Question # 1

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The geometry around 'N' atom in trimethylamine is pyramidal

The geometry around N atom in trisilylamine is planar

The nitrogen atim is trimethylamine is sp2 hybridized whilst in trisilylamine it is sp2 hybridized

Trisilylamine has donor properties whilst trimethylamine has no donor properties.

Stainless steel consists of which elements.

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Fe only

Cr only

Fe and Ni

Fe ,Ni and Cr

Sodium react more vigorously than lithium because.

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It is a metal

It has higher atomic mass

It is more electronegative

It is more electropositive

The correct order of electron affinities is.

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C > Si, > Na > Ar

Si > Cl > Na > Ar

C > Na > Si > Ar

C > Si > Ar > Na

When Phosphate rock Ca3(PO4) 2 is converted to phosphorus.

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One of the products of the reaction is water

Sulphuric acid is added to generate insoluble calcium sulphate

Hydrogen is used to reduce the phosphate to phosphorus

Silica is added to form a calcium silicate slag

The electron gain enthalpy of chlorine is -349 Kj mol-1 ionization energy of Cl would be.

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-349 kJ mol -1

349 kJ mol-1

-698 kJ mol-1

698 kJ mol-1

The gases that are responsible for green house effect are.

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CO2 & CH4

CFC

N2O

All above

Electron gas theory fails to explain

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Specific heat of metals

Electrical and thermal conductivity

Paramagnetic behavior of metals

All of the above

Which trihalide is not hydrolysed by water

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NF3

NCl3

PCl3

AsCl3

The oxidation number Xe in XeOF2 is

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0

+2

+4

+3

According to the VSEPR theory, the shape of the SO3 molecule is.

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Pyramidal

Tetrahedral

Trigonal planar

Distorted totrahedron

Pick out the incorrect statement for XeF4

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XeF4 disproportionate violently with water

It is used as fluorinating agent

It has octahedral structure for geometry

It oxidizes I to I₂

Which of the following is the strongest oxidant.

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F2

Cl2

br2

I2

Which one of the following has a linear structure.

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H2O

CO2

NO2

SO2

The most electronegative element of the third period is.

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F

P

Br

Cl

The green colour of glass is due to the presence of.

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Chromium (III)

Cobalt (II)

Mn (IV)

Iron(III)

According to CFT the metal ligand bond is considered to be ionic to presentage.

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100%

90%

50%

70%

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

Tetra halides do not undergo hydrolysis

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C

Si

Sn

Pb

The matrix is usually in the form of.

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Sand

Limestone

Rocks

All

The different layers in graphite are held together by

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Ionic bonding

Metallic bonding

Covalent bonding

Van der Waals forces

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