D And F Block Elements(Chapter Test - Non Medical) - Class 12 MCQ

Small size

Higher nuclear charge

Availability of vacant d-orbitals

Variable oxidation states

a

b

c

d

2.84

4.90

0

1.73

3MnO^2-₄+4H⁺ -> 4h+->2MnO^-₄ + MnO₂+2H₂O

+3, +2

+3, +6

+2, +6

+2, +3

I only

II only

Both I and II

Neither I nor II

I₂

IO^-

The ionic sizes of Ln(III) decrease in general
with increasing atomic number

Ln(III) compounds are generally colourless

Ln(III) hydroxides are mainly basic in character

Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in character

K₂Cr₂O₇

(NH₄)₂[TiCl₆]

VOSO₄

K₃[Cu(CN)₄]

Co (Z = 27)

Cr (Z = 24)

Mn (Z = 25)

Fe (Z = 20)

The purple colour of the permanganate ion does not arise from d-d transition but from charge transfer

The purple colour of the permanganate ion arises due to d-d transition

The purple colour of permanganate ion arises
due to both d-d transition and charge transfer

For charge transfer to occur in the
permanganate ion the difference in energy
between Mn⁷⁺ and O^2– should be very high

a

b

c

d

With fluorine vanadium can form VF₅

With chlorine vanadium can form VCl₅

Vanadium exhibits highest oxidation state in
oxohalides VOCl₃, VOBr₃ and fluoride VF₅

With iodine vanadium cannot form VI5 due to
oxidation power of V⁵⁺ and reducing nature of I^–

basic nature of CuSO₄ solution

acidic nature of CuSO₄ solution

this is the typical property of CuSO₄

MO is most acidic

M₂O₃ is the most likely to be a strong oxidizing agent

MO₃ is the most acidic

M₂O₇ is the one that cannot be a reducing agent

Blue

Red

Green

Pink

La(OH)₂ is less basic than Lu(OH)₃

In lanthanide series ionic radius of Ln³⁺ ions
decreases

La is actually an element of transition series
rather than lanthanide series

Atomic radii of Zr and Hf are same because of
lanthanide contraction

Shielding power of 4f electrons is quite weak

There is a decrease in the radii of the atoms or ions while proceeding from La to Lu

Lanthanoid contraction is the accumulation of
successive shrinkages

As a result of lanthanoid contraction, the
properties of 3d series of the transition elements show similarities with 4d series of elements

transition metal contraction

the same crystal structure of silver and gold

the high electropositive character of gold in
comparison to silver

the effect of lanthanide contraction

it resembles alkali metals

it has very low value of ionization energy

it has a tendency to attain noble gas
configuration of xenon

It has a tendency to attain f⁰ configuration

CO₂ is formed as the product

reaction is exothermic

Mn²⁺ acts as autocatalyst

I < II < III < IV

I < II < IV < III

II < III < I < IV

III < I < II < IV

I, II, III, IV

III, IV

II, III

I, II

a

b

c

d

a

b

c

d

I and II

II and III

I and III

I, II and III

All lanthanides are highly dense metals

More characteristic oxidation state of lanthanide elements is +3

Lanthanides are separated from one another by ion exchange method

Ionic radii of trivalent lanthanides steadily
increases with increase in the atomic number