Question # 1

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

Elements in the same vertical group of the periodical have same

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Number of electron

Atomic number

Number of valence elections

Electronic configuration

Which of the following techniques is used to reduce the need for large volumes of organic solvents.

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Solid phase extraction

Gel permeation

Electrophoresis

TLC

One arm of each t-RNA terminates in the base sequence.

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UGU

GGC

ACT

CCA

The ion that is isoelectornic with CO is

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CN-

O2+

CO2-

N2+

Sanger's reagent is

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Carbobenzyloxy chlride

Dimethyl amino sulphonyl chloride

I-Fluoro -2,4-dinitrobnzene

2,4- Dinitrophenyl hydrazine

The chief ore of aluminium is.

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Cryolite

Bauxite

Kaolin

Carnalite

Permanent hardness of water is due to.

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Sulphate of Ca

Chloride of Ca

Sulphate of Mg

All above

Which of the following statement is not correct with respect to hydrolytic cycle.

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It is the major constituent of the lithosphere

it is essential requirement of all the organisms

Water covers about 83% of the earth's surface

Water covers about 73% of the ear5th's surface.

Molten iron withdrawn from the blast furnace is called.

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Wrought iron

Pig iron

Bessemer iron

Stainless steel

The co ordination number of atoms in a hexagonal closed packed structure is

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2

6

12

4

Ferrochrum contains Cr up to

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60-70%

70-80%

80-90%

40-50%

Cement is a mixture of

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Clay and clinker

Clay limestone and gypsum

Limestone and gypsum

Binder

The correct order of reactivity among I , Ii, and III IS.

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i > ii >iii

i > iii > ii

II > III > I

III > II > I

In normal mode of operations of liquid liquid partition, a polar stationary phase is used with a non polar mobile phase Which of the following solvent is used as mobile phase.

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Ethanol

Propanol

Butanol

Hexane

Which of the following elements has the highest melting point.

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Magnesium

Calcium

Strontium

Berylliium

The boiling point of water is unexpectedly high because.

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H2O molecule in linear

Sp3 hydrogen bonding is involved in the formation of water

There is hydrogen bonding and consequent association of H2O molecules.

Oxygen is the first member of the VI group

Which of the following oxides is amphoteric..

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CaO

BaO

BeO

MgO

Among the following a good solvent for a Grignard reagent formation would be.

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t- butanol

dimethyl ether

difiuoro ethane

tetrahyudroform

When two bodies have equality of temperature with a 3rd body they in turn have equality of temperature with each other. This is a statement of.

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First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

In the extraction of iron, the furnace change consists of iron ore, coke and limestone. The function of limestone is to act as.

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An oxidizing agent

A reducing agent

Flux

Slag

Cobalt salt imparts which colour to the borax bead

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Blue

Green

Red

Yellow

In which polymer the strength of inter molecular forces is maximum

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Elastomers

Thermoplastic

Fibre

Cross linked polymer

Strong field ligands such as CN

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Usually produce high spin complexes and small crystal field splitting

Usually produce low spin complexes and small crystal field splitting

Usually produce low spin complexes and high crystal field splitting

Cannot form low spin complexes

Which of the following are anionic detergents.

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Sodium salts of sulfonated long chain alcohol

Ester of stearic acid and polythlene glycol

Quaternary ammonium salt of amine with acetate ion

Sodium salts of sulfonated long chain hydrocarbons

Which one of the following ions is colourless.

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Cu+

Co2+

Ni2+

Fe3+

The most promising technique for solar production of electricity is.

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Dry cell

Battery

Solar cell

None of above

Which of the following elements with excess oxygen to form proxides.

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Ca

Mg

Li

Ba

The element with the highest first ionization potential is.

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Boron

Carbon

Nitrogen

Oxygen

An induction of dipole or polarity in non polar bond, and consequent electron shifting along a chain of atoms is known as.

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Inductive effect

Resonance effect

Hyper conjugation

None of the above

All the strong acids have very close pKas value and they appear to have nearly equal strengths in aqueous solutions. The phenomenon is called as.

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Levelling effect

Differnetiating effect

Levelling solvent

Differnetiating solvent

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