a) They have completely filled d-orbitals.
b) They form only ionic compounds.
c) They are good conductors of electricity.
d) They have similar properties to the s-block elements.
Answer: c) They are good conductors of electricity.
Explanation: d-block elements are good conductors of
electricity due to the presence of free electrons in their d-orbitals.
a) Mn
b) Fe
c) Cr
d) Cu
Answer: a) Mn
Explanation: Manganese exhibits the highest oxidation state of
+7 in compounds such as potassium permanganate (KMnO₄).
a) Formation of colored compounds
b) Formation of complex compounds
c) High melting and boiling points
d) High electronegativity
Answer: d) High electronegativity
Explanation: Transition elements have low electronegativity
compared to s-block elements.
a) Nickel
b) Cobalt
c) Copper
d) Iron
Answer: a) Nickel
Explanation: [Ni(CO)₄] is a nickel carbonyl complex where
nickel is in the zero oxidation state.
a) NaCl
b) Fe₄C
c) AgNO₃
d) CuSO₄
Answer: b) Fe₄C
Explanation: Fe₄C is an interstitial compound where small
carbon atoms occupy the interstitial spaces in the iron lattice.
a) Charge transfer transition
b) d-d transition
c) Excitation of electrons in the s-orbital
d) Ligand to metal charge transfer
Answer: b) d-d transition
Explanation: The blue color of [Cu(H₂O)₆]²⁺ is due to d-d
transition of electrons in the d-orbitals of Cu²⁺.
a) +2
b) +3
c) +6
d) +7
Answer: d) +7
Explanation: Manganese exhibits the highest oxidation state of
+7 in KMnO₄.
a) Manganese
b) Chromium
c) Iron
d) Copper
Answer: a) Manganese
Explanation: Manganese can exhibit oxidation states from +2 to
+7, making it the element with the maximum number of oxidation states.
a) Fe
b) Cu
c) Cr
d) Mn
Answer: b) Cu
Explanation: Copper most commonly exists in the +2 oxidation
state as Cu²⁺ in compounds like copper sulfate (CuSO₄).
a) Mn²⁺
b) Fe²⁺
c) Co²⁺
d) Cu²⁺
Answer: d) Cu²⁺
Explanation: Cu²⁺ has a stable electronic configuration of [Ar]
3d⁹, which is relatively stable due to the pairing of electrons in the
d-orbital.
a) They show only one oxidation state.
b) They are all radioactive.
c) They are found in nature in their pure form.
d) They are all f-block elements.
Answer: d) They are all f-block elements.
Explanation: The lanthanides are f-block elements characterized
by filling of the 4f orbitals.
a) [Ar] 3d⁶
b) [Ar] 3d⁵
c) [Ar] 3d⁸
d) [Ar] 4s⁰ 3d⁶
Answer: a) [Ar] 3d⁶
Explanation: In the +3 oxidation state, a transition metal
typically loses three electrons, resulting in the electronic configuration [Ar]
3d⁶.
a) Chromium
b) Cobalt
c) Copper
d) Iron
Answer: b) Cobalt
Explanation: Cobalt is widely used in the preparation of
magnets due to its magnetic properties.
a) Oxides
b) Peroxides
c) Superoxides
d) All of the above
Answer: d) All of the above
Explanation: Transition metals can form oxides, peroxides, or
superoxides depending on their oxidation state and the nature of the compound.
a) Iron
b) Copper
c) Chromium
d) Manganese
Answer: b) Copper
Explanation: Copper easily forms the +2 oxidation state due to
its stable d⁹ electronic configuration.
a) K₂CrO₄
b) K₂Cr₂O₇
c) KCrO₄
d) KCr₂O₇
Answer: b) K₂Cr₂O₇
Explanation: Potassium dichromate has the formula K₂Cr₂O₇,
where chromium is in the +6 oxidation state.
a) Manganese
b) Chromium
c) Cobalt
d) Iron
Answer: b) Chromium
Explanation: Chromium is a key component in stainless steel,
providing resistance to corrosion.
