Crystal Field Theory
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CHXII09:COORDINATION COMPOUNDS

321855 Among the following species the one which causes the highest CFSE. \({\Delta _{\text{o}}}\) as a ligand is :-

1 \(\mathrm{CN}^{-}\)
2 \(\mathrm{NH}_{3}\)
3 \(\mathrm{CO}\)
4 \(\mathrm{F}^{-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321856 Assertion :
\(\mathrm{F}^{-}\)ion is a weak ligand and forms outer orbital complex.
Reason :
\(\mathrm{F}^{-}\)ion cannot force the electrons of
\(d_{z^{2}}\) and \(d_{x^{2}-y^{2}}\) orbitals of the inner shell to occupy \(d_{x y}, d_{y z}\) and \(d_{z x}\) orbitals of the same shell.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

321857 Low spin complex of \({{\rm{d}}^{\rm{6}}}\) - cation in an octahedral field will have the following energy \(\left( {{{\rm{\Delta }}_{\rm{o}}}{\rm{ = }}} \right.\) crystal field splitting energy in an octahedral field, \(\mathrm{P}=\) electron pairing energy)

1 \(\frac{{{\text{ - 2}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + P}}\)
2 \(\frac{{{\text{ - 12}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + 3P}}\)
3 \(\frac{{{\text{ - 12}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + P}}\)
4 \(\frac{{{\text{ - 2}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + 2P}}\)
CHXII09:COORDINATION COMPOUNDS

321858 Incorrect order of splitting energy is:

1 \(\left[\mathrm{NiF}_{6}\right]^{-4} < \left[\mathrm{NiF}_{6}\right]^{-2}\)
2 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3} < \left[\mathrm{Ru}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{+3} < \left[\mathrm{Co}(\text { en })_{3}\right]^{+3}\)
4 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2} < \left[\mathrm{Ni}(\mathrm{CN})_{6}\right]^{-4}\)
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CHXII09:COORDINATION COMPOUNDS

321855 Among the following species the one which causes the highest CFSE. \({\Delta _{\text{o}}}\) as a ligand is :-

1 \(\mathrm{CN}^{-}\)
2 \(\mathrm{NH}_{3}\)
3 \(\mathrm{CO}\)
4 \(\mathrm{F}^{-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321856 Assertion :
\(\mathrm{F}^{-}\)ion is a weak ligand and forms outer orbital complex.
Reason :
\(\mathrm{F}^{-}\)ion cannot force the electrons of
\(d_{z^{2}}\) and \(d_{x^{2}-y^{2}}\) orbitals of the inner shell to occupy \(d_{x y}, d_{y z}\) and \(d_{z x}\) orbitals of the same shell.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

321857 Low spin complex of \({{\rm{d}}^{\rm{6}}}\) - cation in an octahedral field will have the following energy \(\left( {{{\rm{\Delta }}_{\rm{o}}}{\rm{ = }}} \right.\) crystal field splitting energy in an octahedral field, \(\mathrm{P}=\) electron pairing energy)

1 \(\frac{{{\text{ - 2}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + P}}\)
2 \(\frac{{{\text{ - 12}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + 3P}}\)
3 \(\frac{{{\text{ - 12}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + P}}\)
4 \(\frac{{{\text{ - 2}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + 2P}}\)
CHXII09:COORDINATION COMPOUNDS

321858 Incorrect order of splitting energy is:

1 \(\left[\mathrm{NiF}_{6}\right]^{-4} < \left[\mathrm{NiF}_{6}\right]^{-2}\)
2 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3} < \left[\mathrm{Ru}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{+3} < \left[\mathrm{Co}(\text { en })_{3}\right]^{+3}\)
4 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2} < \left[\mathrm{Ni}(\mathrm{CN})_{6}\right]^{-4}\)
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CHXII09:COORDINATION COMPOUNDS

321855 Among the following species the one which causes the highest CFSE. \({\Delta _{\text{o}}}\) as a ligand is :-

1 \(\mathrm{CN}^{-}\)
2 \(\mathrm{NH}_{3}\)
3 \(\mathrm{CO}\)
4 \(\mathrm{F}^{-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321856 Assertion :
\(\mathrm{F}^{-}\)ion is a weak ligand and forms outer orbital complex.
Reason :
\(\mathrm{F}^{-}\)ion cannot force the electrons of
\(d_{z^{2}}\) and \(d_{x^{2}-y^{2}}\) orbitals of the inner shell to occupy \(d_{x y}, d_{y z}\) and \(d_{z x}\) orbitals of the same shell.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

321857 Low spin complex of \({{\rm{d}}^{\rm{6}}}\) - cation in an octahedral field will have the following energy \(\left( {{{\rm{\Delta }}_{\rm{o}}}{\rm{ = }}} \right.\) crystal field splitting energy in an octahedral field, \(\mathrm{P}=\) electron pairing energy)

1 \(\frac{{{\text{ - 2}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + P}}\)
2 \(\frac{{{\text{ - 12}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + 3P}}\)
3 \(\frac{{{\text{ - 12}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + P}}\)
4 \(\frac{{{\text{ - 2}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + 2P}}\)
CHXII09:COORDINATION COMPOUNDS

321858 Incorrect order of splitting energy is:

1 \(\left[\mathrm{NiF}_{6}\right]^{-4} < \left[\mathrm{NiF}_{6}\right]^{-2}\)
2 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3} < \left[\mathrm{Ru}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{+3} < \left[\mathrm{Co}(\text { en })_{3}\right]^{+3}\)
4 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2} < \left[\mathrm{Ni}(\mathrm{CN})_{6}\right]^{-4}\)
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CHXII09:COORDINATION COMPOUNDS

321855 Among the following species the one which causes the highest CFSE. \({\Delta _{\text{o}}}\) as a ligand is :-

1 \(\mathrm{CN}^{-}\)
2 \(\mathrm{NH}_{3}\)
3 \(\mathrm{CO}\)
4 \(\mathrm{F}^{-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321856 Assertion :
\(\mathrm{F}^{-}\)ion is a weak ligand and forms outer orbital complex.
Reason :
\(\mathrm{F}^{-}\)ion cannot force the electrons of
\(d_{z^{2}}\) and \(d_{x^{2}-y^{2}}\) orbitals of the inner shell to occupy \(d_{x y}, d_{y z}\) and \(d_{z x}\) orbitals of the same shell.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
CHXII09:COORDINATION COMPOUNDS

321857 Low spin complex of \({{\rm{d}}^{\rm{6}}}\) - cation in an octahedral field will have the following energy \(\left( {{{\rm{\Delta }}_{\rm{o}}}{\rm{ = }}} \right.\) crystal field splitting energy in an octahedral field, \(\mathrm{P}=\) electron pairing energy)

1 \(\frac{{{\text{ - 2}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + P}}\)
2 \(\frac{{{\text{ - 12}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + 3P}}\)
3 \(\frac{{{\text{ - 12}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + P}}\)
4 \(\frac{{{\text{ - 2}}}}{{\text{5}}}{\Delta _{\text{o}}}{\text{ + 2P}}\)
CHXII09:COORDINATION COMPOUNDS

321858 Incorrect order of splitting energy is:

1 \(\left[\mathrm{NiF}_{6}\right]^{-4} < \left[\mathrm{NiF}_{6}\right]^{-2}\)
2 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3} < \left[\mathrm{Ru}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+3}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{+3} < \left[\mathrm{Co}(\text { en })_{3}\right]^{+3}\)
4 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2} < \left[\mathrm{Ni}(\mathrm{CN})_{6}\right]^{-4}\)
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