Question # 1

The number of unpaired electrons present in Fe ions is

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1

2

5

0

AgNO₃ is a polymorphic having two different crystalline forms which are

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cubic, tetragonal

monoclinic, hexagonal

cubic, orthorhombic

orthorhombic, rhombohedral

The acidity of phenol is due to its

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Nature of Benzene

Double bond in benzene ring

Natute of phenoxide ion

Hydroxyl group

Reactivity of carbonyl compounds is due to

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Electrophilic carbon

Less stearic hindrance

Unsaturation of Co

Polarity of bond

Chemistry related to the study of environment affected by the chemicals and pollutants is called:

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Biochemistry

Physically chemistry

Pharmaceutical chemistry

Environmental chemistry

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

At ordinary temperature, the most nearly ideal gases are

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N₂

He

H₂

all these

When a compressed gas is allowed to expand into a region of low pressure, it produce:

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Vapours

Cooling effect

Heating effect

None of above

How many fertilizer plants are now in Pakistan?

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20

14

12

10

Which one of the following will behave least like an ideal gas at high temperature and low pressure?

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hydrogen fluoride

helium

oxygen

carbon dioxide

The reaction that generates an ionic bond is

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Halogenation of ethene

polymerization of ethene

Hydrogenation of ethyne

Reaction of ethyne withs sodamide

In the ground state of an atom, the electron is present

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

Rare earth elements are

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s-block elements

p-block elements

d-block elements

f-block elements

General formula of carbocyclic acids is:

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RCOH

RCOR

RCOOR

R-OH

Selection of filter paper depends upon sizes of particles to be:

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Tested

^Filtered

Checked

All of above

A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?

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SO

SO₂

SO₃

SO₄

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

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Stark effect

Zeeman effect

Compton effect

Photoelectric effect

The electropositive elements from

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Acidic oxides

Basic oxides

Neutral oxides

None

Macro-nutrients are required in quantities ranging from

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5 kg - 200 kg

2 kg - 100 kg

1 kg - 50 kg

10 kg - 100 kg

Which of the following oxides is amopheric in character?

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CaO

CO₂

SiO₂

SnO₂

Activation energy is the difference of energy between the energy of the reactant and

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The product

The activated complex

Both a and b

None of these

Sintered glass is porous material used for:

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Absorption

Decoration

Filtration

All of above

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