JEE Advanced (Fill in the Blanks): The d & f-Block Elements & Coordination Compounds

Q.1. AgCN dissolves in excess KCN solution to give the complex compound ...........                    (1980)

Ans. K[Ag(CN)₂]

Solution. K[Ag(CN)₂]

Q.2. Mn²⁺ can be oxidised to Mn O^-₄ by .................     (1981 - 1 Mark)

(SnO₂, PbO₂, BaO₂)

Ans. PbO₂

Solution. PbO₂;

Q.3.  Galvanization of iron denotes coating with ...............     (1983 - 1 Mark)

Ans. zinc

Solution. Zinc;

Q.4. Silver chloride is sparingly soluble in water because its lattice energy is greater than .............. energy.    (1987 - 1 Mark)

Ans. hydration/solvation

Solution. Hydration/solvation; [A substance dissolves when its Δ_Hhydration > lattice energy]

Q.5. The salts ............... and ............... are isostructural.      (1988 - 1 Mark)

(FeSO₄.7H₂O, CuSO₄.5H₂O, MnSO₄.4H₂O, ZnSO₄.7H₂O)

Ans. FeSO₄.7H₂O, ZnSO₄.7H₂O

Solution. FeSO₄.7H₂O, ZnSO₄.7H₂O ;

Q.6. The type of magnetism exhibited by [Mn(H₂O)₆]²⁺ ion is .............

Ans. Paramagnetism; [Mn(H₂O)₆]²⁺ shows paramagnetism because of presence of 5 unpaired electrons in the outer most orbital (3d⁵) of Mn²⁺.

Q.7. The IUPAC name of [Co(NH₃)₆] Cl₃ is .............               (1994 - 1 Mark)

Ans. paramagnetism

Solution. Hexammine cobalt (III) chloride

Q.8. When Fe(s) is dissolved in aqueous hydrochloric acid in a closed vessel, the work done is ...........    (1997 - 1 Mark).

Ans. zero

Solution. zero

Q.9. Silver jewellery items tarnish slowly in the air due to their reaction with ............... .

Ans. H₂S

Solution. H₂S; It is due to formation of sulphide of silver (Ag,S) which is black.