Question # 1

Water is purified by the process:

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Aeration

Coagulation

Chlorination

All of these

Which of the following transition metal forms colourless compounds in +4 oxidation state?

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Ti

Cr

Cu

Zn

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

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urea

ammonium nitrate

ammonium sulphate

ammonium chloride

Example of essential aromatic amino acids

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Theronine

Alanine

Phenyl alanine

Glycine

Compressibility factor for an ideal gas is

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1.5

1.0

2.0

0.5

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

Which of these has at least one d electron

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Sc+3

Mn+7

Ti+4

Cr+3

Absolute temperature is the temperature at which

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All molecular motion ceases

volume becomes zero

Mass becomes zero

None of these

The electrolyte used in fuel cell is

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КOH

NaCl(aq)

NaNO3

Molten NaCl

The helical structure of protein is stabilized by

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Peptide bond

Covalent

Hydrogen bond

Glycoside bond

What is component of environment?

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Atmosphere

Hydrosphere

Lithosphere

All of these

The relative abundance of the ions with a definite m/e value is measured by

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High pressure of vapours

Strength of electric current measured

Quantity of fast moving electrons

Electron gas

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

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N

Li

P

Na

Elements in the same family have

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Same atomic number

Molecular wt same

Same chemical properties

Same electronic configuration

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

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Beaker

Solid

Filter paper

Liquid

The electrode through which the electrons enter the electrolytic solution is electrolytic solution is

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Anode

Cathode

May be anode or cathode

None of these

The main pollutant of leather tanneries in the waste is due to the salt of:

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lead

Chromium (VI)

Copper

Chromium (III)

The number of neutrons in the element ⁹₄Be is

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4

5

9

13

When methane reacts with Cl₂in the presence of diffused light the products obtained are?

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Chloroform only

Carbon tetrachloride only

Chloromethane and dichloromethane

Mixture of a,b,c

Number of moles of the solute dissolved per dm³of the solution is knows as

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Molarity

Formality

%age

None of these

Surfactants are organic compounds, used in detergents which reduce the

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Viscosity of water

Surface tension of water

Boiling point of water

Wetting ability of water

Which one of the following gases is used for artificial ripening of fruits ?

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Ethane

Ethyne

Methane

Propane

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