Question # 1

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

Which of the following configurations corresponds to alkaline earth metals?

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[Ar] 3d10, 4s2

[Ne] 3d2, 3p2

[Ar] 4s2

[Ar], 3d10, 4s1

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

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Ge

Ar

Kr

He

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

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

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Oxygen

Silicon

Aluminium

Aluminates

Which of the following elements is most metallic

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Bi

sb

As

P

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

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

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

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 silica?

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Si2O3

SiO2

Si3O4

SiO-

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

Elements of group ll-A are called

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f-block elements

s-block elements

p-block elements

d-block elements

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

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 one of the following elements is most electropositive out of group I -A and II-A group?

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K

Mg

Na

Ca

The alkaline earth metals are called so because they

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form alkaline solution and are present in earth crust as minerals

form alkaline solution and are found in nature states

are present in earth crust

are present in earth crust as their minerals

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

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