274235
Assertion: Ethylenediaminetetraacetate ion forms an octahedral complex with the metal ion. Reason: It has six donor atoms which coordinate simultaneously to the metal ion.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(A) : $\left[\mathrm{M}(\mathrm{en})\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{4}\right]^{-}$complex has coordination number 6 because it has 6 donor site ( 4 from four $\mathrm{CH}_{3} \mathrm{COO}^{-}$and 2 from one ethylene diamine (en) because en act as bidentate ligand) if complex having coordination number 6 then it forms octahedral complex. Hence both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
AIIMS-2014
COORDINATION COMPOUNDS
274236
Assertion : A chelating ligand must possess two or more lone pairs at such a distance that it may form suitable strain free rings at the metal ion. Reason: $\mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}$ is a chelating ligand.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(C) : A chelating lig and must possess twe or more lone pairs which donate to metal and form 5 or 6 mempered ring generally. Example of chelating ligand is EDTA ${ }^{4-}$, acac etc $\mathrm{H}_{2} \mathrm{~N}$ $\mathrm{NH}_{2}$ is not a chelating lig and because it from 3 membered \& train ring with metal ion which is unstable. Hence, Assertion is correct but reason is incorrect.
AIIMS-2010
COORDINATION COMPOUNDS
274237
Assertion : $\left[\mathrm{FeF}_{6}\right]^{3-}$ is a low spin complex. Reason: Low spin complexes have lesser number of unpaired electrons.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(D) : In $\left[\mathrm{FeF}_{6}\right]^{3-}$ Complex, oxidation of iron is +3 $\mathrm{F}^{-}$is a weak field ligand which not do pairing of metal d - electrons. Therefore, $\left[\mathrm{FeF}_{6}\right]^{3-}$ act as high spin complex. In low spin complex pairing of metal $\mathrm{d}$ - orbital occurs. Hence, both Assertion and Reason is incorrect.
AIIMS-2013]
COORDINATION COMPOUNDS
274248
$\mathrm{CuSO}_{4}$ when reacts with $\mathrm{KCN}$ forms $\mathrm{CuCN}$ which is insoluble in water. It is soluble in excess of KCN due to the formation of the following complex
274235
Assertion: Ethylenediaminetetraacetate ion forms an octahedral complex with the metal ion. Reason: It has six donor atoms which coordinate simultaneously to the metal ion.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(A) : $\left[\mathrm{M}(\mathrm{en})\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{4}\right]^{-}$complex has coordination number 6 because it has 6 donor site ( 4 from four $\mathrm{CH}_{3} \mathrm{COO}^{-}$and 2 from one ethylene diamine (en) because en act as bidentate ligand) if complex having coordination number 6 then it forms octahedral complex. Hence both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
AIIMS-2014
COORDINATION COMPOUNDS
274236
Assertion : A chelating ligand must possess two or more lone pairs at such a distance that it may form suitable strain free rings at the metal ion. Reason: $\mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}$ is a chelating ligand.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(C) : A chelating lig and must possess twe or more lone pairs which donate to metal and form 5 or 6 mempered ring generally. Example of chelating ligand is EDTA ${ }^{4-}$, acac etc $\mathrm{H}_{2} \mathrm{~N}$ $\mathrm{NH}_{2}$ is not a chelating lig and because it from 3 membered \& train ring with metal ion which is unstable. Hence, Assertion is correct but reason is incorrect.
AIIMS-2010
COORDINATION COMPOUNDS
274237
Assertion : $\left[\mathrm{FeF}_{6}\right]^{3-}$ is a low spin complex. Reason: Low spin complexes have lesser number of unpaired electrons.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(D) : In $\left[\mathrm{FeF}_{6}\right]^{3-}$ Complex, oxidation of iron is +3 $\mathrm{F}^{-}$is a weak field ligand which not do pairing of metal d - electrons. Therefore, $\left[\mathrm{FeF}_{6}\right]^{3-}$ act as high spin complex. In low spin complex pairing of metal $\mathrm{d}$ - orbital occurs. Hence, both Assertion and Reason is incorrect.
