Question # 1

Plastic are a pollution problem because many plastics

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Burn to produce toxic fumes

Decompose to produce toxic products

Are made from petroleum

Are very inflammable

Boiling point of H₂O is higher than that of HF although F is more electronegative than O. It is due to

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stronger dipole dipole forces in H₂O

H₂O is neutral HF is acidic

H₂O is angular, but HF is linear

number of hydrogen bonds more in H₂Othan in HF

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

Enzymes consist of

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proteins only

proteins and non-protein parts

fats only

futs and non-fatty components

Which sequence of step is correct for the manufacture of cement:

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Crushing, mixing, heating, grinding

Crushing, heating, mixing, grinding

Crushing, grinding, mixing, heating

Mixing, heating, grinding, crushing

The correct value of the gas constant R is close to

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0.082 litre-atm K^-1 mol^-1

0.082 litre-atm^-1 K mol

0.082 litre-atm K

0.082 litre-atm^-1 K mol^-1

Acetone and chloroform are soluble in each other due to:

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intermolecular hydrogen bonding

dipole-dipole interaction

instantaneous dipoles

all of the above

For which mechanisms, the first step involved is the same

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E1 and E2

E2 and SN2

E2 and E1

E1 and SN1

Which factor is helping to reduce the environment pollution

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rapid growth population

urbanization

idustrialization

increase of plantation

What is the morality of a solution containing 15g of urea is 500cm³ of solution?

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1M

0.5M

2M

1.5M

When 2-bromobutane reacts with alcoholic KOH, the reaction is called

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Chlorination

Halogenation

Dehydrohalogenation

Hydrogenation

Coal heated in the absence of air of about 500 - 1000°C is converted to

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Coke

Coal gas

Coal tar

All above

S_N1 reaction of alkylhalides leads to

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Retention of configuration

Recemisation

Inversion of configuration

None of these

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Cu

H

N

O

Which are used as essences(flowers)?

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aldehydes

Ketones

alcohols

esters

Sulphuric acid reacts with PCl₅to give

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Thionyl chloride

Sulphur monochloride

Sulphuryl chloride

Sulphur tetrachloride

The functional group isomer of dimethylether is

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Ethyl alcohol

Propyl alcohol

Diethyl ether

Butyl alcohol

The chemical formula of chile salt peter is

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Na₂CO₃

KNO₃

NaNO₃

NaNO₂

Polyester resins have special use in:

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Clothing

Paints

Emulsion

Floor covering

The tip of funnel should be 1 or 2cm larger than the circle of the

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Beaker

Solid

Filter paper

Liquid

Which compound was recognized the parent member of aromatic compounds

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Aniline

Phenol

Benzene

Toluene

Which gas is used for welding purposes

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Butane

Nitrogen

Methane

Acetylene

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