Question # 1

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fluorine

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

Indicate the correct statement

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All lanthanidees are present in the same group

All halogens are present in the same period

All the alkali metals are present in the same group

All the noble gases are present int he same period

Eka-aluminium and Eka-silicon are known as

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Gallium and Germanium

Aluminium and silicon

Iron and sulphur

Proton and silicon

Which of the following ion has the highest value of ionic radius?

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Li⁺

F^-

O^2-

B³⁺

In sixth period 14 of its transition elements are called

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Lanthanides

Actinides

Radioactive elements

None

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 elements should be the least metallic in character

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Rb

ln

Te

l

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

Of the given alkali metals, the one with smallest size is

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Rb

Cs

K

Na

Electron affinity depends on

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Atomic size

Nuclear charge

Atomic number

Atomic size and nuclear charge both

Transition elements have valence electrons in

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s-orbital

p-orbital

d-orbital

f-orbital

An element of the third period (Na to S) is heated in chlorine. The product is purified and then added to water. The resulting solution is found to be neutral. What is the element

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Sodium

Aluminium

Silicon

Phosphorus

Which of the following elements have the largest radius

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F

Cl

Br

l

The correct arrangement of increasing order of atomic radius among Na, K, Mg, Rb is

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Mg < K < Na < Rb

Mg < Na < K < Rb

Mg < Na < Rb < K

Na < K < Rb < Mg

Ionic hydrides are generally

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Liquid at room temperature

Good electrical conductors

Good reducing agents

Easily reduced

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

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8

10

18

32

Elements in the same family have

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Same atomic number

Molecular wt same

Same chemical properties

Same electronic configuration

Among the elements given below, the one with highest electropositivity is

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Cu

Cs

Cr

Ba

Which of the following is most electronegative?

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Carbon

Silicon

Lead

Tin

According to Mendleev, the physical and the chemical properties are the periodic function of their

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Atomic number

Atomic mass

Atomic wt

None

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

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 is a member of -block

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Zn

Al

B

Br

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

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Na

Mg

K

Ca

Which is not interstitial hydride

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LaH

VH

TaH

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

In a period, melting points of elements

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Increases

Decreases

Remain constant

First increases then decreases

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

Although hydrogen resemble with the elements of group lA, IVA and Vll but it is usually placed in

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Group IA

Group IV A

Group VII

Group VIII

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

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

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