Question # 1

Which of the following metal exhibits more than one oxidation?

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Na

Mg

Fe

Al

Sodium thisoulophate is used in photography because of its

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Oxidizing behaviour

Reducing behaviour

Complexing behaviour

Photochemical behaviour

Which of the following element is responsible for oxidation of water to O₂in biological process?

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Fe

Mn

Cu

Mo

[Ti(H₂O)₆]⁺³ion absorbs colour:

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Blue

Yellow

Green

Red

In physical and chemical properties, transition elements show

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Similarities

Dissimilarities

Both of these

Somestimes similarities, sometimes dissimilarities

Steel may be manufacture by two processes which two are correct

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Open hearth process and besemer process

Open hearth process and Haber process

Bassemer process and Haber process

Contact process and Haber process

Stainless steel contains Cr upto

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12%

18%

10%

5%

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

Which of the following is a typical transition metal?

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Sc

Y

Ra

Co

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

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+2

+3

+4

+5

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

In an ooctahedral crystal field splitting, the number of orbitals pushed down in energy is

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3

2

5

Zero

Mercury is the only metal which is liquid at 0°C. this is due to its

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Very high ionization energy and weak metallic bond

Low ionization potential

High atomic weight

High vapour pressure

Bell metal is an alloy of

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Cu, Zn, and Sn

Cu, Zn and Ni

Cu and Zn

Cu and Sn

Bronze is an alloy which contains

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60% cu

70% cu

80% cu

99% cu

The less reactivity of transition metal is due to

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High heats of sublimation

High ionization energies

Low heats of salvation

All 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

Which element belong to 5d series

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V

Nb

Pd

Hf

4-d series is in the period:

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4th

5th

6th

7th

During oxidation in k₂Cr₂O_{7, Cr VI changes to :}

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I

II

III

IV

Which of the following is a transition element

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Sr

Sn

Cr

Pb

Group VIB of transition elements contains

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Zn, Cd, Hg

Fe, Ru, Os

Cr, Mo, W

Mn, Te, Re

3-d series elements are present in:

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First period

Second Period

Third period

4th period

Among the lanthandes the one obtained by synthetic method is

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Lu

Pm

Pr

Gd

The total number of transition elements is

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10

14

40

50

Potassium hexacyanoferrate (II) has the formula

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K₄[Fe(CN)₆]

K₃[Fe(CN)₆]

K₂[Fe(CN)₆]

K [Fe(CN)₆]

Bronze is an alloy of Cu and

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Zn

As

Sb

Sn

Which is the formula of tetra-ammine chloronitro platinum (VI) sulphate?

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[Pt(NH₃)₄(NO₂)]SO₄

[PtNO₂Cl(NH₃)₄]SO₄

[PtCl(NO₂)(NH₃)₄]SO₄

[Pt(NH₃)₄(NO₂)Cl]SO₄

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

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4th

5th

6th

7th

The amount of Ni in stainless steel is

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3%

4%

5%

8%

Which of the following has the maximum number of unpaired d-electrons?

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Zn

Fe²⁺

Ni³⁺

Cu⁺

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