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

Question # 1

Elements in the same family have

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Same atomic number

Molecular wt same

Same chemical properties

Same electronic configuration

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Question # 2

Which of the following pairs are chemically dissimilar?

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Na and K

Ba and Sr

Zr and Hf

Ca and Zn

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Question # 3

Alkali metals in each period have

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Smallest size

Lowest IE

Highest IE

Highest electronegativity

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Question # 4

Which of the following has highest oxidation potential

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Question # 5

The structure of complex hydrides is

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Tetrahedal

Trigonal

Octahedral

Square planar

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Question # 6

The element with highest electron affinity among the halogen is

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Question # 7

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

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Question # 8

Which is the transition element among the following

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Question # 9

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

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Question # 10

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

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Question # 11

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

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Question # 12

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

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