Question # 1

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

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Silicon

Aluminium

Sodium

Oxygen

Al reacts with caustic soda to form

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Sodium aluminates

Aluminium hydroxide

Aluminium oxide

sodium tetra aluminate

The aqueous solution of Borax

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Acidic

alkaline

Amphoteric

manual

Which one of the followings is not ore of aluminium

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Coruridum

Bauxite

Colemanite

Kaolin

Aluminum reacts with nitrogen to form

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AIN

Al₂N

Al₂N₃

Al₄N₆

Aluminium is used for making petrol and milk storage tanks because it is

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Conductor

Non magnetic

Excellent reflected

Corrosion resistant

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

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

Which are correct oxidation states for lead

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+1, +2

+3 , +5

+2 ,+4

+4 only

silicones are

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Some salts of sodium

Allotropes of SI

Inorganic polymers

Coloured compounds of Si

Corundum is

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Al2O3

Na2AlF6

Quartz

Calcium

The composition of white lead is

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PbCO3.Ph(OH)2

PbCO3.2Pb(OH)2

2PbCO3.Pb(OH)2

PbCO3

Boron usually exist in nature as

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Borides

Oxborates

Free element

It is a artificial element

Which element burns in nitrogen atmosphere to form nitride.

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Mg

Al

Both a and b

None of these

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