Question # 1

Which of the following elements has the highest ionization energy.

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Na

Si

Ar

Cl

Strength of H bond in inter mediate between

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Van der Waals forces and covalent bond

Ionic and covalent bond

Ionic and metallic bond

Metallic and covalent

Which of the following statements is not true about potash alum.

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Its empirical formula is KAI (SO4)2 12H2O

Its aqueous solution is basic in nature

It is used in dyeing industry

On heating it melts in its water of crystallization

The size of iso electronic species - F- , Ne, and Na+ is affected by

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Nuclear charge (Z)

Valence principal quantum number (n)

Electron electron interaction in the outer orbital

None of the factors because their size to the same.

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

Al2Cl6 is an example of

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Ionic bond

Covalent bond

Co ordinate bond

Metallic bond

An electron has types of motion

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Spin motion

Orbital motion

Both A and B

None of above

Which of the following elements has the highest density.

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Mg

Na

K

Rb

Titanium dioxide shows the lattice strcuture.

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Flluorite

Rutile

Wurtzite

Zeolite

How many sigma and pi bonds are there in a CO2 molecule.

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2 sigma

2 sigma and 4 pi

2 sigma and 2 pi

4 sigma and no pi

Chlorine is used in

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Sterilizatin of water

Extractionof gold

Bleaching of cotton

All above

Covalent compound are soluble in

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Polar solvents

Non polar solvent

Concentrated acids

All solvent

The energy gap between two bands so large that it effectively prevents the promotion of electron from the lower to the higher band such energy gap all called.

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Ionization zone

Dissociation zone

Distinction zone

Forbidden zone

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

The correct order of electron affinities is.

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C > Si, > Na > Ar

Si > Cl > Na > Ar

C > Na > Si > Ar

C > Si > Ar > Na

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

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Mn

Ni

Co

Zn

Aluminium is used for.

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Making ultensile & framea

Making alloys

Reducing agent

All above

iodine is used as

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Tincture of iodine

Iodex and antiseptic

Treatment of goiter

All above

Which of the following elements is most electropositive.

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C

N

O

Be

Which among the following is insoluble in water.

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LiOH

KOH

NaOH

RbOH

Molten iron withdrawn from the blast furnace is called.

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Wrought iron

Pig iron

Bessemer iron

Stainless steel

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