Question # 1

Copper is mainly extracted from witch of the following ore

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Sulphide ores

Carbonate ores

Oxides ores

Non sulphide ores

Hydrogen bons holding the strand to nucleic acids are formed between

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Sugar and base units

Base unit

Sugar ane phosphate units

Sugar units

Which of the following reactions does not take place with light radiation.

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Oxidation

Reduction

Polymerization

Double displacement

The most harmful components of incomplete combination are generally groped as particulate polyclic matter organic (PPOM) These materials are derivatives of .

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Benzene

Naphthalene

Benz a pyrene

None of the above

Which of the following process is not physical in nature.

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Mixing

Flocculation

Sedimentation

Activated sludge process

The maximum number of electrons in first energy levels are.

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1

2

8

10

Which of the following elements has the highest value of second ionization energy.

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Lithum

Beryllium

Boron

Magnesium

What is the scaling off of a surface in flakes or layers as the result of corrosion?

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Expoliation

Corrosion fatigue

Scaping

Fretting

The thermal conductivity of an SWNT along length is _____ watt/(m.k)

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35

330

386

3500

Which of the following is the correct order of interactions.

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Covalent < hydrogen bonding < Van Der Waal's < dipole -dipole

Van der Waal's < hydrogen bonding < dipole -dipole < covalent

Van der Waal's < dipole -dipole < hydrogen bonding < covalent

Dipole-dipole < Van der Waal's < hydrogen bonding < covalent

What is the approximate chromium range of a ferritic stainless steel.

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12% to 18%

16% to 20%

20% to 24%

12% to 16%

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

Which of the following regions of the spectrum would be used to determine the structure of the crystalline solids.

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Microwave

X-rays

Visible

Infrared

Petroleum is formed from

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Domestic animal

Organisms in sea

Wild animals

All above

Which of the following statements is NOT true .

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About 10% of the earth's crust is iron

Pure iron does not have significant industrial use because it is too weak and soft.

Steel in an alloy of carbon and iron with limits on the amount of carbon

None of above

Which of the following gas protects us form harmful effect of uv radiation.

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SO2

NO2

CO

O3

The law of triads is applicable to

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Lithium, beryllium, boron

Fluorine, chlorine, bromine

Chlorine, bromine, iodine

Sodium, potassium, Rubidium

The penultimate shells have pscudo inert gas type configuration.

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Ga

In

TI

All above

Transition metal possess

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Definite color

Catalytic power

Both A and B

None of above

What ASTM test for tension is designated for plastics.

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A 370

D 638

E 292

None of these

In which of the following group, each member given a positive iodoform test.

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Methanol, ethanol, propanone

Ethanol, isopropyl alcohol, methanol

Ethanol, ethanal, isopropyl alcohol

Propanal 2-propanol, propanone

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

Which of the following pollutant is not primary pollutant.

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Ash

Smoke

SO3

SO2

In the reaction RCO2Na + Na OH (CaO) ______ RH, we eliminate carboxylate group as.

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CO2

Na2CO3

-CO

CaCO3

Which of the following statement is incorrect about rock salt type

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It has for arrangement of Na+

Na+ and Cl- ions have coordination number of 6:6

A unit cell of NaCl metals have rock salt type structure.

None of them

Potassium crystallizes in a body centered lattice. Hence, the coordination number of potassium in potassium metal is.

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4

6

8

12

Reaction in which molecules absorbing light do not themselves react but induce other molecules to react are called.

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Chain reactions

Photosenaitized reactions

Reversible reactions

Free radical reactions

Which of the following is not an intensive property.

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Melting point

Refractive index

Entropy

Density

Which of the following halide has lowest melting point.

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NaCl

NaF

NaBr

NaI

Un-like s -block elements d-block elements form which compounds as well

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ionic compounds

Co valent compound

Co ordinate compounds

None of above

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