Question # 1

Among the lanthandes the one obtained by synthetic method is

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Lu

Pm

Pr

Gd

In the electronic configuration of Cr one electron from 4s sub-shell is transfered to 3d sub-shell because

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The 3rd orbital is of lower energy than 4s

The 4s orbital is of equal energy to 3d orbital

The half filled d-subshell is more stable than incomplete d-sub shell

6 unpaired electrons make Cr more paramagnetic

Which is not a bidentate ligand

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The number of unpaired electrons in ferrous ion ( Z - 26) is

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3

2

4

5

Which of the following is a typical transition metal?

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Sc

Y

Ra

Co

3-d series elements are present in:

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First period

Second Period

Third period

4th period

The protection of steel by chrome plating is due to

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Cathodic protection

Anodic protection

Covering of steel surface

Formation of alloy with iron

Which is in differnet phase form other metals

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Ni

Hg

Cd

Na

Property of transition element is :

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Low m.p and b.p

Parramagnetism

Oxidation state

Low binding energies

Turnbull's blue is a compound called?

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Ferricyanide

Ferrous ferricyanide

Ferrous cyanide

Ferri - Ferro cyanide

Rusting can be avoided by :

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Making alloys

Tin or Zinc plating

Use of enamel

All of these

Solubility of KMnO₄at higher temperature is:

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5%

7%

15%

25%

Most common oxidation states shownby cerium are

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+2, +4

+3, +4

+3, +5

+2, +3

[Cu[NH₃)₄]⁺²will form ______ structure

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Square planar

Tetrahedral

Octahedral

Trigonal bipyramidal

The color of Cr³⁺ion is

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Violet

Blue

Pink

Green

Electronic configuration of Cu⁺²is

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4S², 3d⁹

4s^-1, 3d¹⁰

4S⁰, 3d⁹

None of these

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

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It less reactive than copper

A layer of sulphates is deposited on it

An inert layer of iron oxide is deposited on it

All valence electrons of iron are consumed

The colour of transition metal complexes is due to:

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d-d transitions of electorns

Paramagnetic nature of transition

Ionization

Loss of s-electrons

Addition of iron fillings to CuSO₄solution caused precipitation of Cu owing to the

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Reduction of Cu²⁺

Oxidation of Cu²⁺

Reduction of Fe

Reduction of Fe³⁺

What are alloys

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A homogenous mixture of two or more elements

A homohenous mixture of metal and a non-metal

A homogenous mixture of two or more metals

None of the above

The geometry of [Co(NH₃)₆]³⁺is

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Tetrahedral

Square planar

Octahedral

None of these

Transition elements are called so because:

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Form interstital sompounds

have high m.p

In between 's' and' 'p' block elements

All of these

Corrosion of iron can be prevented by coating the surface with

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Zn

Sn

Ni

Any of the above

Group VI-B of transition elements contains:

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Zn, Cd, Hg

Fe ,Ru ,Os

Cr, Mo ,W

Mn, Te, Re

The colour of transition metal complexes is due to

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d-d transitions of electrons

Para magnetic nature of transition elements

Ionization

Loss of s-electrons

The colour of a transition metal complex is due to d-d transition The colour of the complex is the complementary of the colour absorbed. Thus [Ti(H₂O₆]³⁺abosrbs yellow light and transmits blue and red colours therefore the solution of titanium complex appears

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Blue

Red

Yellow

Mixture of blue and red or violet

What is the name of the comlex [Ni(CO)₄]

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Tetracarbonylnickel (o)

Tetracabonylnickel

Tetracabonylnickel (II)

Tetracabonylnickel (IV)

Which of the following is a non-typical transition elements

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Cr

Mn

Zn

Fe

5-d series is in the period :

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4th

5th

6th

7th

Coordination number of Pt in [PtCl (NO²) (NH³)⁴]^2-

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2^-

4

1

6

Out of 110 known elements, transition elements are

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40

60

50

80

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ECAT Chemistry Chapter 17 Transition Elements Online Test MCQs With Answers

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