Question # 1

An ionic compound X + Y - is most likely to be formed if

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Ionization enthalpy of X is high electron gain ethalpy of Y is low

Ionization enthalpy of X is high electron gain enthalpy of Y is high

Ionization enthalpy of X is low,electron gain enthalpy of Y is low

Ionization enthalpy of X is low electron gain enthalpy of Y is high

Which of the halogens has lowest bond energy.

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Cl2

Br2

F2

I2

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

Metallic bond is treated essentially as in character

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Ionic

Covalent

Polar

Non polar

Electronegativity is given by

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Average of first and second ionization energies.

Average of first and second electron affinites

Average of ionization energy and electron affinity

None of the above

Law of octaves was proposed by

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Lother meyer

D.I.Mendeleev

J.A.R. Newlands

J.W. Dobereiner

Zero group elements are called as

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Inert gases

Rare gases

Noble gases

All of above

Hydrolith is the common name of

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NaH

CaH2

NaF

CaF2

The specific gravity of H2SO4 is

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1.37

1.84

1.17

1.57

Which of the following element has six electrons in the valence shell but cannot exhibit a maximum co valency of six.

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Sulphur

Oxygen

Selenium

Both A and B

When 0.01 moles of NaOH are added to a buffer solution, its pH changes from 4.745 to 4.832 WHAT IS ITS.

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0.115

0.900

0.015

0.215

Which of the following is a false statement.

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Halogens are strong oxidizing agent

Halogens show only (-I) Oxidation state

Hf molecules from intermolecular H-Bonds

Fluorine is highly reactive

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

Zinc oxide is.

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A basic oxide

An amphoteric oxide

An acidic oxide

A neutral oxide

BCl3 is a planar molecule because B atom is.

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sp2 hybridized

Sp3 hybridized

sp hybridzed

sp3 d hybridized

The formula of hexa borane is.

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B4H10

B6 H10

B5 H9

B8 H12

Which of the following metals form volatile carboyl with CO below 80^oC

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Cu

Fe

CO

Ni

Which of the following oxides is amphoteric..

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CaO

BaO

BeO

MgO

Which of the following species have undistributed octahedral structure.

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SF6

PF6

Si F₆^2-

XeF6

Select the correct IUPAC nae for [Co(NH3)6 ]2+

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Hexammoniacobaltate (II) ion

Hexaamminecobaltate (II) ion

Hexammoniacobalt (II) ion

Hexaamminecobalt (II) ion

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