Test: Position of d & f Block Elements & applications(18 Jan) - JEE MCQ

Co⁺² = [Ar] 3d⁷
Cu²⁺ = [Ar] 3d⁹
Mn⁺² = [Ar] 3d⁵
Sc⁺³ = [Ar]
We can see that only Sc⁺³  has no unpaired electron, so it is a diamagnetic ion.

The inner transition elements are the elements in which the added electrons go to (n-2) f-orbitals. These include lanthanoids and actinoids. In lanthanoids, the added electron goes to 4f orbital and in actinoids, the added electron goes to 5f orbital.

The second series includes the elements yttrium (symbol Y, atomic number 39) to cadmium(symbol Cd, atomic number 48). 

ilver in the form of Ag⁺ is colourless. For transition metal ions to exhibit color, their metal ions must have incompletely filled (n-1)d orbitals.

Ag⁺ =4d¹⁰,5s⁰

Ag⁺ has completely filled d orbitals hence is colourless.

Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties.It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.
Brass is similar to bronze, another alloy containing copper that uses tin in place of zinc; both bronze and brass may include small proportions of a range of other elements including arsenic, lead, phosphorus, aluminum, manganese, and silicon.

Americium (2 = 95) and curium (Cm, Z = 96) have [Rn] 5f⁷6d⁰7s² and [Rn] 5f⁷6d¹7s² configuration, respectively.

Uranium is used in the production of nuclear energy by the process of nuclear fission.
Plutonium is fissionable material and is used for fueling atomic reactors.

The correct answer is Option C
Only d orbitals accept the lone pair of electrons during complex formation. Their absence means that the atom will not be able to accept the lone pair of electrons and the complex will not be formed.

Actinoids are radioactive elements and uranium is the heaviest natural element.

ilver in the form of Ag⁺ is colourless. For transition metal ions to exhibit color, their metal ions must have incompletely filled (n-1)d orbitals.

Ag⁺ =4d¹⁰,5s⁰

Ag⁺ has completely filled d orbitals hence is colourless.