Question # 1

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

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Alizarin

Tyrian purple

Indigotin

Quercitrin

Arrange the following in order of increasing boiling point.

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CH3OH < CH3Cl < RbCl < CH4

CHOH < CH4 < CH3Cl < RbCl

RbCl < CH3Cl < CH3OH < CH4

CH4 < CH3Cl < CH3OH < RbCl

Potassium sulphate with 48% to 52% potash, is made from.

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Potassium phosphate

Potassium Chloride

Potassium Nitrate

None of these

The units of coefficient of viscosity are.

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kg m-1 n-1

gm -1, s-1

kgm-1, min -1

None of the above

An ionic compound X + Y - is most likely to be formed if

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Ionization enthalpy of X is high electron gain ethalpy of Y is low

Ionization enthalpy of X is high electron gain enthalpy of Y is high

Ionization enthalpy of X is low,electron gain enthalpy of Y is low

Ionization enthalpy of X is low electron gain enthalpy of Y is high

Which of the following elements has the highest density.

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Mg

Na

K

Rb

Which of the following species is very poor oxidizing agent

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H+

Zn²⁺

Fe³⁺

MnO₄

Which of the following is a component of soap.

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Sodium sulphate

Sodium stearate

Sodium chloride

Sodium bromide

The rusting of iron is catalyzed by which of the following.

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Fe

H+

O2

Zn

Which of the following process is used for the removal of particulates.

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Wet removal by precipitation

Sedimentation

Diffusion and impaction

All above

Identify an oxygenated cyclic terpenoid

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a- pinene

Camphor

Citral

Geranial

Which of the following molecule contains two dative bonds according to Lewis structure.

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NH3

SO3

PCl5

BF3

Which of the following process is used for the removal of gases.

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Precipitation

Chemical reaction in the atmosphere

Absorption

All above

For the respiration of sea divers mixture is used.

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He & O2

Ar & O2

Ne & O2

Kr & O2

What ASTM test for compression is designated for plastics.

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D 638

D 695

D 790

D 732

The maximum oxidation shown by managanese is.

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+2

+7

+4

+5

Which of the following cells is used to produce electricity from chemical reaction

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Electroytic cell

Galvanic cell

Voltaic cell

Fuel cell

Both C and D

Who prepared and explained nano tubes for the first time.

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Sumio Tijima

Richard Smaley

Erick Drexler

Richard Feynamann

The correct order of electron affinities is.

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C > Si, > Na > Ar

Si > Cl > Na > Ar

C > Na > Si > Ar

C > Si > Ar > Na

Aluminium halides is.

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White crystalline solid

Hygroscopic

Sublimes at 180^oC

All above

Which of the following statements about anhydrous aluminium chloride is correct.

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It exist as AlCl3 molecules

It is not easily hydrolysed

It sublimes at 100 ^oC under vacuum

Boron does not form B³⁺ ions

Urea an enzyme used to estimate urea is a

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Hydrolytic enzyme

Oxidative enzyme

Reductive enzyme

Iso me rising enzyme

Which of the following statement is not correct n respect of Arrhenius concept.

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The concept is applicable only for aqueous systems.

Neutralization takes place in aqueous mediam only

TH+ ion cannot remain as such in water

This concept is applicable for non aqueous system only.

Which of the following chemical strong oxidizing agent is used in COD test.

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KMnO4

H2SO4

CH3COOH

K2Cr2O7

According to Fajns rules, which one of following results in increased ionic nature of the covalent bond.

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Larger cation and smaller charges on anion

Larger cation and larger charge on anion

Smaller cation and smaller charge on anion

Smaller cation and larger charge on anion

The ions Sc3+ , Ca2+ and K+ have same electronic configuration as that of.

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Neon

Argon

Krypton

Xenon

What is the equilibrium temperature of transformation of austenite to pearlite

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1000 F

1333 F

166 6 F

1222 F

Setting of plaster of Paris volves.

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Oxidation with atmospheric oxygen

Combination with atmosphere CO2

Dehydration

Hydration to yield another hydrate

Used in Geiger counter to detect radioactivity

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He

Ne

Ar

Kr

Alkyl cyanide and alkyl isocyanides are

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Tautomers

Metamers

Functional isomers

None of the above

The electronic configuration of chromium (Z =24) in the ground state is.

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[Ar] 4s² , 3d⁴

[Ar] 3d⁶

[Ar]4s¹, 3d⁵

[Ar]

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