Question # 1

All the elements belongs to the 2nd period are

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Normal elements

Transition elements

Stable elements

Halogens

Among O, C, F, Cl, Br, the correct order of increasing radii is

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F O C Cl Br

F C O Cl Br

F Cl Br O C

C O F Cl Br

NaH is

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Ionic hydride

Complex hydride

Covalent hydride

Interstitial hydride

Which of the following oxides is unlikely to dissolve in aqueous hydroxide

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Al₂O₃

MgO

SO₂

SIO₂

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

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

The valence shell of hydrogen is half filled like those of

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IV - A

VIA

V - A

VIIA

In sixth period 14 of its transition elements are called

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Lanthanides

Actinides

Radioactive elements

None

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

Eka-aluminium and Eka-silicon are known as

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Gallium and Germanium

Aluminium and silicon

Iron and sulphur

Proton and silicon

According to the periodic law, the chemical properties of the elements are periodic functions of their

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Density

Atomic number

Atomic mass

Mass number

The valence shell electronic structure of an element is ns²np⁵. The element will along to the group of

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Alkali metals

Inert metals

Noble gases

Halogen

Which of the following is not true for metalloids

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They are borderline elements that exhibit both metallic and non-metallic properties to some extent

They usually act as electron donors with non-metals and as electron acceptors with metals

Some of these elements are boron, silicon and germanium

They are good conductors of heat and electricity

Electron affinity depends on

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Atomic size

Nuclear charge

Atomic number

Atomic size and nuclear charge both

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

The elements with atomic numbers 9, 17, 35, 53, 85 an all

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Noble gases

Halogens

Heavy metals

Light metals

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

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K⁺

Ca²⁺

Cl^-

S^2-

Which of the following has highest oxidation potential

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Be

Li

Na

Ca

Which of the following element has the maximum electron affinity?

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F

S

I

Cl

The element with atomic number 55 belongs to which block of the periodic table

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s-block

p-block

d-block

f-block

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

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Remains unchanged

Increases

Decreases

None

Doberiner arranged the similar elements into

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Pairs

Triads

Triplets

Rows

The structure of complex hydrides is

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Tetrahedal

Trigonal

Octahedral

Square planar

Ionic hydrides are generally

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Liquid at room temperature

Good electrical conductors

Good reducing agents

Easily reduced

The oxides of which of the following elements will be acidic in character

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Mg

Rb

Li

Cl

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

Which of the following is most electronegative?

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Carbon

Silicon

Lead

Tin

Number of elements present in 5th period is

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8

18

32

24

Which of the following elements have the largest radius

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F

Cl

Br

l

The statement that the properties of every eight elements are similar to the first is the law of

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Dobereiner

Newland

Mendeleev

L. Meyer

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

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