Question # 1

The common temperature detecting device in DTA are.

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Thermocouples

Thermopiles

Thermistore

All

Most effective pesticide is

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Carbonates

Organophosphates

Organ chlorines

All of these

Different arrangement of groups in space which can be converted into one another by rotation around a single bond are caled.

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Conformations

Metameres

Enatiomers

All of the above

The wire of flash bulb is made up of.

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Cu

Ag

Mg

Ba

If steel is heated to a temperature well below red heated and is then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

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 is most soluble in water

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CaSO4

Sr SO4

MgSO4

BaSO4

The smog is essentially caused by the presence of.

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O3 and N2

O2 and N2

Oxides of sulphur and nitrogen

O2 and O3

The penultimate shell of carbon contains electrons.

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s2

s2p6

s2p6d10

s2p6d8

How many varieties of commercial iron are known.

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1

2

4

3

The pH of 0.001 N HCl is

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1

2

3

4

What combination of elements has high electrical resistance high corrosion resistance, and high strength at red hear temperatures, making it useful in resistance heating.

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Aluminium bronze

Nichrome

Hastelloy

None of above

The Hall process involves the reduction of Al2O3 to aluminium by

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Carbon

Carbon monoxide

Molecular hydrogen

Electrolysis

Red brass contain about how many percent of zinc.

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20 %

15 %

30 %

25 %

Form electron deficient compounds

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B

AI

Both B and AI

None of above

Which of the following anionic species is not separated by gravimetric analysis.

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Cl-

SO4

CH3COO-

PO4

The three isotopes of hydrogen differ from one another in

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Atomic number

Number of protons

Nuclear charge

Nuclear mass

Which of the following element has six electrons in the valence shell but cannot exhibit a maximum co valency of six.

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Sulphur

Oxygen

Selenium

Both A and B

The most convenient and has nearest approach to a universal pH measurement

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pH strips

pH indicator

The emf method

The colorimetric

C - O bond lengths in carboxylate anion are equal due to.

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Resonance effect

Inductive effect

Resonance of identical contributing structures.

Hyperconjugation

Argillaceous material does not include.

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Vlay

Marine shells

Slate

Blast furnace slag

Putrefaction is

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Hydrolysis of proteins

Reduction of proteins

Bacterial oxidation of proteins

All of these

Which of the following statement is not related with the advantages of TLC.

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A variety of adsorbents can be used

The thickness of adsorbent can be varied

Fluorescence can be introduced

Different detectors can be used

When orthoboric acid is heated strongly it gives.

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B2O3

H2B3O7

HBO2

B

Which of the following is class of nanorods

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metals

alloys

Metal oxide and Metal sulphite

All of the above

Pick out incorrect statement regarding HF

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It is used for making chlorofluorocarbon used as refrigerating fluids and as propellants in aerosols

It is used in making ASIF3 and synthetic cryolite

Aqueous HF is used for etchine glass

HF does not react with B2O3 even in presence of conc. H2SO4

Correct order of increasing ______ I effect of groups is

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----- NO2 >-----------CN > ------------COOH > -------------F

--------F > -------------COOH>----------CN>--------NO2

-----F> -------------CN>--------NO2 > COOH

-------CN > ------------COOH > -----------NO2 >----------F

Which of the following pollutant results from combustion of fossil fuels.

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SO2

NO2

CO

All above

An example of acrylic monoterpenoid is

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Dipentene

Myocene

a- terpineol

Limonene

The pH of water 7 at 25 ^oC if water is heated to 70^oC . Which of the following should be true.

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pH will decrees

pH will increase

pH will remain constant

None of these

Which of the following fuel is used in flame photometry.

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Hydrogen gas

Acetylene gas

Methane

Propane

All above

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