Question # 1

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

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

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

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 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 of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

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

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Ge

Ar

Kr

He

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

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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