Question # 1

Elements of II-A group are called alkaline earth metals due to the reason that

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they occur in earth only

they form divalent cations only

they have ns2 electronic configuration

their oxides and hydroxides are alkaline in nature and metals are present in earth crust

Elements of group ll-A are called

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f-block elements

s-block elements

p-block elements

d-block elements

Corrundam is ore of which element?

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Al

Th

In

Mg

Which one of the following elements is not an alkali metal?

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Na

Sr

Cs

Rb

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

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

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

_{What is name of hydrated variety of quartz?}

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Rose quartz

Smokey quartz

Silica

Opal

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

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

One of the following metals is the most reactive and form super oxide. Indicate that

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Mg

K

Be

Li

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

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