Question # 1

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

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Na

Mg

K

Ca

The element with atomic number 26 will be found in group

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2

8

6

10

The melting point is lowest for

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Be

Mg

Ca

Sr

Which of the following statement about electron affinity of two elements is correct

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Carbon has greater than oxygen

Sulphur has less than oxygen

Iodine has greater than bromine

Bromine has less than chlorine

Li, Be, B, C, O, Fl Ne are elements of

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Second period

First period

Third period

Fourth period

Who gave the concept of atomic number

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Newton

Mosley

Dalton

Newland

Which of the following sets of atomic numbers belong to that of the alkali metals?

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1,12,30,4,62

37,19,3,55

9,17,35,53

12,20,56,88

Ionic hydrides are generally

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Liquid at room temperature

Good electrical conductors

Good reducing agents

Easily reduced

Which is not interstitial hydride

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LaH

VH

TaH

None

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

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

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Groups

Periods

Blocks

Sub group

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

For the representative elements from left to right across a period in the periodic table, the electron effinity of the atom generally

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Increases

Remains constant

Decreases

Not clear

The classify the elements, Newland gave the idea of

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Octaves

Triads

Atomic volume

Atomic mass

The number of groups in the periodic table is

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6

7

8

9

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 of the following elements should be the least metallic in character

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Rb

ln

Te

l

The elements of group lA are called

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Chalocogens

Halogens

Alkali metals

Alkaline earth metals

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

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 has highest first ionization potential?

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Carbon

Oxygen

Nitrogen

Boron

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

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

The valency of noble gases, in general, is

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Zero

One

Three

Two

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

The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its

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Electron affinity

Electronegativity

Ionisation energy

Valency

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

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Oxygen

Argon

Barium

Cesium

Number of elements present in 5th period is

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8

18

32

24

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

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