d-Block elements are present in which groups
A Group 1–2
B Group 13–18
C Group 3–12
D Group 17 only
These elements have partially filled d-orbitals.
d-Block elements are also called
A noble gases
B transition elements
C metalloids
D alkaline earth metals
They show gradual change in properties.
Which is NOT a characteristic of transition metals
A variable oxidation states
B coloured compounds
C high melting points
D low density like alkali metals
Transition metals generally have high density.
Variable oxidation states in transition metals are due to
A large atomic size
B availability of s and d electrons
C high electronegativity
D filled d-orbitals
Both orbitals participate in bonding.
Which transition metal shows maximum oxidation states
A iron
B copper
C manganese
D zinc
Shows oxidation states from +2 to +7.
Coloured compounds of transition metals are due to
A charge transfer
B d–d transitions
C f–f transitions
D s–p transitions
Absorption of visible light causes colour.
Which ion is colourless
A Fe²⁺
B Cu²⁺
C Zn²⁺
D Ni²⁺
d¹⁰ configuration has no d–d transitions.
Which transition metal is used as catalyst in Haber process
A copper
B iron
C nickel
D platinum
Finely divided iron catalyses ammonia synthesis.
Which metal is used in hydrogenation of oils
A iron
B copper
C nickel
D zinc
Acts as hydrogenation catalyst.
Which metal shows maximum catalytic activity
A alkali metals
B alkaline earth metals
C transition metals
D noble gases
Due to variable oxidation states and surface adsorption.
Which alloy is used for making coins
A steel
B brass
C bronze
D stainless steel
Brass is Cu–Zn alloy.
Stainless steel mainly contains
A iron, carbon
B iron, chromium, nickel
C copper, zinc
D iron, sulphur
Chromium prevents corrosion.
Which metal shows highest magnetic moment
A zinc
B copper
C iron
D silver
Presence of unpaired electrons.
Paramagnetism in transition metals is due to
A paired electrons
B unpaired electrons
C metallic bonding
D lattice energy
Magnetic moment arises from unpaired spins.
Which metal is ferromagnetic
A aluminium
B copper
C iron
D zinc
Strong magnetic ordering.
Which transition metal has completely filled d-orbitals
A copper
B iron
C zinc
D cobalt
d¹⁰ configuration.
Which metal is used for electroplating
A sodium
B magnesium
C chromium
D potassium
Provides corrosion resistance and shine.
Which metal forms coloured solutions in aqueous state
A zinc
B copper
C cadmium
D mercury
Cu²⁺ ions are blue.
f-Block elements include
A lanthanoids only
B actinoids only
C lanthanoids and actinoids
D noble gases
Involve filling of f-orbitals.
Lanthanoids belong to
A period 6
B period 7
C group 3
D group 18
4f-orbital filling series.
Actinoids belong to
A period 5
B period 6
C period 7
D group 2
5f-orbital filling.
Which lanthanoid is most abundant
A cerium
B lanthanum
C neodymium
D europium
Most abundant rare earth element.
Lanthanoids show contraction due to
A increase in nuclear charge
B poor shielding of 4f electrons
C large atomic size
D filled orbitals
Leads to lanthanoid contraction.
Lanthanoid contraction results in
A increase in atomic radius
B decrease in atomic radius
C no change
D irregular behaviour
Gradual decrease across series.
Which oxidation state is most common for lanthanoids
A +1
B +2
C +3
D +4
Loss of two s and one d/f electron.
Actinoids show greater variability in oxidation states because
A 5f electrons are deeply buried
B 5f, 6d and 7s electrons participate
C poor shielding is absent
D they are stable
Leads to multiple oxidation states.
Most actinoids are
A non-metals
B stable
C radioactive
D inert
All actinoids are radioactive.
Which element is used as nuclear fuel
A iron
B uranium
C copper
D zinc
U-235 undergoes fission.
Which actinoid is used in nuclear reactors
A thorium
B uranium
C plutonium
D all of these
Used as fuels or breeder materials.
Which element is used in control rods
A sodium
B aluminium
C boron
D calcium
Absorbs neutrons efficiently.
Which lanthanoid is used in glass polishing
A cerium
B europium
C ytterbium
D samarium
Cerium oxide is polishing agent.
Misch metal contains mainly
A iron and carbon
B lanthanoids
C alkali metals
D noble gases
Used in lighter flints.
Which element is used in making strong permanent magnets
A iron
B cobalt
C neodymium
D zinc
Nd–Fe–B magnets are very strong.
Which transition metal forms maximum number of complexes
A zinc
B iron
C copper
D silver
Multiple oxidation states and coordination numbers.
Coordination number of transition metals is generally
A 2
B 4 or 6
C 8 only
D 12
Common geometries are tetrahedral and octahedral.
Which metal is used in galvanisation of iron
A copper
B chromium
C zinc
D tin
Prevents rusting.
Rusting of iron is an example of
A reduction
B oxidation
C corrosion
D neutralisation
Electrochemical deterioration.
Which oxide is amphoteric among transition metals
A FeO
B ZnO
C CuO
D MnO
Reacts with acids and bases.
Which transition metal has highest melting point
A iron
B copper
C tungsten
D zinc
Strong metallic bonding.
Which metal is used in filament of electric bulb
A copper
B iron
C tungsten
D aluminium
Very high melting point.
Which f-block element is used in cancer therapy
A uranium
B cobalt
C iodine
D radium
Radioactive radiation used in treatment.
Which element is used in smoke detectors
A uranium
B americium
C thorium
D radium
Emits alpha particles.
Which property decreases across transition series
A atomic radius
B density
C melting point
D electronegativity
Due to increasing nuclear charge.
Which metal shows +1 oxidation state most commonly
A iron
B copper
C zinc
D nickel
Cu⁺ is common in compounds.
Which metal does not form complexes easily
A iron
B cobalt
C nickel
D zinc
d¹⁰ configuration.
Which element is used in making alloys for aircraft
A iron
B aluminium
C copper
D zinc
Light and strong.
Which metal is liquid at room temperature
A gallium
B mercury
C cesium
D bromine
Only liquid metal at room temperature.
Which transition metal is used in photography
A iron
B silver
C copper
D gold
Silver halides are photosensitive.
Which actinoid has highest atomic number
A uranium
B thorium
C plutonium
D lawrencium
Last actinoid.
Correct statement is
A Zinc is a typical transition metal
B Lanthanoids show variable oxidation states
C Actinoids are mostly radioactive
D Noble gases are f-block elements
All actinoids show radioactivity.