Question # 1

About 25% of earth crust mass is made up of element

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Oxygen

Silicon

Aluminium

Aluminates

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 of the following belongs to alkaline earth metals

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Cu

Zn

Sn

Mg

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

What is the formula of magnesite?

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PbS

MgSO4. 7H2O

MgCO3

CaCO3

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

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

Elements of group IV-A are

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neither strongly electropositive nor strongly electronegative

strongly electropositive

strongly electronegative

none of these

How magnesium reacts with water?

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In frozen ice water

With cold water

In with steam

In hot state

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

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

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 ll-A are called

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f-block elements

s-block elements

p-block elements

d-block elements

One of the following metals is the most reactive and form super oxide. Indicate that

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Mg

K

Be

Li

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

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

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

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

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