Tamil Nadu Board of Secondary EducationHSC Science Class 11th

# Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 3 - Periodic Classification Of Elements [Latest edition]

## Chapter 3: Periodic Classification Of Elements

Choose the best AnswerWrite brief answer to the following questions
Choose the best Answer [Pages 93 - 96]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide Chapter 3 Periodic Classification Of ElementsChoose the best Answer [Pages 93 - 96]

Choose the best Answer | Q I. 1. | Page 93

What would be the IUPAC name for an element with the atomic number 222?

• bibibiium

• bididium

• didibium

• bibibium

Choose the best Answer | Q I. 2. | Page 93

The electronic configuration of the elements A and B are 1s2, 2s2, 2p6, 3s2 and 1s2, 2s2, 2p5 respectively. The formula of the ionic compound that can be formed between these elements is

• AB

• AB2

• A2B

• none of the above

Choose the best Answer | Q I. 3. | Page 93

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called ________.

• p-block elements

• d-block elements

• s-block elements

• f-block elements

Choose the best Answer | Q I. 4. | Page 93

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

• I < Br < Cl < F (increasing electron gain enthalpy)

• Li < Na < K < Rb (increasing metallic radius)

• Al3+ < Mg2+ < Na+ < F (increasing ionic size)

• B < C < O < N (increasing first ionisation enthalpy)

Choose the best Answer | Q I. 5. | Page 93

Which of the following elements will have the highest electronegativity?

• Chlorine

• Nitrogen

• Cesium

• Fluorine

Choose the best Answer | Q I. 6. | Page 93

Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.

 IE1 IE2 IE3 IE4 IE5 577.5 1,810 2,750 11,580 14,820

The element is

• phosphorus

• Sodium

• Aluminium

• Silicon

Choose the best Answer | Q I. 7. | Page 94

In the third period the first ionization potential is of the order.

• Na > Al > Mg > Si > P

• Na < Al < Mg < Si < P

• Mg > Na > Si > P > Al

• Na < Al < Mg < P < Si

Choose the best Answer | Q I. 8. | Page 94

Identify the wrong statement.

• Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius.

• Amongst isoelectric species greater the negative charge on the anion, larger is the ionic radius.

• Atomic radius of the elements increases as one moves down the first group of the periodic table.

• Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.

Choose the best Answer | Q I. 9. | Page 94

Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy

• Al < O < C < Ca < F

• Al < Ca < O < C < F

• C < F < O < Al < Ca

• Ca < Al < C < O < F

Choose the best Answer | Q I. 10. | Page 94

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I having atomic number 9, 17, 35 and 53 respectively is

• I > Br > Cl > F

• F > Cl > Br > I

• Cl > F > Br > I

• Br > I > Cl > F

Choose the best Answer | Q I. 11. | Page 94

Which one of the following is the least electronegative element?

• Bromine

• Chlorine

• Iodine

• Hydrogen

Choose the best Answer | Q I. 12. | Page 94

The element with positive electron gain enthalpy is

• Hydrogen

• Sodium

• Argon

• Fluorine

Choose the best Answer | Q I. 13. | Page 94

The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8, 7 and 12 respectively

• Y > Z > X > A

• Z > A > Y > X

• X > Y > Z > A

• X > Y > A > Z

Choose the best Answer | Q I. 14. | Page 95

Assertion: Helium has the highest value of ionisation energy among all the elements known

Reason: Helium has the highest value of electron affinity among all the elements known

• Both assertion and reason are true and reason is correct explanation for the assertion

• Both assertion and reason are true but the reason is not the correct explanation for the assertion

• Assertion is true and the reason is false

• Both assertion and the reason are false

Choose the best Answer | Q I. 15. | Page 95

The electronic configuration of the atom having maximum difference in first and second ionisation energies is

• 1s2, 2s2, 2p6, 3s1

• 1s2, 2s2, 2p6, 3s2

• 1s2, 2s2, 2p6, 3s2, 3s2, 3p6, 4s1

• 1s2, 2s2, 2p6, 3s2, 3p1

Choose the best Answer | Q I. 16. | Page 95

Which of the following is the second most electronegative element?

