Question # 1

Which one of the following elements has no variable valency.

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Zinc

Iron

cobalt

Manganese

Galvanized iron is protected by a thin layer of

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Cr

Zn

Sn

Pb

The variation pattern in ionic radii of first transition series shows

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A regular increase

A regulars decrease

No regular pattern

A regular decrease and than alight increase

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 iron

cast iron > steel > wrought iron

cast iron = steel > wrought iron

The transition elements which are present in 4th period of periodic table have atomic number.

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22 to 30

21 to 30

21 to 29

21 to 31

Co-ordination number of Pt in Pt Cl(NO₂)(NH₃)₄

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2-

4

1

6

In IUPAC system, the name of K4[Fe(CN)6] is

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Potassium ferricynaide

Potassium ferrocynide

Potassium Hexacyanoferrate (II)

Poatssium hexacaynoferrate (III)

The total number of transition element is

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10

14

40

58

d -block elements which show anomalous configuration in first series are

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Cr and Ni

Cr and Cu

Cu and CO

Fe and Ni

Which of the following is a typical transition metal

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Sc

Y

Ra

Co

Which of the following is a non typical transition element.

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Cr

Mn

Zn

Fe

Total number of d-block elements are

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10

20

30

40

Which one of the following complexes is chelate.

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Potassium hexacyanoferrate (II)

Diammine silver (I) Chloride

Tetracarbonylnikel (0)

Sodium dioxalatoplatinate (II)

The strength of binding energy of transition elements depend upon

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number of electron pairs

number of unpaired electron pairs

number of neutrons

number of protons

In [Co(NH3)6]+3 the coordination number of cobalt is.

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Zero

Two

Four

Six

The colour of transition metal complexes is due to

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d-d transition of electrons

Paramagnetic nature of transition elements

Ionization

Loss of s -electrons

Which is not coloured ion

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SO4^-2

MnO4-3

CrO4^-2

Cr2O7^-2

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