Question # 1

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

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

Number of elements present in 5th period is

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8

18

32

24

Two elements whose electronegativities are 1.2 and 3.0, the formed between them would be

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Ionic

Covalent

Coordinate

Metallic

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

From ₃₉Y to ₄₈Cd are called

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Transition elements

Outer transition elements

Inner transition elements

2nd transition series

Ionization potential increases in moving from left to right in a period

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Because nuclear charge increase

Because atomic size decrease

Both (a) and (b)

Because atomic size increases

All the elements belongs to the 2nd period are

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Normal elements

Transition elements

Stable elements

Halogens

Eka-aluminium and Eka-silicon are known as

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Gallium and Germanium

Aluminium and silicon

Iron and sulphur

Proton and silicon

The melting point is lowest for

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Be

Mg

Ca

Sr

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

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

Which statement explains the observation that magnesium hydroxide dissolve in aqueous ammonium chloride, but not in aqueous sodium chloride

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The ionic radius of the NH₄⁺ion is similar to that of Mg²⁺but not that of Na⁺

NH₄Cl dissociates less fully than NaCl

The ions Na⁺and Mg²⁺are isoelectronic (have the same number of electrons)

The ion NH⁺₄acts as an acid

Which of the following has highest first ionization potential?

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Carbon

Oxygen

Nitrogen

Boron

Which of the following elements should be the least metallic in character

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Rb

ln

Te

l

Which of the following is most electronegative?

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Carbon

Silicon

Lead

Tin

Which of the following is a member of -block

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Zn

Al

B

Br

Which of the following is an inert gas?

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H₂

O₂

N₂

Argon

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

Which of the following oxides is amopheric in character?

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CaO

CO₂

SiO₂

SnO₂

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

Mark the correct statement

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Na⁺is smaller than Na atom

Na⁺is larger than Na atom

Cl^-is the smaller than Cl atom

Cl^-(ion) and Cl (atom) are equal in size

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

The horizontal rows in the periodic table are called periods. The number of period are

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5

6

7

8

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

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Na

Si

S

Cl

The oxides of electronegative elements are

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Basic

neutral

Acidic

Amphoteric

What is the nature of SO₂

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Basic

Strongly acidic

Weakly acidic

Amphoteric

A pair of elements in the same family in the periodic classification is

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Cl and C

Ca and Al

N and Ne

Na and K

Variable valency is characteristic of

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Halogen

Transition elements

Alkali metals

Noble gas

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

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

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Oxygen

Argon

Barium

Cesium

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

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