Question # 1

The one in which the acceptor atom is of low positive charge, Large size and has several outer electrons which can be easily excited is a.

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Soft base

Hard Base

Soft acid

Hard acid

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide or comentite

Graphite

Partly as iron carbide and partly as graphite

Group III A of the periodic table consist of elemetns.

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3

4

5

6

The major role of Flurospar which is added in small quantities in the electrolytic reduction alumina dissolved in fused cryolite is.

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As a catalyst

To make the fused mixture very conducting

To lower the temperature of the melt

To decreases the rate of oxidation of carbon at the anode

Arrange the hydrides of group 15 in the correct order of reducing nature.

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NH3 < PH3 < AsH3 < Sb H3 < BiH3

NH3 > PH3 >AsH3 >Sb H3 > BiH3

PH3 < AsH3 < SbH3 < BiH3 < NH3

PH3 > AsH3 > SbH3 > BiH3 > NH3

Bryllium salts on hydrolysis give.

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Basic solutions

Acidic solutions

Neutral solutions

Amphoteric solutions.

The 'shape' of molecule ." Xe F6 is.

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Pentagonal bipyramidal

Regular octahedral

Distorted octahedral

Square planar

Which one of following is paramagnetic and has the bond order equal to 0.57

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N2

H2+

O2

F2

Magnalium is alloy of Aluminium which is used in

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Scientific apparatus

Aircraft parts

Rail road care

Boat machinery

Are used as water repellents

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Carbides

Silicon

Silicones

Silicates

Which of the following alkaline earth metals occurs in radioactive form in nature.

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Ca

Mg

Ra

Ba

The inert gases Ar, Kr and Ke form compounds with water at low temperature and high pressure. These compounds are called.

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Halides

Hydrates

Clathrates

All of above

Transition elements, in general exhibit the following properties, except one Name that property.

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Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

In which of the following characteristics does hydrogen resemble halogens.

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Hydrogen is the lightest gas

H atoms contains one electron each

Hydrogen forms ionic hydrides with alkali metals

Hydrogen has three isotopes.

Xenon reacts best with

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The most electropositive elements

The most electronegative elements

The hydrogen halides

Non metals

The most important conditions for the formation of ionic bond are.

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High ionization energy of the metallic atom and high electron affinity of the non metallic atom.

Low ionization of the metallic atom and low electron affinity of the non metallic atom.

Low ionization energy of metallic atom and high electron affinity of the non metallic atom

High ionization energy of the metallic atom and high electron affinity of non metallic atom.

In 1952 who popularized the use of CFT for inorganic chemist

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Bethe

Orge

Van Vleck

Werner

Which of the following metals is the most abundant in the earth's crust.

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Mg

Ca

K

Na

Metal crystallize is system having co ordination number

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8

12

14

any one of above

The noble gases which does not I do not form any clathrates is.

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He

Ne

Argpm

Both He and Ne

Which of the following hydroxide is amphoteric.

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B(OH)3

Al(OH)3

Ga (OH)3

In (OH)3

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