Question # 1

In the purification of bauxite , the ore is fused with sodium carbonate in the process

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Baeyer's process

Hall's process

Serpeck's process

Any of above

VBT is unable to explain the nature of some of the complexes of.

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Cobalt

Copper

Nickle

Manganese

In average composition of a good sample of cement the percentage of silica is.

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18.5%

20.5%

22.5%

24.5%

Increasing oxygen contents in oxyacids leads to.

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An increase in thermal stability

An increase in acid strength

A decrease in oxidizing power

All above

CFT was originally applied to.

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Ionic crystal

Liquid crystal

Solid crystal

All above

The maximum oxidation shown by managanese is.

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+2

+7

+4

+5

Which of the following statements false about transition metals.

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They form complexes

They show variable valency

All transiting metal compounds are paramagnetic

They form coloured ions

The formula of Bauxite is.

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Al2O3

Al2 O3. 2H2O

AL2O3, H2O

Na3AIF6

In XeF2 molecules, Xe atom undergoes hybridization

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spd

sp2

sp3

sp3d

What element is the most abundant by mass in the Earth's crust.

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Fe

H

O

K

Which of the following elements is most electropositive.

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C

N

O

Be

When calcium is heated in the flame of a Bunsen burner, the colour imparted to the flame is.

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Golden yellow

Brick red

Crimson red

Grassy green

Has maximum property of catenation.

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C

Si

Sn

Pb

The rising world temperature will have serious effect on.

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Agriculture

Animal production

Human being

All above

Which of the following statements correct regarding copper.

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It is used in electroplating

Its salts are used as insecticides

Its salts are used as coloring materials

All are correct

The correct order of ionization energies of alkali metals is.

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Li > Na > K > Rb

Na > K > Rb > Li

Rb > K > Na > Li

Rb > K > Li > Na

In smelting process the ore is mixed with

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Silica

Coke

Limestone

All

Sodium react more vigorously than lithium because.

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It is a metal

It has higher atomic mass

It is more electronegative

It is more electropositive

Which of the following is an allotrops of hydrogen.

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0- H2

P-H2

Both A and B

None of these

Stainless steel consists of which elements.

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Fe only

Cr only

Fe and Ni

Fe ,Ni and Cr

Which of the following does not form stable diatomic molecule.

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Nitrogen

Phosphorus

Hydrogen

Oxygen

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