a) Platinum
b) Iron
c) Copper
d) Nickel
Answer: a) Platinum
Explanation: Platinum is widely used in catalytic converters to
reduce harmful emissions in vehicles.
a) Charge transfer transitions
b) d-d transition
c) Ligand to metal charge transfer
d) Excitation of electrons in the s-orbital
Answer: a) Charge transfer transitions
Explanation: The purple color of KMnO₄ is due to charge
transfer transitions from the oxygen to the manganese atom.
a) +3
b) +2
c) +6
d) +5
Answer: b) +2
Explanation: Iron commonly exhibits +2 oxidation state in
compounds such as FeSO₄.
a) It leads to an increase in atomic size.
b) It leads to a decrease in ionization enthalpy.
c) It leads to a decrease in atomic size.
d) It leads to an increase in the electronegativity of lanthanides.
Answer: c) It leads to a decrease in atomic size.
Explanation: The lanthanide contraction refers to the gradual
decrease in atomic and ionic sizes from La to Lu due to poor shielding by the
f-electrons.
a) Cr₂O₃
b) Fe₂O₃
c) MnO₂
d) NiO
Answer: a) Cr₂O₃
Explanation: Cr₂O₃ is amphoteric and reacts with both acids and
bases.
a) +1
b) +2
c) +3
d) +4
Answer: b) +2
Explanation: Copper most commonly exists in the +2 oxidation
state as Cu²⁺.
a) Cerium
b) Neodymium
c) Samarium
d) Yttrium
Answer: d) Yttrium
Explanation: Yttrium is used in the preparation of
high-temperature superconductors.
a) [Ar] 3d⁶
b) [Ar] 3d⁵
c) [Ar] 3d⁴
d) [Ar] 3d⁸
Answer: b) [Ar] 3d⁵
Explanation: Cr³⁺ has the electronic configuration [Ar] 3d⁵, as
it loses three electrons.
a) Formation of colored complexes
b) High melting and boiling points
c) Ability to form complex compounds
d) High electronegativity
Answer: d) High electronegativity
Explanation: Transition metals have lower electronegativity
compared to other non-metals.
a) Silver
b) Gold
c) Platinum
d) Lead
Answer: c) Platinum
Explanation: Platinum is used as a catalyst in several
industrial processes, such as catalytic converters in automobiles.
a) Mn²⁺
b) Fe²⁺
c) Cr²⁺
d) Co²⁺
Answer: a) Mn²⁺
Explanation: Mn²⁺ has the electronic configuration 3d⁵ 4s² and
loses two electrons to attain a d⁴ configuration.
a) Calcium
b) Silicon
c) Manganese
d) Oxygen
Answer: c) Manganese
Explanation: Manganese is a transition metal, whereas calcium,
silicon, and oxygen are not.
a) They have only one oxidation state.
b) They form only ionic bonds.
c) They form colored compounds.
d) They are non-metals.
Answer: c) They form colored compounds.
Explanation: D-block elements often form colored compounds due
to electronic transitions within their d-orbitals.
a) CrO₃
b) Cr₂O₃
c) CrO₄
d) CrO₂
Answer: a) CrO₃
Explanation: Chromium trioxide has the formula CrO₃, commonly
used as an oxidizing agent.
a) Chromium
b) Manganese
c) Iron
d) Copper
Answer: b) Manganese
Explanation: Manganese frequently forms the +3 oxidation state
in its compounds.
a) They are generally diamagnetic.
b) They are generally paramagnetic.
c) They are generally ferromagnetic.
d) They are generally anti-magnetic.
Answer: b) They are generally paramagnetic.
Explanation: Due to the presence of unpaired electrons,
transition metals are generally paramagnetic.
a) Fe³⁺
b) Mn²⁺
c) Co²⁺
d) Ni²⁺
Answer: d) Ni²⁺
Explanation: Ni²⁺ has the electronic configuration 3d⁸, but
upon ionization it gives a 3d⁷ configuration.
a) They form only ionic compounds.
b) They have very high melting points.
c) They are typically soft and ductile.
d) They have a large number of oxidation states.
