Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

Class 12 Chemistry 35 Years JEE Mains &Advance Past yr Paper

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Q.1. The number of water molecule(s) directly bonded to the metal centre in CuSO4.5H2O is             (2009 - 4 Marks)

Ans. 4

Solution. The number of water molecules directly bonded to the metal centre in CuSO4.5H2O is 4.

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev


Q.2. The oxidation number of Mn in the product of alkaline oxidative fusion of MnO2 is              (2009 - 4 Marks)

Ans. 6

Solution. 2MnO2 + 4KOH + O2 →2K 2MnO4+ 2H2O

Oxidation number of Mn in K2MnO4 is 6

K2MnO4 ;  2 + x – 8 = 0

x = 6


Q.3. Total number of geometrical isomers for the complex  [RhCl(CO) (PPh3) (NH3)] is            (2010)

Ans. 3

Solution. 

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

The number of geometrical isomers is 3.

 

Q.4. The volume (in mL) of 0.1 M AgNO, required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H2O)5Cl]Cl2, as silver chloride is close to               (2011)

Ans. 6

Solution. m moles of [Cr (H2O)5Cl]Cl2 = 0.01 × 30 = 0.3
m moles of Cl–  = 0.3 × 2 = 0.6
[1 mole of complex gives 2 Cl ions]
m moles of Ag+ = m moles of Cl
0.1 × V = 0.6
V = 6 mL


Q.5. EDTA4– is eth ylen ediaminetetraacetate ion . Th e total number of N—Co—O bond angles in [Co(EDTA)]1– complex ion is              (JEE Adv. 2013)

Ans. 8

Solution. 

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

Total no. of N – Co – O bonds are 8.


Q.6. Consider the following list of reagents: (JEE Adv. 2014) 

Acidified K2Cr2O7, alkaline KMnO4, CuSO4, H2O2, Cl2, O3, FeCl3, HNO3 and Na2S2O3.

The total number of reagents that can oxidise aqueous iodide to iodine is

Ans. 7

Solution. K2Cr2O7 + KI + H2SO4 → K2SO4 + Cr2(SO4)3 + I2 + H2O

2CuSO4 + KI → 2CuI + I2 + 2K2SO4

H2O2 + 2KI → 2KOH + I2

Cl2 + 2KI → 2KCl + I2

O3 + H2O + 2KI → 2KOH + O2 + I2
FeCl3 + 2KI → 2KCl + FeCl2 + I2
HNO3 + KI → KNO3 + I2 + NO


Q.7. In the complex acetylbromidodicarbonylb is (triethylphosphine) iron (II), the number of Fe–C bond(s) is            (JEE Adv. 2015)

Ans. 3

Solution. 

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev


Q.8. Among the complex ions, [Co(NH2–CH2–CH2–NH2)2Cl2]+, [CrCl2(C2O4)2]3–, [Fe(H2O)4(OH)2]+, [Fe(NH3)2(CN)4], [Co(NH2–CH2–CH2–NH2)2(NH3)Cl]2+ and [Co(NH3)4(H2O)Cl]2+, the number of complex ion(s) that show(s) cis-trans isomerism is                  (JEE Adv. 2015)

Ans. 6

Solution. All the complexes given show cis-trans isomerism

[Co (NH2 — CH2 — CH2 — NH2)2Cl2]+ [CrCl2(C2O4)2]3–

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev
Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev
Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev


Q.9. For the octahedral complexes of Fe3+ in SCN (thiocyanatoS) and in CN ligand environments, the difference between the spin-only magnetic moments in Bohr magnetons (when approximated to the nearest integer) is 

[Atomic number of Fe = 26]                      (JEE Adv. 2015)

Ans. 4

Solution. 

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

SCN is weak field ligand hence pairing will not occur.

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

Unpaired electrons = 5

Magnetic moment  Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev
Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

CN is strong field ligand hence pairing will take place.

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

Unpaired electrons = 1

Magnetic moment  Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

Difference = 5.92 – 1.732 = 4.188
Hence answer is (4).


Q.10. In neutral or faintly alkaline solution, 8 moles of permanganate anion quantitatively oxidize thiosulphate anions to produce X moles of a sulphur containing product. The magnitude of X is                     (JEE Adv. 2016)

Ans. 6

Solution. Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRevInteger Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

∴ 8 moles of MnO4 form 6 moles of  Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev


Q.11. The number of geometric isomers possible for the complex [CoL2Cl2] (L = H2NCH2CH2O) is                    (JEE Adv. 2016)

Ans. 5

Solution. [CoL2Cl2]   (L = H2NCH2CH2O)

L is unsymmetrical didentate ligand.

So the complete is equivalent to [M(AB)2a2] Possible G..I. are

Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev
Integer Value of The d- and f-Block Elements & Coordination Compounds, Past year Ques, JEE Adv. JEE Notes | EduRev

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