Question # 1

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

O2 molecule is.

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Fermagnetic

Forromagnetic

Paramagnetic

Diamagnetic

Which of the following impurities are present with the bauxite.

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Silica

Ferric oxide

Alumina

Both silica and ferric oxide

In each period the most electro negative element belongs to.

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^{Group -1}

Group -17

Group -2

Group -18

In whihc period, the element with least ionization enthalpy belong to

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Group I

Group 2

Group 17

Group 18

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

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Sulpher

Oxygen

Salenium

Both A and B

Which of the following property is not related to aluminum.

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it is silvery white metal with brilliant lusture

It is a very light metal with specific gravity as 2.7

It is good conductor of heat

It is the least reactive element of III Group.

Which of the following statements is not correct about noble gases.

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Their ionization energies are very high

Their electron affinities are nearly zero

They do not form any chemical compounds

They are not easily liquefied

AI Cl3 acts as a strong Lewis acid, because it is.

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A covalent compound

Readily hydrolyzed

Electron deficient

An ionic compound

In average composition of a good sample of cement the percentage of silica is.

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18.5%

20.5%

22.5%

24.5%

The formula of Tetraboric acid is.

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H2BO3

HBO2

H2B4O7

H6B4O9

Are used as water repellents

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Carbides

Silicon

Silicones

Silicates

Aluminium halides is.

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White crystalline solid

Hygroscopic

Sublimes at 180^oC

All above

The electronic configuration of some elements are given below. The element with highest electron affinity is

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1s2, 2s2, 2p3

1s2, 2s2, 2p4

1s2, 2s2, 2p5

1s2, 2s2, 2p6

Among LiCl, BeCl2, BCl3, and CCl4 the covalent bond character follows the order.

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LiCl < Becl2< Bcl3 < CCl4

LiCl > BeCl2 < BCl3<CCl4

LiCl< Becl2 < BCl3 < CCl4

LiCl > Becl2 > BCl3 < CCl4

Metal are generally elements

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Electronegative

Electropositive

Neutral

None of the above

Which of the following statement is not correct.

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The element with highest IE belongs to group 18

In each period the element with lowest IE belongs to group I

In each period the element with highest IE is a noble gas

In the second period as we move from left to right, ionization energy increases reqularly.

Of the molecules, SF4, XeF4, and CF which has square planar geometry.

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SF4, XeF4 and CF4

Sf4 only

CF4 only

XeF4

VBT does not edplain

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Absorption spectra

Color of transition metal ion

Heat of formation

All above

Which of the following molecule contains two dative bonds according to Lewis structure.

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NH3

SO3

PCl5

BF3

CFT can very well explain

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Color

Magnetic properties

Spectra of transition metal

All

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