Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-3>Q 45

MEDIUM

JEE Main/Advance

IMPORTANT

Earn 100

Which one of the following species is stable in aqueous solution?

25% studentsanswered this correctly

Important Questions on The d- and f-Block Elements

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-3>Q 46

The pair of compounds having metals in their highest oxidation state is:

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-3>Q 47

When

X O_{2}

is fused with an alkali metal hydroxide in presence of an oxidizing agent such as

{KNO}_{3}

; a dark green product is formed which disproportionate in acidic solution to afford a dark purple solution.

X

is:

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-3>Q 48

The transition elements that has the lowest enthalpy of atomisation is:

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-3>Q 49

The element that usually does not show a variable oxidation state is

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-3>Q 50

$A \overset{4 KOH, O_{2}}{\to} \underset{(Green)}{2 B} + 2 H_{2} O$

$3 B \overset{4 HCl}{⟶} \underset{(Purple)}{2 C} + {MnO}_{2} + 2 H_{2} O$

$2 C \overset{H_{2} O, KI}{\to} 2 A + 2 KOH + D$

In the above sequence of reactions, $A$ and $D$ , respectively, are:

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-3>Q 52

The correct order of spin-only magnetic moments among the following is? (Atomic number:

M n = 25, C o = 27, N i = 28, Z n = 30) .

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-4>Q 1

Which of the following ions will show the highest magnetic moment (

Z

values for neutral atoms are as follows:

N = 7, Cr = 24, Fe = 26

and

Co = 27

)

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>Exercise-4>Q 2

The element, which exhibits both vertical and horizontal similarities are