Question # 1

Which of the following has the highest melting poing.

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NaCl

Li Cl

KCl

Rb Cl

Sodium reacts with excess of oxygen to form

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Na2O

NaO2

Na2O2

NaO

Phosphorus normally exhibit a covalency of.

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+1 and +2

+2 and +3

+3 and +4

+4 and +5

The bond order gives the following valuable information.

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Stability of the molecules of ions

Bond dissociation energy and bond length

Magnetic properties

All of the above

Beryllium shows diagonal relationship with.

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Mg

Al

Na

B

XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 ^oC

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1 : 3

5 :1

1 :20

1 :5

Which element amongst the following has the highest boiling point.

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Na

Mg

Ca

K

In each period, the most electropositive element belongs to group.

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18

17

1

2

Oxygen and sulphur exist in state

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Free

Combined

_{Both free & combined}

None of above

Aluminothermy used for on the spot welding of large iron structures is based upon the fact that.

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As compared to iron, aluminium has greatest affinity for oxygen.

As compared to aluminium, iron has greater affinity for oxygen

Reaction between aluminim and oxygen endothermic

Reaction between iron and oxygen is endothermic

Strong field ligands such as CN

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Usually produce high spin complexes and small crystal field splitting

Usually produce low spin complexes and small crystal field splitting

Usually produce low spin complexes and high crystal field splitting

Cannot form low spin complexes

Chlorine is used in

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Sterilizatin of water

Extractionof gold

Bleaching of cotton

All above

Oxides ores of Aluminium

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Corundum

Bauxite

Diaspore

All above

Both the elements shows allotropy

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B & Ai

B & Si

Al & Si

Any of above

The penultimate shells have pscudo inert gas type configuration.

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Ga

In

TI

All above

Neon is used in neon signs for advertising purpose because.

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Neon lights are visible from long distance

Neon light are visible though fog & mist

Both A and B

None of the above

Which name is associated with the rules which help in predicting the portability of anion.

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Soddy

Slater

Fajan

Linus pauling

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

Which show maximum number of oxidation states in 3d series.

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Mn

Ni

Co

Zn

Duralumin is an alloy of.

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Mg + AI

Ai+ Mg+Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

Which of the following elements has the highest ionization energy.

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Na

Si

Ar

Cl

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