The colour of K M n O 4 is due to: [where M → metal, L → ligand]

L → M charge transfer transition

M → L charge transfer transition

EASY

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${CrO}_{4}^{2 -}$ (yellow) changes to ${Cr}_{2} O_{7}^{2 -}$ (orange) in $pH = x$ & vice-versa in $pH = y$ . Hence, $x$ & $y$ are :-

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Important Questions on Transition and Inner Transition Elements

EASY

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

The ionic charges of manganate and permanganate ion are respectively

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

The colour of

K M n O_{4}

is due to: [where

M \to

metal,

L \to

ligand]

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

Thermal decomposition of a Mn compound

(X)

513 K

results in compound

Y,

M n O_{2}

and a gaseous product.

M n O_{2}

reacts with

N a C l

and concentrated

H_{2} S O_{4}

to give a pungent gas

Z

X, Y

and

Z,

respectively, are:

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

Which of the following statements is/are false?

HARD

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

Which one of the following statements is correct when

S O_{2}

is passed through acidified

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

solution?

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

A mixture of

NaCl

and

K_{2} {Cr}_{2} O_{7}

is heated with conc.

H_{2} {SO}_{4}

, deep red vapours and formed. Which of the following statement is false ?

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

The manganate and permanganate ions are tetrahedral, due to:

EASY

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

{MnO}_{2} + KOH \overset{Air}{\to} ?

EASY

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

In alkaline medium, the reaction of hydrogen peroxide with potassium permanganate produces a compound in which the oxidation state of

M n

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

Which of the following is not formed when H₂S reacts with acidic K₂Cr₂O₇ solution ?

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

The incorrect statement is:

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

Name the gas that can readily decolourise acidified

{KMnO}_{4}

solution.

EASY

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

Acidified potassium dichromate is treated with hydrogen sulphide. In the reaction, the oxidation number of chromium

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

When a mixture of manganese dioxide, potassium hydroxide and potassium chlorate is fused, the product obtained is

EASY

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

When dil. sulphuric acid reacts with aqueous solution of potassium chromate, the colour changes from yellow to orange. This shows that

EASY

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

A solid

' X'

on reaction with

dil HCl

liberates a gas

' Y'

, which decolorises acidified

{KMnO}_{4}

X, Y

respectively are:

EASY

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

Aqueous solution of a salt

(A)

forms a dense white precipitate with

{BaCl}_{2}

solution. The precipitate dissolves in dilute

HCl

to produce a gas

(B)

which decolourises acidified

{KMnO}_{4}

solution.

A

and

B

respectively are :

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

Fusion of

M n O_{2}

with

K O H

in presence of

O_{2}

produces a salt

W .

Alkaline solution of

W

upon electrolytic oxidation yields another salt

X .

The manganese containing ions present in

W

and

X,

respectively, are

Y

and

Z .

Correct statement(s) is (are)

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

M n O_{2}

when fused with

K O H

and oxidized in air gives a dark green compound

X .

In acidic solution,

X

undergoes disproportionation to give an intense purple compound

Y

and

M n O_{2} .

The compounds

X

and

Y,

respectively, are

MEDIUM

Chemistry>Inorganic Chemistry>Transition and Inner Transition Elements>Potassium Dichromate and Potassium Permanganate

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:

CrO42- (yellow) changes to Cr2O72- (orange) in pH=x & vice-versa in pH=y. Hence, x & y are :-

Important Questions on Transition and Inner Transition Elements

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${CrO}_{4}^{2 -}$ (yellow) changes to ${Cr}_{2} O_{7}^{2 -}$ (orange) in $pH = x$ & vice-versa in $pH = y$ . Hence, $x$ & $y$ are :-