Question # 1

Which of the following dye is used an antiseptic .

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Methyl orange

Mercurochrome

Alizarin

Bismarck brown

The number of significant figures in the number 0.216 is

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1

2

3

4

During the preparation of ethane by Kolbe's electrolytic method using inert electrodes the pH of the electrolyte.

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Increases progressively as the reaction proceeds

Decreases progressively as the reaction proceeds

Remains constant throughout the reaction

May decrease if the concentration of the electrolyte is not very high

Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called.

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Glass wool

Safety glass

Optical glass

Jena glass

In order to give strength and elasticity natural rubber is heated with.

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Sulphur

Oxygen

Nitrogen

Chlorine

Which of the following analytical technique is used for separating similar substance by preferential adsorption or partition between two phases.

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Distillation

Dialysis

Chromatography

Solvent extraction

What is the most common alloying ingredient in copper?

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Brass

Zinc

Cobalt

Nickle

AlCl3 fumes in air because of.

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Hydrolysis

Dehydration

Hydration

Oxidation

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

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KMnO4

H2SO4

CH3COOH

K2Cr2O7

Catenation is a process of.

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Formaton of cations

Deposition of cations

Formation of long chain of identical atoms

Formation of covalent bond

Example of intra molecular hydrogen bonding.

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O-nitrophenol

O-hydroxy benzaldehyde

O- hydroxy benzoic acid

All of the above

Oxidation state of the chromium [Cr(NH3)6]3+ complex ion is

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+2

+3

+4

+5

A considerable number of atoms pertaining to the surface_____ with the decreasing the particle size.

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Increase

Decrease

No effect

Both a and b

Alpha hematite nano tubes show dimensional magnetic ordering at temperature laser than 300 K.

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0

1

2

3

Which of the following reagent cannot be used to detect the phenolic group.

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Neutral FeCl3

I2/NaOH

NaOH solution

Br2/H2O

In the forth floatation process for the purification of ores, the ore particles float because.

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They are light

Their surface is not easily vetted by water

They bear electrostatic charge

They are insoluble

Al Cl3 is used in

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Manufacturing of petrol

In borax bead test

Prezervation of food

All above

Which of the following is not an ore of iron.

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Haematite

Magnetite

Siderite

Monazite

Which of the following responsible for depletion of ozone layer in upper strata of the atmosphere.

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Polyhalogens

Ferrocene

Freons

Fullerencs

Used in filling luminous tubes.

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Xenon

Krypton

Radon

Helium

Which of the following statement is not related to applications and limitations of first law of thermodynamics.

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This law explains why chemical reactions proceed to completion

It is silent about the source of heat

It is silent about the direction of heat

It does not tell us about the reversible process.

Which of the following characteristics of adsorption is wrong.

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Adsorptoin on solids is reversible in nature

Adsorption, in general increase with increase in temperature.

Adsorption is generally selective in nature.

Both enthalpy and entropy of adsorption are negative

Dyes which can be applied to cellulosic fibre from water solution are called.

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Ingrain dyes

Substantive dyes

Mordant dyes

Vat dyes

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

Which one of the following has the highest boiling point.

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H2O

H2S

H2Se

H2Te

Yellow green flame is observed with

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Calcium salt

Barium salt

Strontium salt

Sodium salt

The ionization potential of K would be numerically equal to.

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Electron affinity of Ar

Electromagnetically of K

Electron affinity of K+

ionization energy of Ca

In diborane (B2H6)

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The structure is similar to that of C2H6

All the atoms are in one plane

The born atoms are linked through hydrogen bridges

There is a direct boron boron bond

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.

The decomposition of dimethyl ether at 504 oC is first order with a half -life of 1570 second. What fraction of an initial amount of dimethyl ether remain after 47-10 seconds.

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1/3

1/6

1/8

1/16

Used for sterilizationof drinking water

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F

Br

Cl

I

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