Question # 1

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

Formalin contains-------% alcohol.

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37

80

8

52

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will

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remain unchanged

increase four times

reduce to 1/4

be doubled

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of:

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2 days

6 days

5 days

7 days

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Energy required to remove electron from an atom

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Ionization potential

Electronegativity

Electropositivity

Electron affinity

An example of regulatory protein is

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nucleoprotein

hemoglobin

lactoglobulin

thyroxine

Cl₂is a gas while iodine is a solid due to

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stronger London forces with high polarizability

greater electro negativity of Cl than iodine

stronger dipole dipole forces

iodine is colored while chlorine is colourless

The alkaline earth metals are called so because they

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form alkaline solution and are present in earth crust as minerals

form alkaline solution and are found in nature states

are present in earth crust

are present in earth crust as their minerals

An element that is not an essential par of proteins is

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O

N

H

S

Chloroethene, CH₂ = CHC/ is the monomer of PVC.
What are the C-C-C bond angles along the polymeric chain in PVC?

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They are all 109.5°

half are 109.5° and half are 120°

They are all 120°

They are all 180°

Chloroflurocarbon releases a chemical harmful to ozone

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Fluorine

Chlorine

Nitrogen peroxide

Sulphure dioxdie

Which on of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

The molarity of toluene solution in benzene is 0.22 if 5 grams of toluene dissolved, then mass of benzene is grams is

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267

260

240

247

The theory of chemical bonding has been a major problem of:

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Modern Physics.

Modern Chemistry.

Modern Biology.

Mechanics.

The rate at which a substance reacts is directly proportional to its active mass and the rate of reaction is directly proportional to the product of the active masses of reacting substances, is called

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Law of conservation of energy

Le-Chateliers principle

Law of mass action

None of these

Identify the incorrect statement with respect to ozone

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Ozone is formed in the upper atmosphere by a photochemical reaction involving dioxygen

Ozone is more reactive than diaoxygen

Ozone is diamagnetic whereas dioxygen is paramagnetic

Ozone protects the earth's inhabitants by absorbing gamma-radiations

Carboxylic acid, ester, amide and amino groups are shown. Which is the correct description of these functional groups

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At present the number of cement factories is Pakistan are

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20

22

25

30

18 g glucose is dissolved in 90 g of water. The relative lowering vapor pressure is equal to :

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1/5

5.1

1/51

6

Which element has highest oxidation potential

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Li

Be

Ba

Ra

Catalyst in the reaction ROH + SOCl₂-------> RCL+SO₂+HCl is:

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ZnCl₂

Pyridine

H₂SO₄

Either

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