Question # 1

Chemical composition of colemanite is

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Ca₂B₆O₁₁. 5H₂O

CaB₄O₇. 4H₂O

Na₂B₄O₇.4H₂O

CaNaB₅O₉. 8H₂O

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

Which substances is called chrome yellow.

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Pb3O4

PbO

2PbCO3.Pb(OH)2

PbCrO4

Which one of following is used in cosmetics

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Talc

Asbestos

Sodium sulphate

Aluminium Sulphate

The aqueous solution of Borax

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Acidic

alkaline

Amphoteric

manual

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

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Silicon

Aluminium

Sodium

Oxygen

Lead monoxide is

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Amphoteric

Neutral

Acidid

Basic

Boron usually exist in nature as

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Borides

Oxborates

Free element

It is a artificial element

Which element form an ion with charge +3

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Beryllium

Aluminum

Carbon

Sillicon

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

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PbO

Pb2O

Pb3O4

PbCO3

Ethyl alcohol on reacting with orthoboric acid form

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Ethyl borate

Boric acid

Boron acetate

Borax

Which metal is used in the thermite process because of its activity.

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Iron

Copper

Aluminium

Zinc

Which one of the followings is not ore of aluminium

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Coruridum

Bauxite

Colemanite

Kaolin

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

The composition of white lead is

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PbCO3.Ph(OH)2

PbCO3.2Pb(OH)2

2PbCO3.Pb(OH)2

PbCO3

Al reacts with caustic soda to form

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Sodium aluminates

Aluminium hydroxide

Aluminium oxide

sodium tetra aluminate

Which element forms on ion wiht charge 3+

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Beryllium

Aluminium

Carbon

silicon

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

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Tron

Copper

Aluminium

Zinc

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