Question # 1

When equal proportion of DH3_ l and C2H5 ___ l are treated with Na metal in preasence4 of dry ether, the number of possible hydrocarbons obtained will be:

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5

4

3

2

Which is the incorrect value of gas constant R?

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2.987 cal k^-1 mol ^-1

3.313 Nmk^-1 mol^-1

62400dm³ atm k^-1 mol^-1

1.10821atm dm3k^-1 mol^-1

Keeping the temperature constant, if the gas is expended:

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Kinetic energy of molecules will increase.

Number of gas molecules increases.

Temperature will increase.

Pressure will decrease.

Which is not an air pollutant

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N₂

CO

NO

N₂O

At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with size of temperature due to

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increase in average molecular speed

increase in number of moles

increase in molecular attraction

decrease in the distance between the molecules

Rancidification of fast and oils is due to:

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hydrolysis reaction

oxidation reaction

both a and b

hydrogenation reaction

Surface and ground water sources are contaminated by various human activities. Which of the following is not human activity that causes contamination in fresh water

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Live stock waste

Oil leaks and spills

Desposal of industrial effluents

Rain

The amount of heat absorbed when one mole of a liquid is changed into vapours at its boiling point is called

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Heat of sublimation

Heat of vaporization

Heat of fusion

Enthalpy change

D-block elements are also called

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Non-typical transition element

Outer transition elements

Abnormal transition elements

Inner transition

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

Phenol is colourless, crystalline and solid

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Hygroscopie

Deliquescent

Moistening

Odourless

When alkyl is treated with chlorine in the presence of sunlight

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1,3 dichloroproduct is formed

1,4 dichloro product is formed

1,3,5 trichloro product is formed

Only alkyl group is substituted

Pakistan in the beginning was a country :

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Industrial

Chemical

Agrarian

Technologies

Isopropyl alcohol on oxidation gives

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Acetone

Ether

Ethylene

Acetaldehyde

The substance which contains the water of crystallization is called

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Hydrated

Solvated

Crystal

None

The electron releasing effect of methyl group is significant and it makes ring a good

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Electrophilic

Nucleophilic

Nucleophobic

Hydrophobic

Which one of the following is a buffer

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HCI + NaCI solution

CH₃COOH + CH₃COONH₄solution

H₂SO₄+ CaSO₄solution

CH₃COOH + CH₃COONa

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Reaction occurs at STP

Reaction is exothermic

Reaction is endothermic

Number of moles of production and reactant are same

50 cm³of 0.05 molar nrea (N₂H₄CO) solution has % W/N concentration

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6%

3%

0.3 %

0.6 %

The chloroform reacts with NaOH to give

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CH₃COONa

Sodium oxalate

CH₃OH

HCOONa

What is the cause of water pollution

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Chemical and bacterial contents in live stock

The spilled oil in rivers and ponds

Wide spread use of pesticides

All of the above

Simple sugars are :

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Monosacchrides

Disaccharides

Oligo saccharides

Trisaccharides

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