Question # 1

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

Which of the following process is not involved in the purification of bauxite.

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Bayer's process

Serpek's process

Hall's process

Goldsmith's process

The decreasing order of the second ionization energies of K, Ca and Ba is

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K > Ca > Ba

Ca > Ba > K

Ba > K > Ca

K > Ba > Ca

The wire of flash bulb is made up of.

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Cu

Ag

Mg

Ba

Which of the following gas is lightest.

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Dihydrogen

Helium

Dinitrogen

Dioxygen

A thionic acid

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H2S2O3

H2S2O6

H2S2O8

H2S2O7

Lewis concept explain the formation of

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Ionic bond

Covalent bond

Co-ordinate bond

Chemical bond

Most electronegative element is.

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C

Si

Pb

Sn

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

Stainless steel contains

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Fe+Cr+Ni

Fe+Ni+Cu

Fe + Cr+ Cu

Cu + C + Ni

Which of the following is not a property of aluminium.

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An efficient electrical conductor

A low density compared to other metals

Is amphoteric

Toxic to humans

The formula of hexa borane is.

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B4H10

B6 H10

B5 H9

B8 H12

Group III A of the periodic table consist of elemetns.

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3

4

5

6

Nitrogen (N2)) is relatively unreactive because.

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Its electronegativity is high

Its dissociation energy is large

Its atomic radius is small

It is the first element of group 15

Which of the following ions does not have the electronic configuration same as that of neon.

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F-

O2-

Na+

Ca2+

By applying an external force the ionic solid can be easily broken to powder form so the ionic solid are highly

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Hard

Brittle

Tough

Soft

Which is the second most abundant element occurring the earth crust.

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Iron

Cu

Cr

Ni

In the forth floatation process for the purification of ores, the ore particles float because.

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They are light

Their surface is not easily vetted by water

They bear electrostatic charge

They are insoluble

Excluding H-atom , Hydrogen bond never involves more than atoms.

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One

Two

Three

Four

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

Magnalium is alloy of Aluminium which is used in

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Scientific apparatus

Aircraft parts

Rail road care

Boat machinery

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

Pick out the ideal conditions needed for the manufacture of H2SO4 by contact process.

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Low temperature high pressure and high concentration of reactants

Low temperature , low concentration of reactants and low pressure

High temperature high pressure and high concentration of reactants

Low temperature, low pressure and high concentration of reactants.

The pH of the 1.3 x 10^-4 NH₄Cl is

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1.3

4.0

2.886

3.886

Which of the following configuration is associated with biggest jump between second and third IE.

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1s2, 2s2, 2p2

1s2, 2s2, 2p6, 3s1

1s2,2s2,2p6, 3s2

1s2, 2s2,2p6

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