Question # 1

What is the sequence of electron take up and removal from 4s orbital a transition metal in 3d series?

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Enters first, leaves after 3d electrons removal

Enters after 3d electrons, leaves after 3d electrons

Enters after 3d eleetrons, leaves first

Enters first and leaves first

Air can be distilled fractionally because the constiltuents of the air:

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have different densities

can be liquefied

are gases at room temperature

have different boiling points

The reason of acid rain is:

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release of CO in excess by in complete combustion

excess release of NO₂ and SO₂ from burning of fossil fuels

Formation of NH₃ in excess form industry and coal gas

Formation of excess CO₂ due to combustion and respiration

Usually the % of moisture in paper is:

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1---3%

6---8%

4---6%

5%

Liquid crystals are used for the early diagnosis of breast cancer by

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injecting liquid crystals

taking liquid crystals as diet

painting liquid crystals on the surface of breast

inhaling the smell of liquid crystals

Sulphate aerosols cause severe respiratory problems particularly among

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Infants

Women

Young people

Old people

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

State of hybridization of carbon in the carbocation is

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sp3

sp

sp2

dsp2

Lithosphere extends upto kilometer of earth crust in depth:

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10 km

100 km

1000 km

10000 km

At present the number of cement factories is Pakistan are

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20

22

25

30

The energy produced by a carbohydrate is:

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3 kcal/gm

2kcal/gm

6kcal/gm

4kcal/gm

3-d series elements are present in:

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First period

Second Period

Third period

4th period

The colour of transition metal complexes is due to

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d-d transitions of electrons

Para magnetic nature of transition elements

Ionization

Loss of s-electrons

The heat of formation of SO₂(g) is -70.9 Kcal. The energy required for the decomposition of 1 mole of SO₂(g) is

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35.50 Kcal

70.9 Kcal

141.8 Kcal

-35.9 Kcal

Which of the following statement about fluorine is not correct?

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Electron affinity of chlorine is greater than that of fluorine

Bond energy of fluorine is less than that of chlorine

Fluorine cannot be prepared by electrolysis of fused metal fluorides

Fluorine does not form oxoacid

Meta directing group decreased the ----------- of benzene ring

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Physical activity

Chemical reactivity

Density

None

Grignard's reagent is

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Alkyl halide

Magnesium halide

Alkyl magnesium halide

Ethereal solution of an alkyl halide

Atoms obey octet rule by sharing-electrons making covalent bonds according to

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Lewis and Kossal theory

Valance bond theory

VSEPR theory

Molecular orbital theory

The two half cells of a galvanic cell are connected by

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Ammeter

Salt bridge

Hydrogen electrode

Copper electrode

The example of colligative property is

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Boiling point

Osmosis

Freezing point

Osmotic pressure

Which acid is used in the manufacture of synthetic fibre?

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

General formula of aromatic carboxyl acids

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R---------------OH

RCOOH

RCOR

ARCOOH

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