chemistry MCQs - 12th class Chapter 06 Mcqs

1

Transition elements are defined as elements with partially filled d or f-subshells in their atomic state or any common ______.

A

energy level

B

oxidation state

C

gaseous state

D

molecular form

2

Which elements are referred to as non-typical transition elements?

A

Group IB and IIB

B

Group IIIB and IVB

C

Group IIB and IIIB

D

Group VB and VIB

3

The electronic configuration of Chromium (Cr) is [Ar] 3d⁵ 4s¹ due to the stability of a ______ d-subshell.

A

completely filled

B

empty

C

partially filled

D

half-filled

4

f-Block elements like Lanthanides and Actinides are also known as ______.

A

outer transition metals

B

typical transition metals

C

inner transition metals

D

main group elements

5

The toughness of transition metals, indicating strong metallic binding, is due to the participation of s-electrons and electrons from ______.

A

underlying half-filled d-orbitals

B

fully-filled p-orbitals

C

the nucleus

D

s-orbitals only

6

In a transition series, binding energy is generally strongest up to which group?

A

Group IIB

B

Group IIIB

C

Group VIB

D

Group IA

7

The property of a substance being weakly attracted by a strong magnetic field is called ______.

A

diamagnetism

B

ferromagnetism

C

paramagnetism

D

electromagnetism

8

Paramagnetic behavior is caused by the presence of ______ in an atom, molecule, or ion.

A

paired electrons

B

unpaired electrons

C

protons

D

neutrons

9

Which ion has the highest number of unpaired electrons (5) in the first transition series?

A

Fe³⁺

B

Cu²⁺

C

Sc³⁺

D

Zn²⁺

10

The color in transition metal compounds is attributed to the ______.

A

s-s transition

B

p-p transition

C

d-d transition

D

loss of s-electrons

11

When small non-metal atoms like H, B, C, N enter the interstices of transition metals, they form ______.

A

substitutional alloys

B

complex compounds

C

ionic compounds

D

interstitial compounds

12

In the complex K₄[Fe(CN)₆], the central metal ion is ______.

A

K⁺

B

CN⁻

C

Fe²⁺

D

Fe³⁺

13

Molecules or ions that surround the central metal ion and donate electron pairs are called ______.

A

anions

B

cations

C

chelates

D

ligands

14

The coordination number of iron in K₃[Fe(CN)₆] is ______.

A

4

B

2

C

6

D

3

15

A complex compound containing a polydentate ligand that forms a ring structure is called a ______.

A

complex ion

B

simple salt

C

chelate

D

double salt

16

In IUPAC nomenclature of complex compounds, which are named first?

A

anions

B

cations

C

the metal ion

D

neutral ligands

17

What is the geometry of complexes with sp³ hybridization?

A

Square planar

B

Octahedral

C

Tetrahedral

D

Trigonal bipyramidal

18

The geometry of the [Cu(NH₃)₄]²⁺ complex with dsp² hybridization is ______.

A

Tetrahedral

B

Square planar

C

Octahedral

D

Linear

19

Which of the following is an important ore of iron?

A

Bauxite

B

Pyrolusite

C

Haematite

D

Dolomite

20

Wrought iron is the purest form of commercial iron with a carbon content of ______.

A

2.5 to 4.5%

B

0.12 to 0.25%

C

0.25 to 2.5%

D

5.0% or more

21

The manufacture of wrought iron from cast iron is done in a ______.

A

blast furnace

B

Bessemer's converter

C

open hearth furnace

D

puddling furnace

22

Steel is an alloy of iron with a carbon content between ______.

A

0.01% - 0.1%

B

0.1% - 0.2%

C

2.5% - 4.5%

D

0.25% - 2.5%

23

Which type of steel is used for making rails, axles, and castings?

A

Mild Steel

B

Medium Carbon Steel

C

High Carbon Steel

D

Stainless Steel

24

The Bessemer's process for steel manufacturing uses only ______ as the raw material.

A

wrought iron

B

steel scrap

C

cast iron

D

iron ore

25

The chemical decay of metals due to the action of the surrounding medium is called ______.

