Question # 1

Which is not an ore of iron

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haematite

Magnetite

limonite

Cassiterite

Total number of d-block elements are

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10

20

30

40

Which is not coloured ion

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SO4^-2

MnO4-3

CrO4^-2

Cr2O7^-2

Which one of the following elements shows variable valency, can act as a catalyst and form coloured compounds.

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Carbon

Chlorine

Sulpur

Iron

Which element shows highest oxidation state among these

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Zn

Fe

Mn

Sc

The type of hybridization in PCl3 is.

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dsp2

sp3

dsp3

d2sp3

Which one of the following elements commonly exhibits oxidation states of +6 and +3 in aqueous solution.

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Na

Cr

Mg

C

Which of the following is non-typical transition metal

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Fe

Mn

Zn

Ni

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

Group VI B of transition elements contains.

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Zn, Cd, Hg

Fe, Ru,Os

Cr, Mo, W

Mn, Te, Re

Which of the following is a typical transition metal.

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Sc

Y

Ra

CO

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

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2-

4

1

6

Stainless steel is

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Compound

An element

Mixture

100% pure iron

The chemical composition of pyrolusite is.

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KMnO4

K2MnO4

MnO2

MnO

The substance which is added to remove impurities is known as

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Slag

Flux

Ore

Gangue

Element of which group are called non typical transition elements.

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IB

II B

II A

VII B

Group VI-B of transition elements contains

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Zn, Cd, Hg

Fe, Ru, Os

Cr, Mo, W

Mn, Te, Re

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