Question # 1

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

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 of the following configurations corresponds to alkaline earth metals?

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[Ar] 3d10, 4s2

[Ne] 3d2, 3p2

[Ar] 4s2

[Ar], 3d10, 4s1

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

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

Asbestos is commonly used in making

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wall board

black board

soft board

hard board

Fluorine is largely used in

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rocket fuels

making Teflon

making freon

All

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

Elements of group IV-A are

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neither strongly electropositive nor strongly electronegative

strongly electropositive

strongly electronegative

none of these

Which of the following does not give flame test?

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Li

Ba

Mg

Sr

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

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 the least reactive of all the alkali metals

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Li

Na

K

Cs

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

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

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

What is the formula of clay?

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Asbestos

Talc

H2Al2(SiO4)2.H2O

Na2SiO3

Which one of following property is not true about alkali metals?

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Strongest bases due to their hydrides

Low ionization energy

Oxidation number more than +1

Form acidic oxides

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

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