Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 42

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JEE Main

IMPORTANT

Earn 100

The unstable green colored $K_{2} {MnO}_{4}$ is converted to purple color. Then the correct statements are
a. It is a disproportionation reaction.
b. The product formed is ${KMnO}_{4}$ .
c. Nature of the overall solution becomes alkaline.
d. It produces black precipitates of ${MnO}_{2}$ .

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Important Questions on The d- and f-block Elements

MEDIUM

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 43

Which of the following represents the incorrect order of property mentioned?

HARD

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 44

If

M n^{2 +}

has

' X'

number of unpaired electrons and

' Y'

other positive oxidation states than

+ 2

. What is the sum of

X + Y

here?

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 45

Consider the following transition metal ions.

V^{2 +}, {Fe}^{2 +}, {Zn}^{2 +}, {Ti}^{4 +}, {Mn}^{3 +}, {Sc}^{3 +}

The number of ions that form colourless aqueous solution is ______.

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JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 46

The oxidation number of

Mn

in the product of alkaline oxidative fusion of

M n O_{2}

is

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JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 47

The number of unpaired electrons in high spin octahedral complexes of

{Co}^{3 +} (d^{6})

is _______.

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JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 48

How many of the following are amphoteric oxides?

$MnO, {Mn}_{3} O_{4}, {Mn}_{2} O_{3}, {MnO}_{2}, {Mn}_{2} O_{7}$

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 49

The electronic configuration of

Ce (Z = 58)

is

[Xe] 4 f^{x} 5 d^{x} 6 s^{y} .

The value of

{}^{'}x^{'}

is

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 2>Q 50

The electronic configuration of

{Mn}^{x +}

ion is

[Ar]

3 d^{4} .

The value of

{}^{'}x^{'}

is _________.