Question # 1

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

A catalyst increases the rate of a reaction because.

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It provides the necessary energy to the colliding molecules to cross energy barrier

It decreases the heat of the reaction

It decreases the order of the reaction

It provides a different path of lower activation energy.

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

Which of the following is not an androgen i.e. male sex hormones.

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Androsterone

Testosterone

Oestrone

All of these are make hormone

Co ordinate compounds are

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Polar

Non polar

Dem polar

None of above

The role of the mineral cryolite Na2AlF6 in the Hall process for aluminum production is.

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It is the source of aluminum

it is a chemical reducing agent

It forms a slag to remove impuriteis

In the molten state, it is a solvent for alumina Al2O3

For an elementary reaction

2A + B ------------------- C + D

The molecularity of the reaction is.

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1

2+

3

4

Group IV A consist of elements

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3

4

5

6

Carbohydrates are characterized by the presence of.

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Hydroxyl group

Carbony group

Asymmetric carbon

All of these

In emulsions , the dispersed phase and the dispersion medium are.

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Both solids

Both liquids

Both gases

Phase is liquid and medium is solid.

Which of the following pose threat to historical monument Taj.

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Floods in Yamuna river

Temperature mediated spoilage of marble

Air pollutants from Mathura refinery

Weathering of marble

After assimilation urea leaves behind in the soil

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NH3

CO2

Both A and B

None of above

Sodium Tetra borate is used

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As alkaline buffer in dying & bleaching process

In manufacture of opticl glass

in enameling and making glaze

All above

Which of the following acids acts as acid waste from coal mines.

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HCl

HNO3

CH3COOH

H3PO4

Arrange the following in order of increasing boiling point.

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CH3OH < CH3Cl < RbCl < CH4

CHOH < CH4 < CH3Cl < RbCl

RbCl < CH3Cl < CH3OH < CH4

CH4 < CH3Cl < CH3OH < RbCl

Aromatic amine (X) was treated with alcoholic potash and another compound (Y) when foul smelling gas was formed with formula C2H3N (Y) was formed by reacting a compound (Z) with Cl2 in the presence of slaked lime . The compound (Z) is

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C6H5NC

CHCl3

CH3CH2OH

C6H5NH2

Which of the following pollutant is not primary pollutant.

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Ash

Smoke

SO3

SO2

Which of the following technique is used to separate substance of high molecular weight of different charges.

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Dialysis

Electrophoresis

Solvent

None of the abvoe

The units of surface tension in SI system are

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Joule m-1

Newton m-1

Erg cm-1

Dynes cm-2

Dry ice is

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Solid CO

Solid CO2

Solid NH3

Solid SO2

What element is added to copper to increase its strength and fatigue propertioes.

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Silicon

Aluminium

Beryllium

Copper

The condensation between formaldehyde and acetaldehyde in the presence of conc. NaOH and heat gives.

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Acrolein

Mixture of CH3OH and CH3COO Na.

Mixture of CH3CH2OH and HCOO - Na+

None of these

Who coined the word nanotechnology.

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Eric Drexler

Richard Feynamann

Sumio tijma

Richard smalley

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 one of the following is not correct.

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Ar is used in electric bulbs

Kr is obtained during radioactive decay

Boiling point of H2 is lowest among all noble gases.

Xe forms Xe OF4

The emission of light in a biological reaction is known as

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Fluorescence

Phosphorescence

Bioluminescence

Photolysia

Which of the following techniques is used to separate a mixture of cations.

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GC

FPLC

Ion exchange chromatography

Size exchange chromatography

Which type of organic compounds does fat belong to.

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Alkene

Ester

Alkanol

Alkanoic acid

Environmental pollution effects.

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Biotic component

Plants only

Humans only

Both biotic and abiotic components of environment

Has the highest value of electronegativity

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F

Cl

Br

I

The width of a carbon nano tube is.________ nm

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1

1.3

2.5

10

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