Question # 1

Which type of the coal preferred for metallurgical coal.

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Lignite

Peat

Bituminous coal

None of these

Boric Acid is used

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In manufacture of pottery glaze

In medicine as an antiseptic

In tanning industry

All above

A drop of a liquid acquires spherical shape because of.

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Its viscous nature

Capillary action

The tendency to acquire minimum surface are

Its shape

UV radiation from the sun causes a reaction in the atmosphere that leads to production

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Fluorides

Carbon monoxide

Sulphur dioxide

Ozone

Electronegativity of oxygen is.

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2,5

3,5

2,4

2.1

A type of a chemical bond which is formed by the mutual sharing of electrons between combining atoms of the same or different elements is called.

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Ionic bond

Covalent bond

Co ordinate Covalent bond

Metallic bond

What refer to the casehardening process by which the carbon content of the steel ear the surface of a part is increased?

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Carburizing

Annealing

Normalizing

None of these

Which of the following is a component of soap.

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Sodium sulphate

Sodium stearate

Sodium chloride

Sodium bromide

Phosphorus has the oxidation state of +3 in

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Orthophosphoric acid

Hypophosphoric acid

Metaphosphoric acid

Orthophosphorus acid

Disease caused by eating fish found in water contaminated with industrial waste having mercury is.

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Minamata disease

Bright's disease

Hashimoto's disease

Osteoaclerosis

Which of the following is atmospheric pollutant.

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CO2

CO

O2

N2

The most stable oxidation state of chromium is.

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+6

+3

+4

+2

The azimuth or angular quantum number (i) determines the number of sob shells in a given shall. the allowed values of l for a given value ffor n are.

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1.2.3.......................

1,2,3 ..................(n-1)

0.1.2.3................(n-1)

2,4,6,..............(n-2)

Which of the following analytical technique is based on the refraction of radiation.

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Conductometry

Refractometry

Coulometry

Potentiaometry

The IUPAC name of HOCCH2CH2CH2COOH is

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4- formylbutanoic acid

5- formylpentanoic acid

4- carboxybutanal

5- carboxypentanal

The diameter of fly ash particles is._________ micro meter

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5-10

10-20

20-30

100

In Pakistan the total production of glass is over ________ tons per year.

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800

8000

80,000

None of these

Which of the following mixture is used as most popular flame in AAS.

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Acetylene air

Acetylene O2

Hydrogen air

Hydrogen O2

A group that causes deepning of the colour is known as

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Bathchromic

Hypsochromic

Hypochromic

Hyperchromic

Stable metal ions strictures are.

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Noble gas structure

Is electron group structure

Transition metal in structure

All of the above

Which of the following technique is useful to remove metal ions from an interfering matrix.

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Solvent extraction

Electrophorests

Cataphorests

Gel permeation

Which of the following statement is not true with respect to photo chemical reactions.

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These take place in the presence of light

Free energy of these reactions may be positive or negative

Light intensity affect these reactions

Temperature has significant affect n rate of these reactions

Which of the following elements is most electropositive.

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C

N

O

Be

Is an instate able colourles gas with a sticky sweet odor and is extremely toxic.

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B2 H6

B4 H10

B3 H9

B6 H10

1-Chlorobutane on reaction with alcohols potash gives.

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1- butane

1-butanol

2- butane

2- butanol

Finely divided iorn combines with CO to give

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Fe(CO)3

Fe2 (CO)9

F33(CO)12

Fe(CO)6

The lowest K.E. for an electron is three dime national cubic box is given by

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h²/ 8m^a

3h² / 8 ma²

9h²/ 8ma²

16h² / 8ma²

What term is used to denote a family of thermosetting polymers that are reaction products of alcohols and acids.

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Alkaline

Alkydes

Alcocide

Ketones

Which of the following substance acts as gaseous pollutant.

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NO

NO2

CO

SO2

All above

Layer of the C -atom in graphite are hold together by

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Covalent bonds

Free electrons

Ionic bond

Van Dar Waals forces

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