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

Consider the following reactions (unbalanced) Z n + H o t c o n c . H 2 S O 4 → G + R + X Z n + c o n c . N a O H → T + Q G + H 2 S + N H 4 O H → Z a p r e c i p i t a t e + X + Y Choose the correct option(s).

The oxidation state of Z n in T is + 1

MEDIUM

Earn 100

Out of the following how many of them are coloured compounds:

$M n {O_{4}}^{⊝}, C r_{2} {O_{7}}^{2 -}, C r {O_{4}}^{2 -}, S c^{3 +}, T i^{4 +}, Z n^{2 +}, M n^{3 +}, C u^{2 +}, F e^{2 +}, F e^{3 +}$

50% studentsanswered this correctly

Important Questions on The d- and f-Block Elements

EASY

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

Which of the following combinations will produce

H_{2}

gas?

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

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

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:

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]

MEDIUM

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

The manganate and permanganate ions are tetrahedral, due to:

MEDIUM

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

Aqueous solution of metallic nitrate

X

reacts with

N H_{4} O H

to form Y which dissolves in excess

N H_{4} O H

. The resulting complex is reduced by acetaldehyde to deposit the metal.

X

and

Y

respectively, are

MEDIUM

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

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 ?

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

Which of the following statements is/are false?

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

MEDIUM

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

Consider the following reactions (unbalanced)

Z n + H o t c o n c . H_{2} S O_{4} \to G + R + X

Z n + c o n c . N a O H \to T + Q

G + H_{2} S + {N H}_{4} O H \to Z (a p r e c i p i t a t e) + X + Y

Choose the correct option(s).

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

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

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:

MEDIUM

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

Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is

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

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

With reference to aqua regia, choose the correct option(s).

MEDIUM

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

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)

Out of the following how many of them are coloured compounds: MnO4⊝, Cr2O72-, CrO42-, Sc3+, Ti4+, Zn2+, Mn3+, Cu2+, Fe2+, Fe3+

Important Questions on The d- and f-Block Elements

Learn and Prepare for any exam you want !

Out of the following how many of them are coloured compounds:

$M n {O_{4}}^{⊝}, C r_{2} {O_{7}}^{2 -}, C r {O_{4}}^{2 -}, S c^{3 +}, T i^{4 +}, Z n^{2 +}, M n^{3 +}, C u^{2 +}, F e^{2 +}, F e^{3 +}$