Question # 1

The electromagevitiy of the following elements increase in the order

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F > Cl > O > S

S > Cl > O > F

F > O > N > C

C > O > N > F

Which one of the following noble gas is obtained by radioactive disintegrastion

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Kr

Br

Rn

Xe

HCIO evolves Cl2 and O2 when dissolve

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Ca

Ni

Cu

Any of above

Which of the following molecule does not contain the covalent bond between similar atoms.

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N2H4

F2O2

H2F2

H2O2

The correct order of second ionization potential of carbon nitrogen, oxygen and fluorine is.

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C > N > O > F

O > F > N > C

O > N > F > C

F > O > N > C

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

In the electrolysis of alumina, cryolite is added to.

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Lower the melting point of alumina

Increase the electric la conductivity

Minize anodize affect

Remove impurites from alumina

H2SO4 is used

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In the preparation of aqua regia

In the purification of gold and silver

In the dental filling

None of above

Which one of the following ions is colourless.

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Cu+

Co2+

Ni2+

Fe3+

Are used as water repellents

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Carbides

Silicon

Silicones

Silicates

Sodium silicate is ued

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In fire proofing of wood and textiles

As a preservative of eggs

As a furniture polish

All above

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

The process requirieng the absorption of energy of.

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F = F

Cl = Cl

H = H

O = O

Molecules have zero dipole moment

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CO2

BCl3

CH4 & CCl4

All above

All the halogen form oxyacide, except

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Florine

Chlorine

Bromine

Iodine

In which pair of species, the Lewis formula contain same number of Lone pairs and bond pairs but they are not iso electronci.

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O2 B2

SO2, O3

PCl3, BF3

SOCl2, COCl2

The metallic character of group 14 elements

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Decreases from top to bottom

Increases from top to bottom

Does not change gradully

Has no significance

Colour in transition metal compounds in attributed to

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Small sized metal ions

Absorption of light in UV region

Complete ns sub shell

incomplete (n-1) sub shell

The process in which ore is heated generally in the absence of air, to expel water from a hydrated oxide at temperature below their melting points is called.

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calcination

Roasting

Froth floatation

Bessemerization

An element having low IE and low EA is likely to belong to.

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Group IA

Group IB

Group VII A

Group VIII

Boron does not form B3+ ion because.

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It has small size and high ionization energy

It has high electromagnetically

It has high charge density

None of the above

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