Question # 1

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 cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

What is the formula of dolomite?

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CaMg3 (SiO3)4

MgCO3

MgCO3.CaCO3,

MgSO4

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

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

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Ge

Ar

Kr

He

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

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

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

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Oxygen

Silicon

Aluminium

Aluminates

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

Which element of group V-A and VII-A does not use d-orbital?

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Nitrogen

Sulphur

Arsenic

Chlorine

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

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

Corrundam is ore of which element?

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Al

Th

In

Mg

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