Question # 1

Amorphous boron on burning in air form

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B(OH)3

Only B2O3

Only BN

Mixture of B2O3 and BN

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

The noble gas which was discovered first in the sun and then on the earth is.

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Helium

Neon

Argon

Xenon

Glass electrode cannot be used to measure the pH of pure.

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Acetic acid

Ethyl alcohol

Gelatin

All above

Mangalium is an alloy of.

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Al + Mg

Mg + Ai + Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

The law of trinds was proposed by

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Dobereiner

Newlands

Lother Mayer

Chancourtois

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

On the basic of CFT the bonding between the metal and ligand is totally

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Ionic

Covalent

Coordinate

Metallic

Black and white photographic film contain small grains of.

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Silver bromide

Silver cholride

Silver iodide

Any of above

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

Which number of halogen family does not show positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

Aluminium does not corrode as does iron because.

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AI does not react with O2

a-protective layer of Al2O3 forms on the metal surface

AI is harder to oxidize than is Fe

Fe gives chathodic protection to AI

Sodium reacts with excess of oxygen to form

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Na2O

NaO2

Na2O2

NaO

The value of Kw increase with temperature because the ionization of water.

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Positive

Negative

Endothermic

Exothermic

Which of the following impurities are present with the bauxite.

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Silica

Ferric oxide

Alumina

Both silica and ferric oxide

"Acids are substance whose aqueous solutions turned blue litmus red and tasted sour" stated by

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Davy

Liebig

Boyle

Rouelle

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

Which of the halogens has lowest bond energy.

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Cl2

Br2

F2

I2

Which of the following statements is correct.

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A sigma bond is weaker than a pi pond

There are four coordinate bonds in the Lewis structure of NH4+ ion.

The 1 covalent bond is directional in nature

A single bond between the two atoms cannot be re bond.

Which one of the following statement is incorrect in relation to ionization enthalpy.

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Ionization enthalpy increase for each successive electron

The greatest increase in ionization enthaly is experienced on removal of electron from core noble gas configuration

End of the valence electron is marked by a big jump in ionization enthalpy

Removal of electron from orbitals bearing lower value to easier than from orbital having highest n value.

What is the following is incorrect.

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Water is more polar than H2S

H2O2 is a planar molecule

Heavy water is produced by the exhauative electrolysis of water made acidic

H2O2 act both as oxidising as well as reducing agent in acidic medium

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