Question # 1

Monomer of natural rubber is

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1,3-Butadiene

2-Methyl -1,3-butadiene

1,2 -Butadiene

1,3 - Pentadiene

Sulphate ores of aluminium

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Alumite

Cryolite

Fekdsper

Kaolin

Greeks and Romans had used nanoparticles in the manufacture of.

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Cosmetics for eyes

Medicines

Metals

Hair -dye

Compounds formed when noble gasses get entrapped in the cavities of crystal lattices of certain organic and inorganic compounds are called.

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Interstitial compounds

Hydrates

Clathrates

Picrates

The depolarizer used in dry cell batteries in.

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NH4Cl

MnO2

KOH

Na2PO4

Which of the following molecule does not contain the covalent bond between similar atoms.

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N2H4

F2O2

H2F2

H2O2

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

A salt solution is treated with chloroform drops.Then it is shaken with chlorine water, chloroform layer become violet solution contains.

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NO2 ion

NO3 ion

Br ion

I- ion

Which of the following methods is chemical in nature.

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Acid bas titration

Redox titration

Complexometric titration

All above methods

In the Lewis formula of which of the following species, the number of single double and dative bonds are equal

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N2O5

HNO3

SO2

SOCl2

Which of the following element is usually determined by flame photometry.

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Li

Na

K

All above elements

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware. etc. When mixed with cold con. H2SO4

The concept is also known as proton donor acceptor system.

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Bronsted Lowery

Lewis

Lux Flood

Usanovich

The hybridization of S in SO2 is.

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sp

sp2

sp3

dsp2

Organic substance responsible for the smell of flowers etc. are grouped together in chemistry as.

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Perfumes

Terpenoids

Flavonoids

Alkaloids

What does 'F' stand for in AFM.

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Fine

Front

Force

Flux

Covalent compound are soluble in

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Polar solvents

Non polar solvent

Concentrated acids

All solvent

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

Select the correct IUPAC nae for [Co(NH3)6 ]2+

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Hexammoniacobaltate (II) ion

Hexaamminecobaltate (II) ion

Hexammoniacobalt (II) ion

Hexaamminecobalt (II) ion

In second group of inorganic qualitative analysis, the S^2-ions does not form precipitate with which of the following ions.

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^Hg2+

Cu²⁺

Ai³⁺

Cd³⁺

Complexing reactions are useful for which of the following method of analysis

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Gravimetry

Spectrophotometry

Interfering ions masking

All of the above

The following statements are true except one which one.

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Carburizing does not harden a steel

Flame and induction hardening require the use of hard enable steels.

Quench –hardened steel does not require tempering to present brittleness

None of these

According to Usanovich concept a base is defined as any species.

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Capable of giving up anions

Combining with cations

Neutralizing an acid to give a salt

All of above

Graphite is a good conductor of electricity because is.

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Has sp2 hybridized carbon stoms

Has free electrons

Is crystalline

Has free atoms

Transition elements, in general, exhibit the following properties, except one, Name that property.

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Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

Which of the following does not form stable diatomic molecule.

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Nitrogen

Phosphorus

Hydrogen

Oxygen

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

An equilibrium the free energy change delta F for a reaction is.

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Maximum

Minimum

Zero

Negative

The conductance of 1 cm3 of an electrolytes solution is called its.

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Specific resistance

Specific conductance

Molar conductance

Equivalent conductance

Which statement is false.

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If a reaction is thermodynamically spontaneous it may occur rapidly

If a reaction is thermodynamically spontaneous it may occur slowly.

Activation energy is a kinetic quantity rather than a thermodynamic quantity.

If a reaction is thermodynamics spontaneous, it must have a low activation energy.

Metals are

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Transparent

Tranalucant

Opaque

None of above

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