Integer Answer Type Questions: The d- and f-Block Elements & Coordination Compounds | JEE Advanced | 35 Years Chapter wise Previous Year Solved Papers for JEE PDF Download

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.

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. 

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. EDTA^4– 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. 

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. 

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–

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. 

SCN^– is weak field ligand hence pairing will not occur.

Unpaired electrons = 5

Magnetic moment 

CN^– is strong field ligand hence pairing will take place.

Unpaired electrons = 1

Magnetic moment 

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. 

∴ 8 moles of MnO4^– form 6 moles of 

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