Question # 1

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

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 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 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

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

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

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

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

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Rose quartz

Smokey quartz

Silica

Opal

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Which one of the following doesn't exhibit allotropy?

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Bi

As

N

P

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

Lithium differs from rest of members of its group due to which of following reasons

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High E.N of Li+1

Small radius

High charge density

All above are correct

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

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

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

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