Question # 1

The percentage of carbon in different types of iron products is in the order of:

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Cast iron > wrought iron > steel

wrought iron > steel > cast rion

Cast iron > steel > wrought iron

Cast iron = steel > wrought iron

The total number of d-bock transition element is

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10

14

40

30

German silver does not contain

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Cu

Zn

Ni

Mn

Platinum (IV) chloride combines with ammonia to form compounds in which the coordination number of the platinum is 6. A formula unit on one of the compound contains a cation and only two chloride ions. What is the formula of this compound

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Pt(NH₃)₆CI₄

Pt(NH₃)₅CI₄

Pt(NH₃)₄CI₄

Pt(NH₃)₃CI₄

IIB elements (Zn, Cd, Hg) and III B elements (Sc, Y and La) are

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Non typical transition element

Typical transition element

Normal elements

Inner transition element

What is the shape of Fe(CO)₅molecule?

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Tetrahedral

Octahedral

Trigonal bipyramidal

Square pyramidal

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

The total number of transition elements is

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10

14

40

50

The number of unpaired electrons in Fe³⁺(Z = 26) are

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5

6

3

4

Which is the correct electronic configuration of Cr - 24

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1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁴, 4s²

1s², 2s², 2p⁶, 3s², 3p⁶, 3d³, 4s², 4p¹

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵, 4s¹

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵, 4p¹

Which of the following is not correct about transition metals?

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Their melting and boiling points are high

Their compounds are generally coloured

They can form ionic or covalent compounds

They do not exhibit variable valency

Which of the following is not related to transition metals

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They have a high tensile strength

They are ductile

They are malleable

They have low melting points

Which of the following is a non-typical transition elements

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Cr

Mn

Zn

Fe

Solubility of KMnO₄at higher temperature is:

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5%

7%

15%

25%

Corrosion of iron can be prevented by coating the surface with

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Zn

Sn

Ni

Any of the above

Which of the following metals is sometimes found in native state in nature?

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Al

Cu

Fe

Mg

All 3d series elements show variable oxidation states. The one shown by all 3d elements is

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+2

+3

+4

+5

Turnbull's blue is a compound called?

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Ferricyanide

Ferrous ferricyanide

Ferrous cyanide

Ferri - Ferro cyanide

Rusting of iron is catalysed by

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Fe

O₂

Zn

H⁺

In physical and chemical properties, transition elements show

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Similarities

Dissimilarities

Both of these

Somestimes similarities, sometimes dissimilarities

Property of transition element is :

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Low m.p and b.p

Parramagnetism

Oxidation state

Low binding energies

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

Besides Zn and Cu , German silver contains the metal

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Sn

Ag

Ni

Mg

A transition metal complex can be recognized by various terms. Which is not the proper term

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Central metal ion

Coordination number

Ligand

Geometry of complex

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

What is wrong about transition metals?

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Diamagnetic

Paramagnetic

Form complexes

Shows variable oxidation state

Which alloy contains 50% copper, 25% zinc and 25% nickel

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German silver

Gun metal

Bell metal

Brass

Series starting form ₃₉Y to ₄₈CD is in period:

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4th

5th

6th

7th

The compound which gives oxygen on moderate heating is

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Zinc oxide

Mercuric oxide

Aluminium oxide

Ferric oxide

Which is in differnet phase form other metals

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Ni

Hg

Cd

Na

The Mn³⁺has ______ color

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Violet

Green

Red/brown

No color

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