Question # 1

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

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Rose quartz

Smokey quartz

Silica

Opal

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

Corrundam is ore of which element?

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Al

Th

In

Mg

What is the formula of bauxite?

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Al2O3.2H2O

Al2O3

Na2B4O7 .10 H2O

Ca2B6O11. 5H2O

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

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

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

What is the formula of magnesite?

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PbS

MgSO4. 7H2O

MgCO3

CaCO3

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

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

Which of the following element has high m.p and b.p, it acts as a reducing agent, and can react with bases?

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Sr

Ca

Be

Mg

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

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Ge

Ar

Kr

He

One of the following does not give the flame test. Which is that

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Sr

Bа

Be

Na

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

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Mg

K

Be

Li

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

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

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Na

Sr

Cs

Rb

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

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

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

Elements of group IV-A are

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neither strongly electropositive nor strongly electronegative

strongly electropositive

strongly electronegative

none of these

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