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 25

EASY

NEET

IMPORTANT

Earn 100

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

Correct answer is:-

$(a) Li < Be < Na$

$(b) Ni < Cu < Zn$

$(c) Ti > V > Cr$

$(d) Ti > Zr \approx Hf$

50% studentsanswered this correctly

Important Questions on The d- and f-Block Elements

MEDIUM

NEET

IMPORTANT

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

MEDIUM

NEET

IMPORTANT

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 :

MEDIUM

NEET

IMPORTANT

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.	${SiO}_{2} + FeO \to {FeSiO}_{3}$

MEDIUM

NEET

IMPORTANT

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:

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 30

Which of the following statement is incorrect when a mixture of

N a C l

and

K_{2} C r_{2} O_{7}

is gently warmed with conc.

H_{2} S O_{4}

?

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 31

In which of the following, oxidation state of

Mn

is six?

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Chemistry>Chapter 19 - The d- and f-Block Elements>EXERCISE-I (Conceptual Questions)>Q 32

An increase in both atomic and ionic radii with atomic number occurs in any group of the periodic table and in accordance with this the ionic radii of Ti(IV) and Zr(IV) ions are