Question # 1

The fourteen elements following actinium are known as

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Lanthanones

Lanthanides

Rare earths

Actinides

Elements in the same family have

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Same atomic number

Molecular wt same

Same chemical properties

Same electronic configuration

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

How does the ionization energy of 1st group elements vary?

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Increases down the group

Decreases down the group

Remains unchanged

Variation is not regular

Which of the following species has the highest ionization potential?

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Ne

Al⁺

Mg⁺

Li⁺

Which of the following has highest oxidation potential

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Be

Li

Na

Ca

Keeping in view the size of atoms, which order is the correct one

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > l

The correct order of electron affinity among the following is

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F > Cl > Br

Br > Cl > F

Cl > F > Br

F > Br > Cl

Which is not interstitial hydride

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LaH

VH

TaH

None

Which of the following metal requires radiation of highest frequency to cause emission of electrons?

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Na

Mg

K

Ca

The valency of noble gases, in general, is

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Zero

One

Three

Two

The number of groups in the periodic table is

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6

7

8

9

The amount of energy required to remove an electron from an atom of an element in the gaseous state is called

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Electron affinity

Electronegatively

Ionization energy

None of these

Which of the following does not exhibit the periodicity in properties of the elements?

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Ionisation energy

N/P ratio

Electronegativity

Atomic radius

The structure of complex hydrides is

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Tetrahedal

Trigonal

Octahedral

Square planar

The element with atomic number 26 will be found in group

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2

8

6

10

Which of the following represents elements in order of increasing atomic size?

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I, Br, Cl

Na, Mg, C

C, N, O

Li, Na, K

The horizontal rows in the periodic table are called periods. The number of period are

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5

6

7

8

Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride

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The ionic radius of the NH₄⁺ion is similar to that of Mg²⁺but not that of Na⁺

NH₄Cl dissociates less fully than NaCl

The ions Na⁺and Mg²⁺are isoelectronic (have the same number of electrons)

The ion NH⁺₄acts as an acid

Which of the following isoelectronic ions has the lowest ionization energy?

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K⁺

Ca²⁺

Cl^-

S^2-

The period table contains elements in vertical column. these vertical column are called

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Groups

Periods

Blocks

Sub group

Two elements whose electronegativities are 1.2 and 3.0, the formed between them would be

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Ionic

Covalent

Coordinate

Metallic

The elements of f-block are also known as

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Inner-transition

Outer transition

Normal elements

Alkaline earth metals

What is the nature of SO₂

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Basic

Strongly acidic

Weakly acidic

Amphoteric

In a group, the ionization energy

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Increase

Decreases

Remain constant

First increases then decreases

In a group form top to bottom, the hardness of alkali metals

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Remains unchanged

Increases

Decreases

None

The electropositive elements from

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Acidic oxides

Basic oxides

Neutral oxides

None

The elements of sub-group A are called

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Transition elements

Main elements

Typical elements

Rare earth elements

Among the following elements which one has the highest value of first ionization potential?

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Oxygen

Argon

Barium

Cesium

Which of the following pair of atomic numbers represents s-block elements?

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7, 15

6, 12

9, 17

3, 20

Which orbital is in the process of completion in case of transition elements

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p-orbital

f-orbital

d-orbital

s-orbital

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ECAT Chemistry Chapter 12 Periodic Classification of Elements and Periodicity Online Test MCQs With Answers

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