Question # 1

The shape of SiO2 IS

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Tetrahedral

Trigonal bipyramid

Linear

Cubic

Ethyl alcohol on reacting with orthoboric acid form

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Ethyl borate

Boric acid

Boron acetate

Borax

Boric acid can not be used.

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As antiseptic in medicine

For washing eyes

In soda bottle

For enamels and glazes

A solution of borax in water is.

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Acidic

Alkaline

Neutral

None of these

Boron usually exist in nature as

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Borides

Oxborates

Free element

It is a artificial element

In which substance silicon is not present.

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Talc

Asbestos

Dolomite

Zirocon

Which electronic configuration corresponds to an element of group III-A of the Periodic Table

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1s²,2s²,2p⁶,3s²,3p¹

1s²,2s²,2p⁶,3s²,3p⁶,4s⁶

1s²,2s²,2p⁶

1s²,2s²,3s²,3p³

Which of the following elements is not present abundantly in earth's crust

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Silicon

Aluminium

Sodium

Oxygen

Which is not used of Borax

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Softening of water

As medicine for washing eyes

As flux in metallurgical operations

To make quartz

Corundum is

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Al2O3

Na2AlF6

Quartz

Calcium

Kaolin is a mineral of

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Carbon

Magnesium

Silicon

Aluminium

silicones are

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Some salts of sodium

Allotropes of SI

Inorganic polymers

Coloured compounds of Si

The chief of aluminum is

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Na₃AlF₆

Al₂O₃.2H₂O

Al₂O₃

Al₂O₃.H₂O

Which substances is called chrome yellow.

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Pb3O4

PbO

2PbCO3.Pb(OH)2

PbCrO4

Aluminium does not corrode because.

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It is a semi metal

It is a silver shining metal

It does not react with O2

It forms a protective layer of Al2O3

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