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

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

Earn 100

If the number of reactions produces white residue (colour is observed after cooling) $= x .$ Find the value of $1.2 x$ .

(a) $ZnS + O_{2} \overset{Δ}{⟶}$
(b) ${ZnCO}_{3} \cdot 3 Zn (OH)_{2} \overset{Δ}{⟶}$
(c) $Zn {({NO}_{3})}_{2} + Co {({NO}_{3})}_{2} \overset{Δ}{⟶}$
(d) ${ZnCl}_{2} \cdot 2 H_{2} O \overset{Δ}{⟶}$
(e) $Zn (OH)_{2} \overset{Δ}{⟶}$

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Important Questions on The d- and f-Block Elements

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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

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

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

Which of the following combinations will produce

H_{2}

gas?

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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>Important Properties of Compounds of Zinc

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:

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

The manganate and permanganate ions are tetrahedral, due to:

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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>Important Properties of Compounds of Zinc

Name the gas that can readily decolourise acidified

{KMnO}_{4}

solution.

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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

HARD

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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>Important Properties of Compounds of Zinc

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>Important Properties of Compounds of Zinc

Consider the following reactions:

NaCl + K_{2} {Cr}_{2} O_{7} + \underset{(Conc.)}{H_{2} {SO}_{4}} \to (A) +

side products

(A) + N a O H \to (B) +

side products

(B) + \underset{(dilute)}{H_{2} S O_{4}} + H_{2} O_{2} \to (C) +

side products
The sum of the total number of atoms in one molecule each of

(A), (B)

and

(C)

is ________

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

The ionic charges of manganate and permanganate ion are respectively

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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>The d- and f-Block Elements>Important Properties of Compounds of Zinc

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>Important Properties of Compounds of Zinc

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

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

Which of the following statements is/are false?

MEDIUM

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>Important Properties of Compounds of Zinc

The colour of

K M n O_{4}

is due to: [where

M \to

metal,

L \to

ligand]

If the number of reactions produces white residue (colour is observed after cooling) =x. Find the value of 1.2x. (a) ZnS+O2⟶Δ (b) ZnCO3·3Zn(OH)2⟶Δ (c) ZnNO32+CoNO32⟶Δ (d) ZnCl2·2H2O⟶Δ (e) Zn(OH)2⟶Δ

Important Questions on The d- and f-Block Elements

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