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

MEDIUM

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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?

EASY

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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

HARD

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 3>Q 1

Which of the following compound is expected to show similar magnetic behaviour?

(Atomic number of $Fe$ is $26, Cu$ is $29, V$ is $23, Mn$ is $25$ )

HARD

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 3>Q 2

A mixed oxide of iron and chromium,

{FeOCr}_{2} O_{3}

, is fused with

{Na}_{2} {CO}_{3}

in the presence of air, to form a yellow compound "

A

''. On acidification, the compound "

A

" forms an orange compound "

B

", which is a strong oxidizing agent.

A

and

B

respectively, are:

HARD

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 3>Q 3

A compound

X

reacts with rubidium chloride in the presence of an acid to give orange-red fumes of

Y

. Then

X

and

Y

respectively, are:

HARD

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 3>Q 4

$A$ and $B$ in the following reaction, respectively, are:

$K_{2} {Cr}_{2} O_{7} + HCl \to KCl + A + B + H_{2} O$

HARD

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 3>Q 5

Barium ions,

{CN}^{-}

and

{Co}^{2 +}

, form an ionic complex. If this complex is

75 %

ionised in an aqueous solution with Van't Hoff factor equal to four and magnetic moment

1.73 BM

(due to spin only), then the formula of the complex is:

HARD

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 27 - The d- and f-block Elements>Level 3>Q 6

Which of the following arrangements does not represent the correct order of the property stated against it?