Answer: b) They have very high melting points.
Explanation: F-block elements, especially the lanthanides, have
high melting points due to the strong metallic bonds in their structures.
a) Neodymium
b) Scandium
c) Thulium
d) Europium
Answer: a) Neodymium
Explanation: Neodymium is used to prepare high-strength magnets
used in various technological applications.
a) Iron
b) Chromium
c) Manganese
d) Copper
Answer: c) Manganese
Explanation: Manganese shows the highest oxidation state of +7
in KMnO₄.
a) It is highly reactive with oxygen.
b) It shows only one oxidation state, +1.
c) It is a poor conductor of electricity.
d) It is used extensively in electrical wiring.
Answer: d) It is used extensively in electrical wiring.
Explanation: Copper is widely used in electrical wiring due to
its excellent conductivity.
a) Transition elements
b) Noble gases
c) Halogens
d) Alkali metals
Answer: a) Transition elements
Explanation: d-block elements are called transition elements
because they lie between s-block and p-block elements.
a) Iron
b) Chromium
c) Manganese
d) Aluminum
Answer: d) Aluminum
Explanation: Aluminum always shows the +3 oxidation state in
its compounds.
a) Chromium
b) Manganese
c) Copper
d) Zinc
Answer: b) Manganese
Explanation: Manganese can show oxidation states from +2 to +7,
the maximum for any element in the d-block.
a) NaCl
b) [Cu(NH₃)₄]²⁺
c) Fe₂O₃
d) Na₂SO₄
Answer: b) [Cu(NH₃)₄]²⁺
Explanation: [Cu(NH₃)₄]²⁺ is a complex ion formed by copper,
demonstrating the typical behavior of transition metals in forming complex
compounds.
a) Fe²⁺
b) Cr³⁺
c) Mn²⁺
d) Co²⁺
Answer: b) Cr³⁺
Explanation: Cr³⁺ has the electronic configuration of [Ar],
making it isoelectronic with argon.
a) [Ar] 3d⁵ 4s²
b) [Ar] 3d⁴ 4s²
c) [Ar] 3d⁶ 4s²
d) [Ne] 3s² 3p⁶ 3d⁵ 4s¹
Answer: a) [Ar] 3d⁵ 4s²
Explanation: The electronic configuration of Mn is [Ar] 3d⁵
4s².
a) Sodium
b) Copper
c) Calcium
d) Magnesium
Answer: b) Copper
Explanation: Copper forms various colored complexes, such as
[Cu(H₂O)₆]²⁺.
a) Ability to form complex compounds
b) Formation of colored compounds
c) High electronegativity
d) Ability to form multiple oxidation states
Answer: c) High electronegativity
Explanation: Transition metals have lower electronegativity
than non-metals.
a) Sodium hydroxide
b) Sodium chloride
c) Potassium hydroxide
d) Iron oxide
Answer: a) Sodium hydroxide
Explanation: Sodium hydroxide is used in the Bayer process to
extract aluminum from bauxite.
a) K₂Cr₂O₇
b) FeCl₃
c) CuSO₄
d) ZnCl₂
Answer: a) K₂Cr₂O₇
Explanation: In potassium dichromate (K₂Cr₂O₇), chromium has an
oxidation state of +6, which is the highest oxidation state of chromium.
a) They have a low melting point
b) They are typically highly reactive
c) They form highly stable and reactive oxides
d) They exhibit high electrical conductivity
Answer: d) They exhibit high electrical conductivity
Explanation: Transition metals are good conductors of
electricity due to the presence of free electrons in their d-orbitals.
a) Ni
b) Pt
c) Pd
d) Ag
Answer: a) Ni
Explanation: Nickel (Ni) is commonly used as a catalyst in the
hydrogenation of vegetable oils.