Question # 1

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

Neutralization of a strong acid with a strong base is

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Chemical equilibrium

Spontaneous reaction

Reversible process

Non-spontaneous

Mark the incorrect statement for periodic classification of elements:

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The first ionization energies of elements along a period do not very in a regular manner with increases in atomic number

the properties of elements are the periodic function of their atomic number

for transition elements the sub-shells are filled with electrons without variation with increases in atomic number

nonmetals are lesser in number than metallic elements

Which of the following element has the maximum electron affinity?

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F

S

I

CI

Which of the following has smallest solubility product

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Al(OH)₃

Ca(OH)₂

MG(OH)₂

Fe(OH)₃

The pH value of 0.001M HCI solution in water is:

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Exactly 7

< 7

> 7

Nearly 7

What is the concentration of [H⁺]_aqin 0.5 mol dm^-3solution of concentrated sulphuric acid?

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0.25 mol dm^-3

2 mol dm^-3

0.5 mol dm^-3

1 mol dm^-3

Elements in the periodic table are classified into four blocks This classification is based upon

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Valence orbital

Sub-shell

Shell

All

What is pH and pOH of pure water at 25°C

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7

14

1 x 10^-14

1 x 10¹⁴

Which of the following is an inert gas?

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H₂

O₂

N₂

Argon

K_avalue (the ionization constant) of HF acid is 6.7 x 10^-5the acid is a

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weak acid

moderately strong acid

strong acid

very weak acid

Electron affinity depends on

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Atomic size

Nuclear charge

Atomic number

Atomic size and nuclear charge both

Which of the following is a buffer solution

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Brine

Blood

Glue

Solution of CuSO₄

The element with atomic number 57 belongs to:

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s-block

transition elements

lanthanides

actinides

The solubility of PbF₂is 2.6 x 10^-3mole dm^-3, then its solubility product is

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2.6 x 10^-3

6.76 x 10^-6

5.2 x 10^-6

7.0 x 10^-8

The term dynamic equilirbrium means that

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the reaction has reached completion and no more product forms

the reaction has not reached completion but no more product forms

the rates of forward and backward reactions are equal and equal to zero

the rate of forward reaction is equal to the rate of backward reaction

The chemical properties of Li resemble with Na because they have equal:

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number of electrons in the outermost orbitals

atomic mass and atomic volume

number of protons in nuclei

number of neutrons in nuclei

The element with atomic number 14 belongs to:

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2^nd period

3^er period

4^th period

5^th period

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0.61

0.57

0.83

0.46

Mg++ has higher energy of hydration

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Si⁴

Al³⁺

Na⁺

Be⁺⁺

Law of mass action was presented by

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Henderson

Lawis

Arrhennius

Guldburg and waag

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