NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Multiple Choice Questions (Type-II)>Q 19

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Which of the following sets contain only isoelectronic ions?

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Important Questions on Classification of Elements and Periodicity in Properties

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NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Multiple Choice Questions (Type-II)>Q 20

In which of the following options, the order of arrangement does not agree with the variation of the property indicated against it?

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NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Multiple Choice Questions (Type-II)>Q 21

Which of the following have no unit?

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NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Multiple Choice Questions (Type-II)>Q 22

Ionic radii vary in

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NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Multiple Choice Questions (Type-II)>Q 23

An element belongs to

3^{rd}

period and group-

13

of the periodic table. Which of the following properties will be shown by the element?

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NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 24

Explain why the electron gain enthalpy of fluorine is less negative than that of chlorine.

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NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 25

All transition elements are

d

-block elements, but all

d

-block elements are not transition elements. Explain.

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NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 26

Identify the group and valency of the element having the atomic number

119

. Also, predict the outermost electronic configuration and write the general formula of its oxide.

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NCERT Exemplar Chemistry - Class 11>Chapter 3 - Classification of Elements and Periodicity in Properties>Short Answer Type>Q 27

Ionisation enthalpies of elements of the second period are given below
Ionisation enthalpy $/ k cal {mol}^{- 1}$ $520, 899, 801, 1086, 1402, 1314, 1681, 2080 .$

Match the correct enthalpy with the elements and complete the graph given in the figure. Also, write symbols of elements with their atomic number.

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