Iron is the most abundant transition metal.

Copper is the best reducing agent among 3d series transition elements.

Zr and Hf have the same atomic size.

Ti⁴⁺ is colourless.

Osmium is the densest transition element.

NH₄⁺ and SF₄

AlCl₃ and PCl₃

SF₆ and XeF₆

CH₄ and SO₄^2-

BH₃ and NH₃

Covalent character: MI > MBr > MCl > MF

Stability of +1 oxidation state: In < Ga < Al < Tl

Most stable form of phosphorus: White phosphorus

Ionic size: S^2- > Cl^- > K⁺ > Ca²⁺

Acidic strength: HClO > HIO > HBrO

Larger number of oxidation states is exhibited by actinides than those by lanthanides.

4f and 5f orbitals are equally shielded.

There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.

Lanthanum has partially filled d orbitals and no other partially filled orbital.

Lutetium is the densest lanthanide.

Malachite : Copper

Calaverite : Gold

Magnetite : Iron

Karnalite : Potassium

Galena : Tin

Lanthanum has smaller atomic radius than lutetium.

Fluorides of lanthanides are water soluble.

La³⁺ ions will exhibit colour in aqueous solutions.

Lu³⁺ is diamagnetic.

La(OH)₃ is less basic than Lu(OH)₃.

Bond length: HF < HCl < HBr < HI

Bond dissociation energy: HF > HCl > HBr > HI

Reducing power: HF < HCl < HBr < HI

Boiling point: HF < HCl < HBr < HI

Acidic strength: HF < HC < HBr < HI

BeF₂, CO₂, N₂O

N₂O, NO₂, CO₂

BF₃, CO₂, N₂O

NO₂, BeF₂, N₂O

H₂S, BeF₂, CO₂

Mn²⁺ and Fe²⁺

Sc³⁺ and Fe³⁺

Mn²⁺ and Ni³⁺

Cr³⁺ and Fe³⁺

Mn²⁺ and Fe³⁺

Li⁺ ion is more solvated than Na⁺ ion in water.

MgCl₂ is more covalent than BeCl₂.

MgO is less basic than Al₂O₃.

Mg has higher atomic radius than Ca.

Beryllium exhibits coordination number six.

ClF₃, IF₇

CN^‑, N^3-

(CN)₂, (SCN)₂

ClF₃, CN^‑

ICl, N^3-

Ethylene diaminetetraacetate ion: Hexadentate ligand

Chemotherapy of cancer: cis-[Pt^II (NH₃)₂ Cl₂]

Cyanate ion: Ambidentate ligand

Nitrite ion: Bidentate ligand

Pentaamminechloridocobalt(III) sulphate: [Co(NH₃)₅Cl]SO₄

NiF₆^2-

[Cr(CN)₆]^3-

MnO₄^-

CrO₂Cl₂

[Fe(CN)₆]^4-

Lead pencil contains lead sulphide.

Red form of lead oxide is called litharge.

PbO₂ is acidic in nature.

All the elements of group 14 form monoxides.

Pb₃O₄ is called lead sesquioxide.

principal quantum number

type of electron

nuclear charge

type of bonding in crystal lattice

principal quantum number

Because of its smaller size

Because of more penetrating power of p orbitals

Because of its nuclear force of attraction on electrons

Because half-filled orbitals are more stable

Because the last electron in phosphorus has a higher value of principle quantum number

Mg²⁺, S^2-, F^-, Na⁺

Ca²⁺, O^2-, Cl^-, K⁺

Mg²⁺, O^2-, F^-, K⁺

Ca²⁺, S^2-, Cl^-, K⁺

Mg²⁺, S^2-, Cl^-, Na⁺

Only (a) and (b)

Only (b) and (c)

Only (a) and (c)

(a), (b) and (c)

Only (a)

A(g) → A⁺(g) + e^-

1/2 A₂(g) → A(g)

A(s) → A(g)

A⁺(g) + B^-(g) → A⁺B^-(s)

A⁺B^-(s) → A⁺ (g) + B^-(g)

[Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄]Br

[Co(NH₃)₆][Cr(CN)₆] and [Cr(NH₃)6][Co(CN)₆]

[Cr(H₂O)₄Cl₂]Cl·2H₂O and [Cr(H₂O)₅Cl]Cl₂·H₂O

[Pt(NH₃)₄][PtCl₆] and [Pt(NH₃)4Cl₂][PtCl₄]

[Co(NH₃)₅(NO₂)]²⁺ and [Co(NH₃)₅(ONO₂)]²⁺

Al⁺³ > Al²⁺ > Al⁺

Al⁺² > Al⁺³ > Al⁺

Al⁺² > Al⁺ > Al⁺³

Al⁺³ > Al⁺ > Al⁺²

Al⁺³ < Al⁺ > Al⁺²