Question # 1

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

Which of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

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

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Na

Sr

Cs

Rb

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

Which compound gives carbon when heated with conc. H2SO4.

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Starch

Ethyl alcohol

Oxalic acid

Formic acid

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

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

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

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Ge

Ar

Kr

He

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