Question # 1

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

Which element should have the greatest value for electronegativity when combined with hydrogen

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Na

Si

S

Cl

Who gave the concept of atomic number

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Newton

Mosley

Dalton

Newland

The oxides of electronegative elements are

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Basic

neutral

Acidic

Amphoteric

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

Number of elements present in 5th period is

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8

18

32

24

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

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 isoelectronic ions has the lowest ionization energy?

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K⁺

Ca²⁺

Cl^-

S^2-

From ₃₉Y to ₄₈Cd are called

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Transition elements

Outer transition elements

Inner transition elements

2nd transition series

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fluorine

Which of the following elements is/are not liquid at 30°C?

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Ga

Hg

Ge

Cs

Which of the following has highest oxidation potential

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Be

Li

Na

Ca

Which is the transition element among the following

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B

Al

Cu

Cs

Which of the following statement about fluorine is not correct?

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Electron affinity of chlorine is greater than that of fluorine

Bond energy of fluorine is less than that of chlorine

Fluorine cannot be prepared by electrolysis of fused metal fluorides

Fluorine does not form oxoacid

The hydration energy is the heat evolved when one mole of gaseous ion is dissolved in water. The hydration energy of an ion

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Increases with increase of charge to mass ratio

Decreases with increase of charge to mass ratio

Depends on sign of charge +ve or -ve

Depends upon the solvent

Which of the following statements is most appropriate about effective nuclear charge? It depends upon

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The shielding constant

The atomic number

The charge on the nucleus

Both the nuclear charge and the shielding constant

Ionization energy depends upon

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Nuclear charge

Atomic size

Shielding effect

All of the above

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

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Second period

First period

Third period

Fourth period

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

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8

10

18

32

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

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

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

The electropositive elements from

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Acidic oxides

Basic oxides

Neutral oxides

None

Rare earth elements are

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s-block elements

p-block elements

d-block elements

f-block elements

Which is true about the electronegativity order of the following?

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P > Si

C > N

Br > Cl

Sr > Ca

Which of the following element has the maximum electron affinity?

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F

S

I

Cl

The most distinctive character among the elements is their division into

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Metals and non-metals

Solids, liquids and gases

Atoms and molecules

Active and inactive elements

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

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Al₂O₃

MgO

SO₂

SIO₂

The classify the elements, Newland gave the idea of

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Octaves

Triads

Atomic volume

Atomic mass

All the elements belongs to the 2nd period are

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Normal elements

Transition elements

Stable elements

Halogens

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

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