Question # 1

The valency of noble gases, in general is

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Zero

One

Three

Two

f block elements are also called

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Outer transition element

Inner transition elements

Alkaline earth elements

Coinage earth metal

The element having largest radius is:

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F

I

CI

Br

The strongest base among the following is

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LiOH

RbOH

KOH

NaCH

Point out one of these that does not reflect the periodicity of the elements:

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ionization potential

electronegativity

bonding behavior

neutron/proton ratio

The atomic radius increases as we move down a group because

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Effective nuclear charge increases

Atomic mass increases

Additive electrons are accommodated in new electron level

Atomic number increases

In llnd period of periodic table, a regular decreace in found in

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electronegativity

atomic radii

ionization potential

atomic mass

According to the Periodic Law of elements, the variation in properties of elements is related to their

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Atomic masses

Nuclear masses

Atomic numbers

Nuclear neutron-proton number ratios

Which one of the following aqueous solutions has the highest pH

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0.1 MnaOH

0.1 MHCl

0.2 MH₂SO₄

0.1 MHNO₃

The number of elements in the 4th period of periodic table is

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8

10

18

32

Which of the following is an inert gas?

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H₂

O₂

N₂

Argon

Acid and bases when dissolves in water:

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May not be completely dissociated

May be completely dissociated

May or may not be completely dissociated

None of above

Law of mass action was given by:

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Guldberg and Waage

Berkeley and Hartly

Ramsey and Reyleigh

Berthelot

The energy required in addition to average energy of reactants to convert them into products is called

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enthalpy function

heat of reaction

effective energy

activation energy

The pH of neutral solution having pKw = 13.26 at 50°C is

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6

6.63

7

7.13

Which one of the following has highest pH:

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Distilled water

Water saturated with chlorine gas

1M NH₄OH

1M NaOH

The rate of which the reaction proceeds is directly proportional to the product of the active masses of the reactants is according to

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law of mass action

Le Chateliers principle

Equilibrium law

Law of constant proportion

The element with highest electron affinity among the halogen is

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F

CI

Br

I

In a vessel containing SO₃, SO₂and O₂at equilibrium, some helium has is introduced so that the total pressure increases while temperature and volume remain constant. According to Le Chatelier's principle, the dissociation of SO₃

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Increases

Decreases

Remain unaltered

Changes unpredictably

The correct order of electron affinity of B, C, N, O is

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O > C > N > B

B > N > C > O

O > C > B > N

O > B > C > N

0.1 M HCl has pH = 1.0, it is about 100 times stronger than acetic acid. Then pH of acetic acid will be

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0.1

2.0

1.3

3

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