Question # 1

Which of the following gas is lightest.

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Dihydrogen

Helium

Dinitrogen

Dioxygen

What is the purpose of molybdenum in steel alloying.

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To increase dynamic and high temperature strength and hardness

To increase brittleness

To increase corrosion and resistance

All above

Which type of organic compounds does fat belong to.

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Alkene

Ester

Alkanol

Alkanoic acid

The first step of formation of sugar is

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Extraction

Washing

Cutting

Clarifying

Which of the following salt is water insoluble.

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K2SO4

Na2SO4

BaSO4

None of abvoe

The relative error is usually expressed as

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Parts per ten

Parts per one

Parts per hundred

Botha C and D

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

Which of the following statements is false about transition metals.

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They form complexes

They show variable valency

All transition metal compounds are paramagnetic

They form coloured ions

In which polymer the strength of inter molecular forces is maximum

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Elastomers

Thermoplastic

Fibre

Cross linked polymer

The quantum yield of a Photo chemical reaction in

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Always less than unity

Always equal to unity

Always greater than unity

Can have any value > 0 depending on the reaction

Which of the following statement is not related to MOT

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Atomic orbitals lose their identities

MOTgives as idea of denationalization

MOT uses all the orbitals and elections

It treated bond as purely covalent

Which of the following detector is used in GC analysis

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Thermal conductivity detector

Flame ionization detector

Mass spectrometer

All above

Which of the following molecules have centre of symmetry.

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H2O

HCl

CO2

H2SO4

Indicate false statement about stainless steel

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The density of stainless steel is about the same as carbon or low alloy steels

Stainless steels are poor conductors of heat

Stainless steels are poor conductors of electricity

Stainless steels have tensile moduli greater than those of carbon and alloy steels.

Ozone is stratosphere is depleted by

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CF2Cl2

C7F16

C6H6Cl6

C6F6

D(+) glyceraldebydes has the absolute configurtion.

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E-

S-

E-

Z-

Ionic reactions mainly take place in.

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Aqueous solutions and organic solvents of high polarity

Non aqueous solvents of low polarity

Gaseous state

Solid state

The deficiency of which vitamin leads to beri brainteaser

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Thiamine

Riboflavin

Pyridoxine

Asorbic acid

Alkyl cyanide and alkyl isocyanides are

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Tautomers

Metamers

Functional isomers

None of the above

Pick out the incorrect statement for transition metals.

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Cu+ is not a transition metal ion

Transition metals do not exhibit variable oxidation states

Transition metal ions are coloured

Transition metals and majority of their compounds are paramagnetic

Which of the following reactions have small enthalpy change.

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NaOH with HCl

NaOH with CH3 COOH

HCl with NH4 OH

None of these

What is the colour of pulp obtained from chemical pulping.

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Black

Brown

Blue

Red

What is defined as a local corrosion damaged characterized by surface cavities.

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Cracking

Pitting

Cavitation

Corrosion

Which of the following substance has been advocated as fuel of future.

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O2

N2

H2

H2O

Which of the following is not a component of a gas chromatography system.

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Carrier gas

Capillary column

Packed column

Cathode lamp

Steel is an alloy of iron and carbon with limits on the amount of carbon to less than _______ percent.

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2

3

1

4

Drying agent which react with CO2 and removes water vapours is.

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CaO

CaCl2

CaCO3

Ca(NO3)2

The magnitude of electron affinity depends on.

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Atomic size

Nuclear charge

Electronic configuration

All of the above

The number of significance figures in the number 80.7 is.

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1

2

3

4

Which librates H2 with NaOH

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B

AI

Zn

All

Which of the following has the maximum ionic character.

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HF

HCl

HI

HBr

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