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

MEDIUM

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Identify correct statements from below:

A. The chromate ion is square planar.

B. Dichromates are generally prepared from chromates.

C. The green manganate ion is diamagnetic.

D. Dark green coloured $K_{2} {MnO}_{4}$ disproportionates in a neutral or acidic medium to give permanganate.

E. With increasing oxidation number of transition metal, ionic character of the oxides decreases.

Choose the correct answer from the options given below:

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Important Questions on The d- and f-Block Elements

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

The manganate and permanganate ions are tetrahedral, due to:

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

The number of water molecules not coordinated to copper ion directly in

C u S O_{4} \cdot 5 H_{2} O,

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

The ionic charges of manganate and permanganate ion are respectively

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ______________.

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

Name the gas that can readily decolourise acidified

{KMnO}_{4}

solution.

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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>The d- and f-Block Elements>Some Important Compounds of Transition Metals

A metal

(A)

on heating in nitrogen gas gives compound

B .

B

on treatment with

H_{2} O

gives a colourless gas which when passed through

C u S O_{4}

solution gives a dark blue-violet coloured solution.

A

and

B

respectively, are:

HARD

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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>The d- and f-Block Elements>Some Important Compounds of Transition Metals

The incorrect statement is:

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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:

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

An aqueous solution consists of

{Pb}^{2 +}

and

{Cu}^{2 +}

ions. Which of the following reagents is suitable for separating them?

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

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>The d- and f-Block Elements>Some Important Compounds of Transition Metals

Which of the following statements is/are false?

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Some Important Compounds of Transition Metals

The colour of

K M n O_{4}

is due to: [where

M \to

metal,

L \to

ligand]

Important Questions on The d- and f-Block Elements

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