Question # 1

What is the formula of bauxite?

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Al2O3.2H2O

Al2O3

Na2B4O7 .10 H2O

Ca2B6O11. 5H2O

Which of the following are not known to form compounds in more than one oxidation state?

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Transition metals

Halogens

Alkali metals

Noble gases

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

Corrundam is ore of which element?

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Al

Th

In

Mg

What is the formula of clay?

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Asbestos

Talc

H2Al2(SiO4)2.H2O

Na2SiO3

Which of the following elements is most metallic

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Bi

sb

As

P

What is the formula of dolomite?

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CaMg3 (SiO3)4

MgCO3

MgCO3.CaCO3,

MgSO4

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

About 25% of earth crust mass is made up of element

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Oxygen

Silicon

Aluminium

Aluminates

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

Which noble gas is used in mixture used for breathing by divers?

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Ge

Ar

Kr

He

Beryllium differs from other elements of group Il-A due to

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high charge density

comparatively high nuclear charge

small radius

all above

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

Which of the following does not give flame test?

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Li

Ba

Mg

Sr

Which one of the following doesn't exhibit allotropy?

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Bi

As

N

P

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

What is the formula of magnesite?

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PbS

MgSO4. 7H2O

MgCO3

CaCO3

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