Question # 1

Which one of the following elements shows the most stable oxidation state of +1

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AI

Ga

In

TI

B.P of heavy water is

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equal to that of ordinary water

greater than that of ordinary water

Less than that of ordinary water

equal to that of distilled water

Mangalium is an alloy of.

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Al + Mg

Mg + Ai + Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

When Phosphate rock Ca3(PO4) 2 is converted to phosphorus.

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One of the products of the reaction is water

Sulphuric acid is added to generate insoluble calcium sulphate

Hydrogen is used to reduce the phosphate to phosphorus

Silica is added to form a calcium silicate slag

Which of the following alloys contains Cu and Zn

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Bronze

Brass

Gun metal

Type metal

Which of the following has the highest melting poing.

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NaCl

Li Cl

KCl

Rb Cl

Which of the following is not correct.

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Rusting of iron can be stopped by increasing the concentration of CO2 in water

Rusting of iron is electrochemical in nature.

Rusting of iron takes place in moist air

Rusting of iron produces hydrated iron (III) oxide

Carbon in wrought iron is present as

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Silicon carbide

Iron carbide cementite

Graphite

Partly as iron carbide and partly as graphite

Zeigler Natta catalyst is.

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Pt/PtO

TiCl4/Al(C2H5)3

Pt/Rh

Pt

The principal ores of copper are

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Copper sulphides

Copper oxides

Both sulphides and oxides

Copper carbonate

The atomic and ionic radii value on moving from left to right in the sereis.

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Increase

Decrease

Does not change

None of above

Ionic reactions mainly take place in.

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Aqueous solutions and organic solvents of high polarity

Non aqueous solvents of low polarity

Gaseous state

Solid state

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

Metal crystallize is system having co ordination number

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8

12

14

any one of above

Which of the following oxides is amphoteric..

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CaO

BaO

BeO

MgO

Which of the following statements is correct.

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A sigma bond is weaker than a pi pond

There are four coordinate bonds in the Lewis structure of NH4+ ion.

The 1 covalent bond is directional in nature

A single bond between the two atoms cannot be re bond.

In German Silver copper is alloyed with which metal.

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Zn

Ni

Ai

Zn and Ni

Which of the halogens has lowest bond energy.

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Cl2

Br2

F2

I2

Aluminum is an active metal but does not corrode as iron does because.

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Ai does not react with O2

A protective layer of Al2 O3 forms on the metal surface

AI is harder to Oxidize than is Fe

Aluminium has a high tensile strength

Amorphous boron on burning in air form

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B(OH)3

Only B2O3

Only BN

Mixture of B2O3 and BN

The geometry of Xe F2 is

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Triangular planar

Square planar

Linear

Trigonal bipyramidal

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