Test: Some Applications of d- and f-Block Elements (December 11) - NEET MCQ

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.

An aqueous solution of  [Ti(H₂O)₆]³⁺  by absorbing greenish-yellow component of white light, d-d transition takes place and the aqueous solution appears purple as the purple is the complementary colour of greenish yellow.

Alkalis have no action with actinoids metals.

The element with atomic number 100 is fermium. Its configuration is [Rn] 5f¹²6d⁰7s².

The correct answer is C
When an alkali is added to an orange red solution of dichromate it forms chromate.
For example:
K₂Cr₂O₇  + 2KOH ➡ 2K₂CrO₄  +  H₂O 

4f electrons have greater shielding effect but 5f electrons have poor shielding effect.