AIIMS-2013]
COORDINATION COMPOUNDS
274248
$\mathrm{CuSO}_{4}$ when reacts with $\mathrm{KCN}$ forms $\mathrm{CuCN}$ which is insoluble in water. It is soluble in excess of KCN due to the formation of the following complex
274235
Assertion: Ethylenediaminetetraacetate ion forms an octahedral complex with the metal ion. Reason: It has six donor atoms which coordinate simultaneously to the metal ion.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(A) : $\left[\mathrm{M}(\mathrm{en})\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{4}\right]^{-}$complex has coordination number 6 because it has 6 donor site ( 4 from four $\mathrm{CH}_{3} \mathrm{COO}^{-}$and 2 from one ethylene diamine (en) because en act as bidentate ligand) if complex having coordination number 6 then it forms octahedral complex. Hence both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
AIIMS-2014
COORDINATION COMPOUNDS
274236
Assertion : A chelating ligand must possess two or more lone pairs at such a distance that it may form suitable strain free rings at the metal ion. Reason: $\mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}$ is a chelating ligand.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(C) : A chelating lig and must possess twe or more lone pairs which donate to metal and form 5 or 6 mempered ring generally. Example of chelating ligand is EDTA ${ }^{4-}$, acac etc $\mathrm{H}_{2} \mathrm{~N}$ $\mathrm{NH}_{2}$ is not a chelating lig and because it from 3 membered \& train ring with metal ion which is unstable. Hence, Assertion is correct but reason is incorrect.
AIIMS-2010
COORDINATION COMPOUNDS
274237
Assertion : $\left[\mathrm{FeF}_{6}\right]^{3-}$ is a low spin complex. Reason: Low spin complexes have lesser number of unpaired electrons.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(D) : In $\left[\mathrm{FeF}_{6}\right]^{3-}$ Complex, oxidation of iron is +3 $\mathrm{F}^{-}$is a weak field ligand which not do pairing of metal d - electrons. Therefore, $\left[\mathrm{FeF}_{6}\right]^{3-}$ act as high spin complex. In low spin complex pairing of metal $\mathrm{d}$ - orbital occurs. Hence, both Assertion and Reason is incorrect.
AIIMS-2013]
COORDINATION COMPOUNDS
274248
$\mathrm{CuSO}_{4}$ when reacts with $\mathrm{KCN}$ forms $\mathrm{CuCN}$ which is insoluble in water. It is soluble in excess of KCN due to the formation of the following complex
274235
Assertion: Ethylenediaminetetraacetate ion forms an octahedral complex with the metal ion. Reason: It has six donor atoms which coordinate simultaneously to the metal ion.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(A) : $\left[\mathrm{M}(\mathrm{en})\left(\mathrm{CH}_{3} \mathrm{COO}\right)_{4}\right]^{-}$complex has coordination number 6 because it has 6 donor site ( 4 from four $\mathrm{CH}_{3} \mathrm{COO}^{-}$and 2 from one ethylene diamine (en) because en act as bidentate ligand) if complex having coordination number 6 then it forms octahedral complex. Hence both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
AIIMS-2014
COORDINATION COMPOUNDS
274236
Assertion : A chelating ligand must possess two or more lone pairs at such a distance that it may form suitable strain free rings at the metal ion. Reason: $\mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}$ is a chelating ligand.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(C) : A chelating lig and must possess twe or more lone pairs which donate to metal and form 5 or 6 mempered ring generally. Example of chelating ligand is EDTA ${ }^{4-}$, acac etc $\mathrm{H}_{2} \mathrm{~N}$ $\mathrm{NH}_{2}$ is not a chelating lig and because it from 3 membered \& train ring with metal ion which is unstable. Hence, Assertion is correct but reason is incorrect.
AIIMS-2010
COORDINATION COMPOUNDS
274237
Assertion : $\left[\mathrm{FeF}_{6}\right]^{3-}$ is a low spin complex. Reason: Low spin complexes have lesser number of unpaired electrons.
1 If both Assertion and Reason are correct and the Reason is the correct explanation of Assertion.
2 If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
3 If Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
Explanation:
(D) : In $\left[\mathrm{FeF}_{6}\right]^{3-}$ Complex, oxidation of iron is +3 $\mathrm{F}^{-}$is a weak field ligand which not do pairing of metal d - electrons. Therefore, $\left[\mathrm{FeF}_{6}\right]^{3-}$ act as high spin complex. In low spin complex pairing of metal $\mathrm{d}$ - orbital occurs. Hence, both Assertion and Reason is incorrect.
AIIMS-2013]
COORDINATION COMPOUNDS
274248
$\mathrm{CuSO}_{4}$ when reacts with $\mathrm{KCN}$ forms $\mathrm{CuCN}$ which is insoluble in water. It is soluble in excess of KCN due to the formation of the following complex
