Question # 1

The process in which ore is heated generally in the absence of air, to expel water from a hydrated oxide at temperature below their melting points is called.

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calcination

Roasting

Froth floatation

Bessemerization

Group IV A consist of elements

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3

4

5

6

The common oxidation state of lanthanides is.

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+3

+2

+1

+4

Which of the following statements is incorrect.

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The elements of group 18 are known as aerogens.

Group 2 elements are all metals

Metallic character increase on going down a group

All the elements belonging to a particular period have same valence shell configuration.

Hydrogen at the moment of its generation is generally called.

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Protium

Nascent hydrogen

Atomic hydorgen

Heavy hydrogen

CFT can very well explain

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Color

Magnetic properties

Spectra of transition metal

All

Which of the following statements is not correct about noble gases.

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Their ionization energies are very high

Their electron affinities are nearly zero

They do not form any chemical compounds

They are not easily liquefied

Which of the following will exhibit variable electro Valency due to intert pair effect.

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Fe

Sn

K

Both Fe and Sn

The ionization potential of K would be numerically equal to.

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Electron affinity of Ar

Electromagnetically of K

Electron affinity of K+

ionization energy of Ca

The silicate chains are present in

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Silica

asbestos

Beryl

Clays

Ionic bond are also forces called as.

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Polar bond

Electrovalent bond

None polar bond

Both A and B

Iodine is a grey black solid and its vapours are in color

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Grey

Black

Yellow

Violet

The process requirieng the absorption of energy of.

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F = F

Cl = Cl

H = H

O = O

Zero group of the periodic table consists of.

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Four elements

Five elements

Six elements

Eight elements

Arrange the hydrides group 15 in the order of increasing boiling point.

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PH3 < AsH3 <SbH3 < BiH3 <NH3

PH3 <AsH3< SbH3< NH3 < BiH3

PH3 < AsH3<NH3 <SbH3<BiH3

NH3 < PH3 < AsH3 < Sb H3 < BiH3

The correct order of second ionization potential of carbon nitrogen, oxygen and fluorine is.

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C > N > O > F

O > F > N > C

O > N > F > C

F > O > N > C

The specific gravity of H2SO4 is

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1.37

1.84

1.17

1.57

In manufacturing of cement crystallization of amorphous dehydration products of clay

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500 ^oC to 800 ^oC

900 ^oC to 1200^oC

1250 ^oC ti 1400 ^oC

1000 to 1100 ^oC

Mangalium is an alloy of.

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Al + Mg

Mg + Ai + Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

Which of the following has the greatest metallic character.

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Na

Mg

Al

Si

Among the solvents given below, with dielectric constant (E) given in parentheses which has highest solubility of KCI?

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Benzene (E=O)

Carbon disulphide (E = O)

Methanol (E =32)

Acetone (E = 2)

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