Question # 1

The typical range of the H-bonding is:

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1-2 kj/mol of bonds

5-25 kj/mol of bonds

500 kj/mol of bonds

In addition to many pollutants present in ground water, a successful study was conducted to remove a highly Toxic chemical.What chemical is this

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Cobalt

Nickel

Arsenic

Sulphur

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

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Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1

According to Avogadros law 1 mole of gas at S.T.P has a volume of

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22.4 dm³

24 dm³

24000 cm³

2m³

Exhaust fumes of cars contain which poisonous gas

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CH₄

C₂H₆

CO

All of these

Which of the following is an application of electrochemical series

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Prediction of the feasibility of chemical reaction

Calculation of the cell voltage

Prediction of reaction of metal with dilute acid

All of the above

When gaseous chemicals are transported y road or by rail they are classified as follows:
flammable non-flammable poisonous
which gas is poisonous:

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butane

non-flammable

hydrogen

sulphur dioxide

Alkyl halides are considered to be very reactive compounds towards nucleophiles, because

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The have an electrophilic carbon

They have an electrophilic carbon and a bad leaving group

They have an electrophilic carbon and a good laving group

They have a nucleophilic carbon and a good leaving group

Choose a point which is not included in the components of environment:

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stratosphere

hydrosphere

lithosphere

biosphere

Ether show the phenomenon of

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Positional isomerism

Functional group isomeris

Meta merism

Cis trans isomerism

The equivalent weight of KMnO₄(formula weight = M) when it is used as an oxidant in neutral medium is

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M

M/2

M/3

M/5

The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is

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Iodide > bromide > chloride

Chloride > bromide > iodide

Bromide > chloride > iodide

Bromide > iodide > chloride

Ethanol can be converted into ethanoic acid :

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Hydrogenation

Hydration

Oxidation

Fermentation

Two H-atom combine to form a strong H₂molecule due to

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Increase in potential energy

Decrease in potential energy

Energy remains unchanged

Distance is increased

Chlorobenzene on heating with aqueous NH₃under pressure in the presence of cuprous chloride gives

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Benzamide

Nitrobenzene

Aniline

Chloroaminobenzene

At present the number of fertilizers plants in Pakistan are

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10

12

14

20

Orlon is a polymer of

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Tetrafluoroethylene

Acrylonitrile

Ethanoic acid

Benzene

Vegetable oils are

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Unsaturated fatty acids

Glycerides of unsaturated fatty acids

Glycerides of saturated fatty acids

Essential oils obtained from plants

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-1.10 V

+1.10 V

-0.42 V

+0.42 V

The conductivity of strong electrolyte

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Increases on dilution slightly

Does not change on dilution

Decreases on dilution

Depends on density of electrolyte it self

Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively

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Zinc dust and soda lime

Soda time and zinc dust

Zinc dust and sodium hydroxide

Soda lime and copper

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