Question # 1

Potable water is considered to be

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Safe for human consumption

The ground water

The surface water

Now safe for human consumption

How many fertilizer plants are now in Pakistan?

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20

14

12

10

At present the number or cement factories in Pakistan are:

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20

22

25

30

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

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F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

Choose the correct statements

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SO₂affects the nucleus

SO₂affects plasmodesmata

SO₂affects cell wall

SO₂affects all membrane systems

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice

Which among the following will show anisotropy?

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Wood

Glass

Paper

BeCl2

Exhaust fumes of cars contain which poisonous gas

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CH₄

C₂H₆

CO

All of these

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

Which is not a component of environment?

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Biosphere

Lithosphere

Hydrosphere

None of these

Which of these the most widely used nitrogen fertilizer in Pakistan?

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urea

ammonium nitrate

ammonium sulphate

ammonium chloride

Which of the following form normal oxide

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K

Li

Na

None

Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because

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NO₂makes the electron rich ring at ortho and para positions

NO₂withdraws electrons at metaposition

NO₂donate electrons at m-position

NO₂withdraws electrons at ortho and para position

The standard EMF of Daniel cell is 1.10 volt. The maximum electrical work obtained from the Daniel cell is

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212.3 kJ

175.4 kJ

106.15 kJ

53.07 kJ

Colligative properties are the properties of :

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Dilute solutions which behave as nearly ideal solutions.

Concentrated solutions which behave as nearly non-ideal solutions.

Both(i) and (ii)

Neither (i) nor (ii)

Which of the following reagent will react with both aldehyde and ketones?

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Grinard's reagent

Tollen's reagent

Fehling's reagent

Benedict's reagent

Depletion of ozone layer is due to

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of the above

The electron affinity of chlorine may be represented by the equation

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The symbol of the element whose atoms have the outer most electronic configuration 2s²2p³is

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N

Li

P

Na

Which of the following is a nucleophile

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OH

CH(CH₃)₃

CH₃⁺

CH₃CH₂CH₃

"Each different compound should have a different name" was published by IUPAC system of nomenclature in

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1892

1830

1947

1979

The mass of one mole of proton is

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1.008 g

0.184 g

1.673 g

1.008 mg

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