Ni(CN)4]2– is colourless
Consider the following two statements.
Statement I: [Ni(H2O)6]2+ is of green colour
Statement II: [Ni(CN)4]2– is colourless
Option 1 -
Statement I is true, statement II is false
Option 2 -
Statement I is true, statement II is true
Option 3 -
Statement I is false, statement II is true
Option 4 -
Statement I is false, statement II is false
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1 Answer
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Correct Option - 2
Detailed Solution:[Ni (H2O)6]2+ Þ Ni2+ is octahedral and [Ni (CN)4]2– is square planar.
In [Ni (H2O)6]2+ Þ Ni2+ has two unpaired electrons and in [Ni (CN)4]2– Þ Ni2+ has no unpaired electrons. [Ni (H2O)6]2+ is coloured as it absorbs red light due to suitable d-d transition and complementary light emitted is green.
[Ni (CN)4]2– has strong field ligand so the electrons of Ni2+ pair up and it is colourless as it cannot absorb light from visible region.
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