Question # 1

What is the nature of Al₂O₃

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Acidic

Basic

Amphoteric

Neutral

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

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

The fourth period contains elements

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8

16

18

32

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

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Ionic

Covalent

Coordinate

Metallic

According to Mendeleev, the properties of the elements are periodic function of their

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Atomic number

Atomic volumes

Atomic masses

Atomic densities

The classify the elements, Newland gave the idea of

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Octaves

Triads

Atomic volume

Atomic mass

Which species represented by the following formula has the largest radius

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P^3-

Cl^-

A_r

K⁺

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

The oxides of which of the following elements will be acidic in character

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Mg

Rb

Li

Cl

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

The elements with atomic numbers 9, 17, 35, 53, 85 an all

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Noble gases

Halogens

Heavy metals

Light metals

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

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Cu

Cs

Cr

Ba

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

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 elements have the largest radius

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F

Cl

Br

l

Which among the following species has the highest ionization energy?

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Ne

F

Li

B

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

The valency of noble gases, in general, is

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Zero

One

Three

Two

NaH is

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Ionic hydride

Complex hydride

Covalent hydride

Interstitial hydride

Elements in the same family have

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Same atomic number

Molecular wt same

Same chemical properties

Same electronic configuration

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

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

Which of the following isoelectronic ions has the lowest ionization energy?

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K⁺

Ca²⁺

Cl^-

S^2-

Which is the most volatile compound

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Hl

HCl

HBr

HF

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 does not exhibit the periodicity in properties of the elements?

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Ionisation energy

N/P ratio

Electronegativity

Atomic radius

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

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

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

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