${\mathrm{TiF}}_6^{2-}$ and ${\mathrm{CoF}}_6^{3-}$ 

Cu₂Cl₂  and ${\mathrm{NiCl}}_4^{2-}$

${\mathrm{TiF}}_6^{2-}$ and Cu₂Cl₂ 

${\mathrm{CoF}}_6^{3-}$ and ${\mathrm{NiCl}}_4^{2-}$ 

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

Lanthanoid contraction is the accumulation of successive shrinkages

As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements

Shielding power of 4f electrons is quite weak

Zr and Y have about the same radius .

Zr and Zn have the same oxidation state.  

Zr and Hf have about the same atomic radius .

Zr and Nb have a similar oxidation state.

More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

Lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

Greater metallic character of the lanthanoids than that of the corresponding actinoids

More active nature of the actinoids

Thorium, Th: $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{14}6{\mathrm{d}}^{1}7{\mathrm{s}}^2$

Lawrencium, Lr: $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{14}6{\mathrm{d}}^{1}7{\mathrm{s}}^2$

Neptunium, Np: $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{14}6{\mathrm{d}}^{1}7{\mathrm{s}}^2$

Protactinium, Pa: $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{14}6{\mathrm{d}}^{1}7{\mathrm{s}}^2$

 The number of oxidation states increases on moving from Sc to Mn. 

 The relative stability of the +2 oxidation state increases on moving from top to bottom.

 The relative stability of the +2 oxidation state decreases on moving from top to bottom.

Both (1) and (2) 

Ni²⁺, Ti³⁺             

Sc³⁺, Ti³⁺

Sc³⁺, Co²⁺           

Ni²⁺, Cu⁺

 $Sc>Ti>V>Cr$                               

 $Co>Ni>Cu>Zn$                                      

 $S^{2-}>C{l}^{-}>O^2>N^{3-}$                         

None of these

They are malleable and ductile

They have high melting and boiling points

They crystallise with body centered cubic and hexagonal close packed structure only

They show variable oxidation states although not always 

Europium shows +2 oxidation state

The basicity decreases as the ionic radius decreases from Pr to Lu

All the lanthanons are much more reactive than aluminium

Ce (+4) solutuion are widely used as oxidising agent in volumetric analysis

The solution is decolourized

SO₂ is reduced

Green Cr₂(SO₄)₃ is formed

The solution turns blue

[Xe]4f⁸6d²                   

[Xe]4f⁹5s¹

[Xe]4f⁷5d¹6s²                   

[Xe]4f⁶5d²6s²

FeSO₄

FeSO₃

FeC₂O₄

Fe(NO₂)₂

Negligible screening effect of 'f' orbitals

Increasing nuclear charge

Decreasing nuclear charge

Decreasing screening effect

Ce²⁺

Eu²⁺

Sm²⁺

Yb²⁺

They retain metallic conductivity.

They are chemically reactive.

They are much harder than the pure metal.

They have higher melting points than the pure metal.

lnvar

Steel

Bell metal

Bronze

On passing H₂S through acidified K₂Cr₂O₇ solution, a milky colour is observed

Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumteric analysis

K₂Cr₂O₇ solution in acidic medium is orange

K₂Cr₂O₇ solution becomes yellow on increasing the pH beyond 7

strong metallic bond due to d¹⁰ configuration

weak metallic bond due to d⁵ configuration

weak metallic bond due to d⁷ configuration

none of the above

the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

the same effective nuclear charge from Ce to Lu

the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

Metalloids

Transition elements

Non-metals

Noble gas

[Cu(CN)₄]^3-,(CN)₂

CuCn,(CN)₂

[Cu(CN)₄]^2-,(CN)₂

Cu(CN)₂,K₂S

6, and 8

6, and 5

8, and 6

7, and 7

Fe₂O₃ +H₂

Fe₃O₄ +H₂

FeO +H₂

FeO+ H₂ +O₂

NaBr

NaCl

NaNO₃

NaI

dil . H₂SO₄

dil. HCl

Conc. HNO₃

Conc. H₂SO₄

FeC₂O₄

Fe₂(C₂O₄)₃

K₄Fe(CN)₆

FeSO₄

Cr

Fe

Cu

Mo

d-d transition

Charge transfer spectra

Polarisation of ion

p-d transition

Fe

Mn

Cu

Zn