A

alloying

B

combustion

C

corrosion

D

reduction

26

In the electrochemical theory of corrosion, impurities in a metal promote corrosion by forming a ______.

A

protective layer

B

galvanic cell

C

neutral solution

D

stable compound

27

The process of coating iron with zinc is known as ______.

A

tin plating

B

electroplating

C

alloying

D

galvanizing

28

In galvanizing, if the zinc coating is damaged, zinc acts as the ______ and protects the iron.

A

cathode

B

anode

C

electrolyte

D

salt bridge

29

Chromates and dichromates are salts of chromic acid and ______ acid, respectively.

A

permanganic

B

dichromic

C

chromous

D

chloric

30

In an aqueous solution, chromate ions (CrO₄²⁻) are converted to dichromate ions (Cr₂O₇²⁻) by adding ______.

A

an acid

B

an alkali

C

water

D

a salt

31

Potassium dichromate (K₂Cr₂O₇) is a powerful ______ agent in acidic solution.

A

reducing

B

dehydrating

C

oxidizing

D

precipitating

32

The test where solid potassium dichromate is heated with a metal chloride and concentrated H₂SO₄ to produce red vapors is the ______ test.

A

ring

B

flame

C

chromyl chloride

D

silver mirror

33

Potassium permanganate (KMnO₄) is prepared on a large scale from the mineral ______.

A

haematite

B

pyrolusite

C

bauxite

D

limonite

34

In Stadeler's process for preparing KMnO₄, ______ is passed through a green solution of K₂MnO₄.

A

CO₂

B

H₂S

C

Cl₂

D

SO₂

35

The deep purple color of KMnO₄ solution is due to the ______ ion.

A

manganate (MnO₄²⁻)

B

manganese (Mn²⁺)

C

permanganate (MnO₄⁻)

D

manganese dioxide (MnO₂)

36

What is the oxidation state of Mn in KMnO₄?

A

+2

B

+4

C

+6

D

+7

37

Which of the following is a typical transition metal?

A

Zn

B

Cd

C

Hg

D

Co

38

The increase in binding energy in the third transition series ends at ______.

A

Tungsten (W)

B

Gold (Au)

C

Mercury (Hg)

D

Lanthanum (La)

39

When electrons are paired in an orbital, the substance becomes ______.

A

paramagnetic

B

diamagnetic

C

ferromagnetic

D

conductive

40

All 3d series elements show a common oxidation state of ______.

A

+1

B

+2

C

+3

D

+4

41

What is the formula for Potassium hexacyanoferrate(II)?

A

K₃[Fe(CN)₆]

B

K₄[Fe(CN)₆]

C

K₂[Fe(CN)₄]

D

K[Fe(CN)₃]

42

The suffix used for anionic ligands in nomenclature is ______.

A

-ate

B

-ite

C

-o

D

-ide

43

Pig iron has a carbon content of ______.

A

0.12 - 0.25%

B

0.25 - 2.5%

C

2.5 - 4.5%

D

less than 0.1%

44

In the Open Hearth process, a basic lining of dolomite (CaO, MgO) is used when impurities are ______.

A

Mn and Si

B

P and S

C

C and Si

D

only Mn

45

The slag produced in the Open Hearth process, containing calcium phosphate, is used as a ______.

A

building material

B

fuel

C

fertilizer

D

reducing agent

46

During the corrosion of aluminum in contact with copper, aluminum acts as the ______.

A

cathode

B

negative electrode

C

positive electrode

D

electrolyte

47

Tin plating is an example of ______.

A

anode coating

B

sacrificial corrosion

C

cathode coating

D

alloying

48

The conversion of chromate to dichromate is an example of ______.

A

a redox reaction

B

an equilibrium shift

C

a precipitation reaction

D

a decomposition reaction

49

In the reaction with H₂S, potassium permanganate oxidizes H₂S to ______.

A

SO₂

B

H₂SO₄

C

S

D

SO₃

50

The total number of d-block elements shown in Table 6.1 is ______.

A

20

B

30

C

40

D

10