D and F Block Elements MCQs

The d-block elements consist of 40 elements arranged in four rows of ten columns. All d-block elements are metallic, so the term “d-block metals” is often used interchangeably. These elements are commonly known as transition metals. The elements in the fourth row of the d-block are synthetic and radioactive. Additionally, the lanthanides and actinides, which are positioned below the main body of the periodic table, are referred to as f-block elements. These f-block elements are also called inner transition elements.

The number of unpaired electrons in the gaseous species of Mn³⁺, Cr³⁺, and V³⁺ respectively are:

(a) 4, 4 and 2
(b) 3, 3 and 2
(c) 4, 3 and 2
(d) 3, 3 and 3

Which one of the following elements shows the maximum number of different oxidation states in its compounds?

(a) Eu
(b) La
(c) Cd
(d) Am

Zinc and mercury do not show variable valency like d-block elements because:

(a) They are soft
(b) Their d-shells are complete
(c) They have only two electrons in the outermost subshell
(d) Their d-shells are incomplete

Gun metal is an alloy of:

(a) Cu and Al
(b) Cu and Sn
(c) Cu, Zn and Sn
(d) Cu, Zn and Ni

When potassium ferrocyanide crystals are heated with concentrated sulfuric acid, the gas evolved is:

(a) Sulfur dioxide
(b) Ammonia
(c) Carbon monoxide
(d) Carbon dioxide

Silver nitrate produces a black stain on the skin due to:

(a) Being a strong reducing agent
(b) Its corrosive action
(c) Formation of a complex compound
(d) Its reduction to metallic silver

According to IUPAC nomenclature, sodium nitroprusside dihydrate is named as:

(a) Sodium pentacyanonitrosylferrate (III)
(b) Sodium nitroferrocyanide
(c) Sodium nitroferricyanide
(d) Sodium pentacyanonitrosylferrate (II)

The pair that has similar atomic radii is:

(a) Mn and Re
(b) Ti and Hf
(c) Sc and Ni
(d) Mo and W

In Fe(CO)₅, the Fe-C bond possesses:

(a) Ionic character
(b) Sigma character only
(c) Pi character
(d) Both sigma and pi characters

Which of the following products are obtained when Na₂CO₃ is added to a solution of copper sulfate?

(a) Basic copper carbonate, sodium sulfate, and CO₂
(b) Copper hydroxide, sodium sulfate, and CO₂
(c) Copper carbonate, sodium sulfate, and CO₂
(d) Copper carbonate and sodium sulfate