Question # 1

The exothermic process is

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Evaporation

Sublimation

Respiration

Boiling

Water cover earth surface more than:

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50%

60%

70%

80%

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy?

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50000

20000

100000

10000

The boiling point of radon (211 K) is higher than boiling point of Helium (4.4 K) because

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the atomic number of Rn is larger than that of the He

the atomic mass of Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent that between He atoms

Rn atoms are joined by dipole-dipole force whereas He atoms are joined by hydrogen bonding

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

Test of incomplete combustion of petrol in the presence of

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CO₂

SO₂

NO₂

Co

The number paper industries in Pakistan are:

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30

25

35

20

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

Major food factors are?

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Fats and oils

Carbohydrates

Proteins

All of these

The basic difference between synthetic and natural fertilizer is in their

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raw material

crop application

usage

shapes

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

A single chloride free radical can destroy bow many ozone molecules?

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100

100000

10000

10

Denaturation of protein means the structure of protein is disrupted, indicate which factor foes not denature protein

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Heating protein

pH changes

Oxidising agent

Keeping pH 7.35

Solvent extraction method is a particularly useful technique of separation when the product to be separated is:

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non-volatile or thermally unstable.

volatile or thermally stable.

non-volatile or thermally stable.

volatile or thermally unstable.

Setting time of cement is controlled by adding:

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Epsom

Gypsom

CaCO₃

CaCl₂

Which of the following chlorocompounds is heat easily hydrolysed by hydorxide ion to give the product indicated

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1, 3-Dibromopropane reacts with metallic zinc to form

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Propene

Propane

Cyclopropane

Hexane

In which molecule carbon atom is sp²hybridized

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CH₄

C₂H₄

C₂H₂

None of the above

Solvay process is used in the manufacture of

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Na₂CO₃

NaHCO₃

CaCl₂

All

Benzene has a -------- structure

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Pentagonal

Hexagonal

Heptagonal

Tetragonal

Addition of solid NaHCO₃in water causes ionization of NaCHO₃its K_a= 4.7 x 10^-1. Then this solution has character

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Acidic

Very weakly basic

Alkaline

Neutral

Chromatography is derived from Greek word 'Khromatos' means:

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Type writting

Printing

Color writing

Writing

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