Question # 1

Is a peroxy acid

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H2SO5

H2S2O6

H2SO4

H2S2O7

Which element are non metals.

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N & P

Sb & Bi

As & Sb

N & Bi

Ca2+ is isolelectronic with.

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Mg2+

Kr

Ar

Na+

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

Flourine differs from the other members of its own group due to.

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Its small size and low bond energy

Its higher electornegativity

None-availability of d-orbitals in its valence shell

All the above

The most stable oxidation state shown by lead is.

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+2 , +4

+2 only

+3 , +4

+4 only

Which of the following statements about anhydrous aluminium chloride is correct.

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It exist as AlCl3 molecules

It is not easily hydrolysed

It sublimes at 100 ^oC under vacuum

Boron does not form B³⁺ ions

The compound insoluble in acetic acid is.

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Calcium oxide

Calcium carbonate

Calcium oxalate

Calcium hydroxide

The inert gasses AR, Ka, and Xe form solid compounds with certain organic molecules under pressure..

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Halides

Hydrates

Clathrates

All of above

Which of the following is not a property of aluminium.

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An efficient electrical conductor

A low density compared to other metals

Is amphoteric

Toxic to humans

Law of octaves was proposed by

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Lother meyer

D.I.Mendeleev

J.A.R. Newlands

J.W. Dobereiner

Which can be purified by sublimation

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F2

Cl2

Be2

I2

The silicate chains are present in

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Silica

asbestos

Beryl

Clays

The basic strength of hydrides of group 15 elements very in the following order.

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NH3 > PH3 > AsH3 > SbH3 >BiH3

PH3 > NH3 > AsH3> SbH3 > BiH3

BiH3> NH3 >PH3 > AsH3 > SbH3

NH3 > PH3 > SbH3 > AsH3 > BiH3

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

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

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

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2 ,1

2,2

3,1

3,0

The formula of sulphur sequioxide

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SO4

S2O7

S2O3

SO3

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide or comentite

Graphite

Partly as iron carbide and partly as graphite

AlCl3 fumes in air because of.

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Hydrolysis

Dehydration

Hydration

Oxidation

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.

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