Question # 1

------------- metal is used in the Thermite process because of its reactivity

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Tron

Copper

Aluminium

Zinc

Which one of the following elements exhibits s-inert pair effect.

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B

Al

Pb

Sc

In which compound, the oxidation state of boron in not +3

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H2BO3

Ca2B2O11

Na2B4O7

Mg3B2

Which one of the following compounds of lead is red in colour

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PbO

Pb2O

Pb3O4

PbCO3

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

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Silicon

Aluminium

Sodium

Oxygen

Aluminium oxide is.

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Acidic oxide

Basic oxide

Amphoteric oxide

None of these

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

The aqueous solution of Borax

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Acidic

alkaline

Amphoteric

manual

Boric acid cannot be used

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As antiseptic in medicine

For washing eyes

In soda bottles

For Enamals and Glazes

Tincal is a mineral of

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Al

C

Si

B

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

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 element forms on ion wiht charge 3+

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Beryllium

Aluminium

Carbon

silicon

Which is used in the leather industry

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Borax

Boric acid

Boric oxide

Tetra Boric acid

Which element burns in nitrogen atmosphere to form nitride.

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Mg

Al

Both a and b

None of these

Aluminum reacts with nitrogen to form

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AIN

Al₂N

Al₂N₃

Al₄N₆

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