Question # 1

The secondary valency of Conc. CoCl3. 6NH3.

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2

4

6

8

Identify a dye which was ot originally obtained from plant source.

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Alizarin

Tyrian purple

Indigotin

Quercitrin

Which of the following process is involved in getting back nitrogen into atomosphere.

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Nitrification

Denitricication

Ammonification

All above

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

Main constituent of all inorganic matter

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Carbon

Silicon

Tin

Lead

Which of the following to non -auditory effect of noise on human body.

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Changes in the Vascular tone

_{Increase in the blood pressure}

Wakening of the coloured vision

All above

Which of the following statement is not related with the effect of thermal pollution.

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Decrease in BOD

Increase in BOD

Reduction in DO

Change in algal production

The oxidation state of Pt in Xe+ [Pt F6] is

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+4

+5

+6

None of these

The physical methods of nano roads syntheses involves.

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Top down approach

Bottom up approach

Left right approach

Right left approach

According to SHAB, Lewis acid are divided into.

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Two classes

Three classes

Four classes

None of 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 first noble gas compound was

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XeO3

XeF4

XeF6

Xe +[PtF6]

What field of study encompasses procurement and production of metals.

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Metallurgy

Geology

Material science

Metalgraphy

In the Friedel-Craft acylation, the amount of AlCl3 tha tmust be taken is

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In catalytic amount

One equivalent

More then one equivalent

Amount does not matter

Which of the following effects best explains that o-nitro phenol is insoluble in water.

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Inductive effect

Resonance effect

Intramolecular H -bonding

Isomeric effect

Which of the following hydrocarbon cannot be obtained on reacting chloomethane with sodium metal in the presence of dry ether.

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C4 H10

C2H6

C2H4

C3H8

In Glass of vitreous state solid the atoms are arranged in.

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Regular fashion

Random fashion

linear fashion

All of these

Which of the following ahs non zero dipole moment.

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NH3

SF6

BF3

CO2

According to recent view which is the correct representation of hydrated proton in aqueous solutions.

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H+

H9O3+

H9O4+

H2O+

All the member of group III A are metals except.

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B

Ai

Ga

In

Which of the following does not have an a,b, unsaturated carbonyl group.

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Androsterone

Oestrone

Testosterone

Progesterone

Most electronegative element is.

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C

Si

Pb

Sn

Which of the following methods is chemical in nature.

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Acid bas titration

Redox titration

Complexometric titration

All above methods

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

The term 'brass' is very commonly used to designate any alloy primarily of.

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Copper and zinc

Aluminum and iron

Copper and aluminum

Zinc and nickel

Which of the following radical is not a member of II group.

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Cu²⁺

Cd²⁺

Ba³⁺

K+

In proper rotation (Cn) an object is rotated through an angle of.

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a/n radians

2n/n radians

3n/n radians

4n/n radians

Total pressure exerted by a mistress of two or more than two gases in a definite volume as any given temperature is equal to the sum of partial pressures which each gas would exert, if it occupied the same volume alone, at the same temperature This is a statement.

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Boyle's law

Charle's law

Graham's law

Dalton's law

Which of the following is not a characteristics of solids.

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Definite shape

Definite mass

Definite volume

Fluidity

Cryolite is used in the electrolytic extraction of aluminium to.

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Obtain more aluminium

Reduce alumina

Protective electrodes

Dissolve bauxite and increase the electrical conductivity

Select the major product obtained from the addition HBr to 1-methyl cyclohexene.

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1- bromo -2- methyl cyclohexane

6- bromo-1- methyl cyclohex - 1- ene

3- bromo-1- methyl cyclohex -1- ene

1- bromo-1- methyl cyclohexane

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