Question # 1

The geometry of the molecule is primarily decided by

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Bond pairs around the central atom

No of k bond around the central atom

No of bond pairs as well as lone pairs around the central atom

No. of lone pairs on central atom

Aluminium is used for.

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Making ultensile & framea

Making alloys

Reducing agent

All above

The Hall process involves the reduction of Al2O3 to aluminium by

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Carbon

Carbon monoxide

Molecular hydrogen

Electrolysis

The correct order of thermal stabilities of hydriedes of group 15 is.

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NH3 > PH3 > AsH3 > BiH3> SbH3

NH3 > PH3 >AsH3 > SbH3> BiH3

NH3 < PH3 < SbH3 > AsH3 > BiH3

BiH3 > Sb H3 > AsH3 > PH3 > NH3

In the Lewis formula of which of the following species, the number of single double and dative bonds are equal

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N2O5

HNO3

SO2

SOCl2

Arrange the following in order of increasing boiling point.

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CH3OH < CH3Cl < RbCl < CH4

CHOH < CH4 < CH3Cl < RbCl

RbCl < CH3Cl < CH3OH < CH4

CH4 < CH3Cl < CH3OH < RbCl

Which of the following halide has lowest melting point.

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NaCl

NaF

NaBr

NaI

According to systematic nomenclature which hydrogen compound is sulphane.

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HF

Si H4

SF4

H2S

The nature of bonds in compounds of carbon and silicon is mostly

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Covalent

Electrovalent

Metallic

Both A and B

The Lewis formula of SOCl2 the total number of bond pairs and lone pairs of electrons around sulphur are.

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2,1

2 ,2

3 ,1

3 ,0

Which of tetra chloride is resistant to hydrolysis.

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CCl4

SiCl4

GeCl4

SnCl4

The three isotopes of hydrogen differ from one another in

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Atomic number

Number of protons

Nuclear charge

Nuclear mass

Nitric acid is used in the manufacturing of.

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Dyes

Drugs

Artificial silk

All above

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

Example of intra molecular hydrogen bonding.

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O-nitrophenol

O-hydroxy benzaldehyde

O- hydroxy benzoic acid

All of the above

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

The element having electronic configuration 1s2, 2s2, 3s2, 3p3 is.

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Trivalent only

Tetravalent only

Trivalent and pentavalent

Pentavalent only

Pick out the incorrect statements for transition metals.

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They have low melting and boiling points

5d-element have higher energies than 3d or 4 d elements

Zr and Hf have almost identical atomic and ionic radii

They form interstitial compounds.

A trend which is common to elements of both the group IA and group VII A ongoing from top to bottom.

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Boiling point increases

Electron affinity increases

Oxidizing power increases

Ionization energy decrease

Acid rain effects

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Human being

Crops

Aquatic life

All above

Setting of cement is improved by

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Lime stone

Clay

Gypsum

Water

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