Question # 1

Which of the following does not give flame test?

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Li

Ba

Mg

Sr

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

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

Corrundam is ore of which element?

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Al

Th

In

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

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

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

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Rose quartz

Smokey quartz

Silica

Opal

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

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