More number of oxidation state are exhibited by the actinoids than by lanthanoids. The main reason for this is;

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

Greater metallic character of lanthanoids than that of their corresponding actinoids.

More active nature of actinoids.

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

Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 21

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Earn 100

Which of the following $f -$ block elements, will change its group on emitting $α -$ particle (alpha particle) :
( $1$ ) ${}_{58}{Ce}$
( $2$ ) ${}_{70}{Lu}$
( $3$ ) ${}_{90}{Th}$
( $4$ ) ${}_{92}U$
Correct answer is :-

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Important Questions on The d- and f-Block Elements

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 22

Which of the following has almost similar size :

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 23

The number of electrons in the

M -

shell of the element with atomic number

24

is

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 24

Among the lanthanides, the one obtained by synthetic method is:

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 25

Which of the following orders of atomic radii are correct:-

Correct answer is:-

$(a) Li < Be < Na$

$(b) Ni < Cu < Zn$

$(c) Ti > V > Cr$

$(d) Ti > Zr \approx Hf$

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 26

Which of the following process involves smelting

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 27

Which metal can be purified by distillation :

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 28

Match the following :-

	I		II
(A)	Calcination	a.	$2 {Cu}_{2} S + 3 O_{2} \to 2 {Cu}_{2} O + 2 {SO}_{2}$
(B)	Roasting	b.	${Fe}_{2} O_{3} \cdot {nH}_{2} O \to {Fe}_{2} O_{3} + {nH}_{2} O$
(C)	Flux	c.	${Cr}_{2} O_{3} + 2 Al \to {Al}_{2} O_{3} + 2 Cr$
(D)	Thermite	d.	${SiO}_{2} + FeO \to {FeSiO}_{3}$

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Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 29

Compounds A and B are treated with dilute HCl separately. The gases liberated are Y and Z respectively. Y turns acidified K₂Cr₂O₇ paper green while Z turns lead acetate paper black. The compounds A and B are respectively: