Question # 1

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

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

Which compound gives carbon when heated with conc. H2SO4.

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Starch

Ethyl alcohol

Oxalic acid

Formic acid

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

Which of the following are not known to form compounds in more than one oxidation state?

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Transition metals

Halogens

Alkali metals

Noble gases

Which one of the following doesn't exhibit allotropy?

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Bi

As

N

P

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

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

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

What is the formula of clay?

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Asbestos

Talc

H2Al2(SiO4)2.H2O

Na2SiO3

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

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

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Rose quartz

Smokey quartz

Silica

Opal

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

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 reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

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