All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 39

EASY

12th ICSE

IMPORTANT

Earn 100

The first few members of the series are quite reactive. They usually form oxides and hydroxides. Complete the following reactions of lanthanoids: $Ln \overset{Heated with N}{\to}$

Important Questions on d-and f-Block Elements

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 39

The first few members of the series are quite reactive. They usually form oxides and hydroxides. Complete the following reactions of lanthanoids. (ii)

Ln \overset{With halogens}{\to}

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 39

The first few members of the series are quite reactive. They usually form oxides and hydroxides. Complete the following reactions of lanthanoids. (iii) $Ln \overset{Burns in O_{2}}{\to}$

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 40

{NbF}_{4}

is paramagnetic while

{NbX}_{4} (X = Cl, Br, I)

are diamagnetic, why?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 40

Out of

La (OH)_{3}

and

Lu {(OH)}_{3}

, which is more basic and why?

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 41

Write the steps involved in the preparation of

K_{2} {Cr}_{2} O_{7}

from

{Na}_{2} {CrO}_{4}

.

EASY

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 41

Write the steps involves in the preparation of

{KMnO}_{4}

from

K_{2} {MnO}_{4}

.

MEDIUM

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 41

What is the effect of lanthanoid contraction on the chemistry of the lanthanoids?

MEDIUM

12th ICSE

IMPORTANT

All In One ISC Chemistry Class 12>Chapter 8 - d-and f-Block Elements>Chapter Practice>Q 42

A blackish-brown coloured solid

A

which is an oxide of manganese, when fused with alkali metal hydroxide and an oxidising agent like

{KNO}_{3}

, produces a dark green coloured compound

B

which on disproportionation in neutral and acidic solution gives a purple coloured compound

C

. Identify

A

,

B

and

C

and write the reaction involved when compound

C

is heated to

513 K

.