Question # 1

Out of 110 known elements, transition elements are

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40

60

50

80

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

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Square planar

Tetrahedral

Octahedral

Trigonal bipyramidal

Bessemer converter is used in the manufacture of

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Pig iron

Steel

Wrought iron

Cast iron

Content of carbon in steel is:

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0.12 to 0.25%

0.25% to 2.5%

3.0 to 3.5%

4.0 to 4.5%

Rusting of iron is catalysed by

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Fe

O₂

Zn

H⁺

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 metals is sometimes found in native state in nature?

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Al

Cu

Fe

Mg

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

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I

II

III

IV

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

Maximum variable oxidation state is of:

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Mn⁺²

Fe⁺³

Cr⁺¹

a and b

Which has the largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

Potassium ferrocyanide is a

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Mixed salt

Double salt

Complex salt

Normal salt

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 formula of curprite is

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Cu₂S

Cus

Cu₂O

CuCO₃

Misch mental is

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An alloy of Aluminium

A mixture of chromium and lead chromate

An alloy of lanthanoid metals

An alloy of copper

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]

Which of the following is a carbonate are?

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Pyrolusite

Malchite

Diaspore

cassiterite

Which element does not belong to 4d series

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Y

Zr

Mo

Zn

Fe⁺³and Mn²⁺are strong paramagnetic because the number of unpaired electrons in each is

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4

5

6

7

Bell metal is an alloy of

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Cu, Zn, and Sn

Cu, Zn and Ni

Cu and Zn

Cu and Sn

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

The equivalent weight of KMnO₄(formula weight = M) when it is used as an oxidant in neutral medium is

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M

M/2

M/3

M/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 used as disinfectant

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K₂Cr₂O₇

KMnO₄

K₂MnO₄

K₂CrO₄

The geometrical shape of a transition complexion is related to the state of hybridizing of the central atom. What is trigonal bipyramidal

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sp³

dsp²

dsp³

d²sp³

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

The iron obtained from blast furnace is

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Pig iron

Wrought ion

Soft ion

Steel

Group VIB of transition elements contains

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Zn, Cd, Hg

Fe, Ru, Os

Cr, Mo, W

Mn, Te, Re

The compound which gives oxygen on moderate heating is

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Zinc oxide

Mercuric oxide

Aluminium oxide

Ferric oxide

d-block elements closely resemble in their physical and chemical properties. Which statement is incorrect

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They show variable valency

Their ions and compounds are coloured

They are good conductors of heat and electricity

Their compounds are diamagnetic

Which of the following acts as ligand

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NH₃

NH₂-- CH₂-- CH₂-- NH₂

C₂O^2-₄

All these

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