Free Electronic Structure of d-Block Elements MCQs with Answers

• A. Pd
• B. Cu
• C. Cd
• D. Hg

Explanation: Copper, silver and gold form group IB and are called the coinage metals because their unreactivity and durability made them the…

• A. Alkali metals
• B. Halogens
• C. Alkaline earth metals
• D. Transition metals

Explanation: Copper, silver and gold are coinage metals, and they belong to the d-block transition-metal group.

• A. Cu+2
• B. Cu+4
• C. Cu+1
• D. Cu+3

Explanation: Copper has the configuration [Ar] 3d10 4s1, so Cu+ loses the 4s electron and becomes [Ar] 3d10.

• A. 97 to 104
• B. 101 to 115
• C. 89 to 103
• D. 36 to 43

Explanation: The actinide series is conventionally given as elements with atomic numbers 89 through 103, from actinium to lawrencium.

• A. Inner Transition
• B. Outer Transition
• C. Alkali Metals
• D. Both B & C

Explanation: d-block elements are called outer transition elements because the differentiating electron enters the penultimate, or (n-1)d, subshell.

• A. 97 to 104
• B. 101 to 115
• C. 89 to 103
• D. 36 to 43

Explanation: The actinide series runs from actinium, atomic number 89, through lawrencium, atomic number 103. Thus the range is 89 to 103 inclusive.

• A. S-block
• B. P-block
• C. d-block
• D. f-block

Explanation: Cerium, Ce, atomic number 58, is a lanthanide, and lanthanides belong to the f-block because the 4f subshell is being filled across the…

• A. CaO+ SiO2--> CaSiO3
• B. 2FeS+3O2---> 2Fe+ SO2
• C. FeSiO3---> FeSiO3
• D. Fe2O3+ 3CO---> 2Fe+ 3CO2

Explanation: In the blast furnace, carbon monoxide reduces iron(III) oxide to iron: Fe2O3 + 3CO -> 2Fe + 3CO2.

• A. Iron
• B. Sodium
• C. Silver
• D. Zinc

Explanation: Parkes' process extracts silver from lead by adding zinc to molten lead; silver dissolves preferentially in zinc and is then separated.

• A. MnO2
• B. Mn2O3
• C. Mn2O7
• D. MnO

Explanation: Manganese dioxide, MnO2, is amphoteric because it can react with both acids and strong bases.

• A. Copper
• B. Aluminum
• C. Lead
• D. Tungsten

Explanation: Tungsten is used for bulb filaments because it has a very high melting point and can glow at high temperature without melting rapidly.

• A. They form complexes
• B. They show variable valency
• C. All transition metal compounds are paramagnetic
• D. They form coloured ions

Explanation: Transition metals commonly form complexes, show variable oxidation states, and produce coloured ions because their d orbitals can…

• A. Small sized metal ions
• B. Absorption of light in UV region
• C. Complete ns sub-shell
• D. Incomplete (n-1) d sub-shell

Explanation: In many transition-metal ions, an incomplete (n-1)d subshell allows electrons to absorb visible light and move between split d energy…

• A. +2
• B. +4
• C. +5
• D. +7

Explanation: The maximum oxidation state of manganese is +7, as in permanganate, MnO4−.

• A. AgF
• B. AgCl
• C. AgBr
• D. AgI

Explanation: Silver fluoride is soluble in water, whereas AgCl, AgBr and AgI are sparingly soluble because their lattice energies and solubility…

• A. Variable oxidation state
• B. Natural Radioactivity
• C. Tendency to form complexes
• D. Formation of alloys

Explanation: Transition elements generally show variable oxidation states, form complexes, and readily form alloys because their metallic atoms have…

• A. Fe
• B. Co
• C. Ni
• D. Rn

Explanation: Radioactive cobalt-60 is used in radiotherapy because its gamma radiation can damage and destroy cancer cells.

• A. N2
• B. O2
• C. N2 and O2
• D. Ne

Explanation: Magnesium does not burn in neon because neon is chemically inert and does not support combustion.

• A. Cu Hg Au
• B. Cu Ag Au
• C. Ag Au Hg
• D. Cu Fe Au

Explanation: The coinage metals are copper, silver, and gold, written as Cu, Ag, and Au; they are Group 11 metals traditionally used in coinage.

• A. oxides
• B. silicates
• C. slag
• D. carbonates

Explanation: During wrought-iron production, impurities such as magnesium, silicon and phosphorus are oxidised and combine with flux to form a molten…