Question # 1

The Hall process involves the reduction of Al2O3 to aluminium by

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Carbon

Carbon monoxide

Molecular hydrogen

Electrolysis

The noble gases are found in the atmosphere to the extent of about some percent by volume.

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0.5%

1.0%

1.5%

2.0%

Acid rain effects

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Human being

Crops

Aquatic life

All above

Which of the following compound does not following octet rule.

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CS2

PBr3

IBr

Br F3

Dry ice is

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Solid CO

Solid CO2

Solid NH3

Solid SO2

The compound which does not act as Lewis acid is.

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BF3

AlCl3

BeCl2

SnCl4

B.P of heavy water is

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equal to that of ordinary water

greater than that of ordinary water

Less than that of ordinary water

equal to that of distilled water

Which librates H2 with NaOH

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B

AI

Zn

All

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

Type of hybrid orbitals used by the chlroine atom in CIO2 is.

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sp2

sp3

sp

None of these

In the forth floatation process for the purification of ores, the ore particles float because.

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They are light

Their surface is not easily vetted by water

They bear electrostatic charge

They are insoluble

O2 molecule is.

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Fermagnetic

Forromagnetic

Paramagnetic

Diamagnetic

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.

The attraction which exists between carbon dioxide molecules in solid carbon dioxide is due to.

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Van der Waal's forces

Molecule ion forces

ionic bonds

hydrogen bonds

Nitric acid is used in the manufacturing of.

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Dyes

Drugs

Artificial silk

All above

The most important conditions for the formation of ionic bond are.

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High ionization energy of the metallic atom and high electron affinity of the non metallic atom.

Low ionization of the metallic atom and low electron affinity of the non metallic atom.

Low ionization energy of metallic atom and high electron affinity of the non metallic atom

High ionization energy of the metallic atom and high electron affinity of non metallic atom.

Metal crystallize is system having co ordination number

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8

12

14

any one of above

Ca H2 on reaction with water liberates

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H2

O2

Botha of these

None of these

VBT is unable to explain the nature of some of the complexes of.

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Cobalt

Copper

Nickle

Manganese

The most abundant metal in earth's crust is.

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Fe

Al

Ti

Ca

Law of octaves was proposed by

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Lother meyer

D.I.Mendeleev

J.A.R. Newlands

J.W. Dobereiner

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