Valence Bond Theory
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CHXII09:COORDINATION COMPOUNDS

322320 Read Assertion and Reason carefully and mark correct option.
Assertion :
The spin only magnetic moment value for \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\) is 1.74 B.M., whereas for \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is 5.92 B.M.
Reason :
In both complexes, Fe is present in \( + \,3\) oxidation state.

1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
4 Assertion is true but Reason is false.
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

322321 Which of the following complexes is diamagnetic and square planar?

1 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
3 \(\left[\mathrm{NiCl}_{4}\right]^{2-}\)
4 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\)
MHTCET - 2021
CHXII09:COORDINATION COMPOUNDS

322322 Which one of the following complexes will exhibit the least paramagnetic behavior?

1 \({\mathrm{\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
2 \({\mathrm{\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
3 \({\mathrm{\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
4 \({\mathrm{\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

322323 Assertion :
\(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) is square planar and diamagnetic.
Reason :
It has no unpaired electrons due to presence of strong field ligand.

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.
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CHXII09:COORDINATION COMPOUNDS

322320 Read Assertion and Reason carefully and mark correct option.
Assertion :
The spin only magnetic moment value for \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\) is 1.74 B.M., whereas for \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is 5.92 B.M.
Reason :
In both complexes, Fe is present in \( + \,3\) oxidation state.

1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
4 Assertion is true but Reason is false.
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

322321 Which of the following complexes is diamagnetic and square planar?

1 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
3 \(\left[\mathrm{NiCl}_{4}\right]^{2-}\)
4 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\)
MHTCET - 2021
CHXII09:COORDINATION COMPOUNDS

322322 Which one of the following complexes will exhibit the least paramagnetic behavior?

1 \({\mathrm{\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
2 \({\mathrm{\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
3 \({\mathrm{\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
4 \({\mathrm{\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

322323 Assertion :
\(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) is square planar and diamagnetic.
Reason :
It has no unpaired electrons due to presence of strong field ligand.

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.
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CHXII09:COORDINATION COMPOUNDS

322320 Read Assertion and Reason carefully and mark correct option.
Assertion :
The spin only magnetic moment value for \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\) is 1.74 B.M., whereas for \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is 5.92 B.M.
Reason :
In both complexes, Fe is present in \( + \,3\) oxidation state.

1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
4 Assertion is true but Reason is false.
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

322321 Which of the following complexes is diamagnetic and square planar?

1 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
3 \(\left[\mathrm{NiCl}_{4}\right]^{2-}\)
4 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\)
MHTCET - 2021
CHXII09:COORDINATION COMPOUNDS

322322 Which one of the following complexes will exhibit the least paramagnetic behavior?

1 \({\mathrm{\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
2 \({\mathrm{\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
3 \({\mathrm{\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
4 \({\mathrm{\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

322323 Assertion :
\(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) is square planar and diamagnetic.
Reason :
It has no unpaired electrons due to presence of strong field ligand.

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.
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CHXII09:COORDINATION COMPOUNDS

322320 Read Assertion and Reason carefully and mark correct option.
Assertion :
The spin only magnetic moment value for \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\) is 1.74 B.M., whereas for \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is 5.92 B.M.
Reason :
In both complexes, Fe is present in \( + \,3\) oxidation state.

1 Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
2 Assertion is false but Reason is true.
3 Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
4 Assertion is true but Reason is false.
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

322321 Which of the following complexes is diamagnetic and square planar?

1 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
3 \(\left[\mathrm{NiCl}_{4}\right]^{2-}\)
4 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\)
MHTCET - 2021
CHXII09:COORDINATION COMPOUNDS

322322 Which one of the following complexes will exhibit the least paramagnetic behavior?

1 \({\mathrm{\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
2 \({\mathrm{\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
3 \({\mathrm{\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
4 \({\mathrm{\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}}}\)
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

322323 Assertion :
\(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) is square planar and diamagnetic.
Reason :
It has no unpaired electrons due to presence of strong field ligand.

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.
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