• Chlorine

• Fluorine

• Oxygen

• Sulphur

Choose the best Answer | Q I. 17. | Page 95

IE1 and IE2 of Mg are 179 and 348 kcal mol−1 respectively. The energy required for the reaction $\ce{Mg -> Mg^2+ + 2e^-}$ is

• + 169 kcal mol−1

• − 169 kcal mol−1

• + 527 kcal mol−1

• − 527 kcal mol−1

Choose the best Answer | Q I. 18. | Page 95

In a given shell the order of screening effect is

• s > p > d > f

• s > p > f > d

• f > d > p > s

• f > p > s > d

Choose the best Answer | Q I. 19. | Page 95

Which of the following orders of ionic radii is correct?

• H > H+ > H

• Na+ > F > O2−

• F > O2− > Na+

• None of these

Choose the best Answer | Q I. 20. | Page 95

The First ionisation potential of Na, Mg and Si are 496, 737 and 786 kJ mol-1 respectively. The ionisation potential of Al will be closer to

• 760 kJ mol-1

• 575 kJ mol-1

• 801 kJ mol-1

• 419 kJ mol-1

Choose the best Answer | Q I. 21. | Page 96

Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

• Decreases in a period and increases along the group

• Increases in a period and decreases in a group

• Increases both in the period and the group

• Decreases both in the period and in the group

Choose the best Answer | Q I. 22. | Page 96

How does electron affinity change when we move from left to right in a period in the periodic table?

• Generally increases

• Generally decreases

• Remains unchanged

• First increases and then decreases

Choose the best Answer | Q I. 23. | Page 96

Which of the following pairs of elements exhibit diagonal relationship?

• Be and Mg

• Li and Be

• Be and B

• Be and Al

Write brief answer to the following questions [Pages 96 - 97]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide Chapter 3 Periodic Classification Of ElementsWrite brief answer to the following questions [Pages 96 - 97]

Write brief answer to the following questions | Q II. 1. | Page 96

Define modern periodic law.

Write brief answer to the following questions | Q II. 2. | Page 96

What are isoelectronic ions? Give examples.

Write brief answer to the following questions | Q II. 3. | Page 96

What is the effective nuclear charge?

Write brief answer to the following questions | Q II. 4. | Page 96

Is the definition given below for ionisation enthalpy is correct?

"Ionisation enthalpy is defined as the energy required to remove the most loosely bound electron from the valence shell of an atom"

Write brief answer to the following questions | Q II. 5. | Page 96

Magnesium loses electrons successively to form Mg+, Mg2+ and Mg3+ ions. Which step will have the highest ionisation energy and why?

Write brief answer to the following questions | Q II. 6. | Page 96

Define electronegativity.

Write brief answer to the following questions | Q II. 7. | Page 96

How would you explain the fact that the second ionisation potential is always higher than the first ionisation potential?

Write brief answer to the following questions | Q II. 8. | Page 96

Energy of an electron in the ground state of the hydrogen atom is −2.18 × 10−18 J. Calculate the ionisation enthalpy of atomic hydrogen in terms of kJ mol−1.

Write brief answer to the following questions | Q II. 9. | Page 96

The electronic configuration of atom is one of the important factor which affects the value of ionisation potential and electron gain enthalpy. Explain

Write brief answer to the following questions | Q II. 10. | Page 96

In what period and group will an element with Z = 118 will be present?

Write brief answer to the following questions | Q II. 11. | Page 97

Justify that the fifth period of the periodic table should have 18 elements on the basis of quantum numbers.

