Question # 1

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 species has the highest ionization potential?

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Ne

Al⁺

Mg⁺

Li⁺

Transition elements have valence electrons in

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s-orbital

p-orbital

d-orbital

f-orbital

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

The valence shell of hydrogen is half filled like those of

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IV - A

VIA

V - A

VIIA

Which is not interstitial hydride

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LaH

VH

TaH

None

Gradual addition of electronic shells in the nobel gases causes a decrease in their

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Ionization energy

Atomic radius

Boiling point

Density

In a group, the ionization energy

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Increase

Decreases

Remain constant

First increases then decreases

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

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Rb

Cs

K

Na

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

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

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

In the modern periodic table the elements are placed in the ascending order of their

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Atomic masses

Melting points

Boiling points

Atomic numbers

The elements of group lA are called

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Chalocogens

Halogens

Alkali metals

Alkaline earth metals

The element with atomic number 26 will be found in group

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2

8

6

10

Which of the following elements have the largest radius

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F

Cl

Br

l

Doberiner arranged the similar elements into

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Pairs

Triads

Triplets

Rows

Which of the following discoveries resulted in a version of the Mendeleefs

periodic law

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The nucleus of atom by Rutherford

The elements polonium and radium by the Curies

Atomic numbers by Moseley

x-rays by Roentgen

In the periodic table, the element with atomic number 16 will be placed in the group

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Fourteen

Sixteen

Thirteen

Fifteen

The number of elements in the first, second and third period are

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2, 8, 18

8, 2, 18

2, 18, 8

2, 8, 8

Which of the following oxides is amopheric in character?

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CaO

CO₂

SiO₂

SnO₂

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

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

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

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Cu

Cs

Cr

Ba

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

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

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Na

Si

S

Cl

NaBH₄and LialH₄are

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Ionic hydrides

Covalent hydrides

Interposal hydrides

Complex hydrides

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 ion has the highest value of ionic radius?

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Li⁺

F^-

O^2-

B³⁺

Each vertical column of the periodic table includes elements with chemical characteristics that are in general

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Identical

Similar

Different

Similar as well as different

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

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