Question # 1

The aqueous solution of Borax

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Acidic

alkaline

Amphoteric

manual

Third abundant element on earth crust is.

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Boron

Oxygen

Aluminium

Silicon

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

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Tron

Copper

Aluminium

Zinc

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

Aluminum reacts with nitrogen to form

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AIN

Al₂N

Al₂N₃

Al₄N₆

Which substance is water repellant and used in ceramic insulators.

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Asbestos

Lead compounds

Silicon carbide

silicones

Which element burns in nitrogen atmosphere to form nitride.

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Mg

Al

Both a and b

None of these

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

Lead monoxide is

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Amphoteric

Neutral

Acidid

Basic

Which are correct oxidation states for lead

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+1, +2

+3 , +5

+2 ,+4

+4 only

Chemical composition of colemanite is

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Ca₂B₆O₁₁. 5H₂O

CaB₄O₇. 4H₂O

Na₂B₄O₇.4H₂O

CaNaB₅O₉. 8H₂O

Boric acid is used as eye wash due to its

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Weakly acidic property

Antiseptic nature

Antibiotic nature

Weakly basic properties

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

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Silicon

Aluminium

Sodium

Oxygen

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

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Conductor

Non magnetic

Excellent reflected

Corrosion resistant

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

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Iron

Copper

Aluminium

Zinc

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

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H2BO3

Ca2B2O11

Na2B4O7

Mg3B2

The composition of white lead is

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PbCO3.Ph(OH)2

PbCO3.2Pb(OH)2

2PbCO3.Pb(OH)2

PbCO3

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