Write brief answer to the following questions | Q II. 12. | Page 97

Elements a, b, c and d have the following electronic configurations:

• a: 1s2, 2s2, 2p6
• b: 1s2, 2s2, 2p6, 3s2, 3p1
• c: 1s2, 2s2, 2p6, 3s2, 3p6
• d: 1s2, 2s2, 2p1

Which elements among these will belong to the same group of the periodic table

Write brief answer to the following questions | Q II. 13. | Page 97

Give the general electronic configuration of lanthanides and actinides?

Write brief answer to the following questions | Q II. 14. | Page 97

Why do halogens act as oxidising agents?

Write brief answer to the following questions | Q II. 15. | Page 97

Mention any two anomalous properties of second period elements.

Write brief answer to the following questions | Q II. 16. | Page 97

Explain the Pauling method for the determination of ionic radius.

Write brief answer to the following questions | Q II. 17. | Page 97

Explain the periodic trend of ionisation potential.

Write brief answer to the following questions | Q II. 18. | Page 97

Explain the diagonal relationship.

Write brief answer to the following questions | Q II. 19. | Page 97

Why the first ionisation enthalpy of sodium is lower than that of magnesium while its second ionisation enthalpy is higher than that of magnesium?

Write brief answer to the following questions | Q II. 20. | Page 97

By using Pauling's method calculate the ionic radii of K+ and Cl ions in the potassium chloride crystal. Given that "d"_("K"^+) - "Cl"^- = 3.14 Å

Write brief answer to the following questions | Q II. 21. (i) | Page 97

Explain the following, give an appropriate reason.

Ionisation potential of N is greater than that of O

Write brief answer to the following questions | Q II. 21. (ii) | Page 97

Explain the following, give an appropriate reason.

First ionisation potential of the C-atom is greater than that of the B atom, whereas the reverse is true is for the second ionisation potential.

Write brief answer to the following questions | Q II. 21. (iii) | Page 97

Explain the following, give an appropriate reason.

The electron affinity values of Be and Mg are almost zero and those of N (0.02 eV) and P (0.80 eV) are very low.

Write brief answer to the following questions | Q II. 21. (iv) | Page 97

Explain the following, give an appropriate reason.

The formation of $\ce{F^-_{(g)}}$ from $\ce{F_{(g)}}$ is exothermic while that of $\ce{O^2-_{(g)}}$ from $\ce{O_{(g)}}$ is endothermic.

Write brief answer to the following questions | Q II. 22. | Page 97

What is the screening effect?

Write brief answer to the following questions | Q II. 23. | Page 97

Briefly give the basis for Pauling's scale of electronegativity.

Write brief answer to the following questions | Q II. 24. | Page 97

State the trends in the variation of electronegativity in groups and periods.

## Chapter 3: Periodic Classification Of Elements

Choose the best AnswerWrite brief answer to the following questions

## Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 3 - Periodic Classification Of Elements

Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 3 (Periodic Classification Of Elements) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 11th Chemistry Volume 1 and 2 Answers Guide solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Tamil Nadu Board Samacheer Kalvi textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 3 Periodic Classification Of Elements are Classification of Elements, Moseley's Work and Modern Periodic Law, Nomenclature of Elements with Atomic Number Greater than 100, Grouping of Elements Based on Electronic Configurations, Periodic Trends in Properties, Periodic Trends in Chemical Properties, Introduction to Periodic Classification of Elements.

Using Tamil Nadu Board Samacheer Kalvi Class 11th solutions Periodic Classification Of Elements exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Tamil Nadu Board Samacheer Kalvi Solutions are important questions that can be asked in the final exam. Maximum students of Tamil Nadu Board of Secondary Education Class 11th prefer Tamil Nadu Board Samacheer Kalvi Textbook Solutions to score more in exam.

Get the free view of chapter 3 Periodic Classification Of Elements Class 11th extra questions for Class 11th Chemistry Volume 1 and 2 Answers Guide and can use Shaalaa.com to keep it handy for your exam preparation