Plus One / 11th Chemistry- Book Back Answers - Unit 3 - English Medium
Tamil Nadu Board 11th Standard Chemistry - Unit 3 : Book Back Answers and Solutions
This post covers the book back answers and solutions for Unit 3 – Chemistry from the Tamil Nadu State Board 11th Standard Chemistry textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Chemistry Unit 3 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 11 students! Prepare well and aim for top scores. Thank you!
Unit 3:PERIODIC CLASSIFICATION OF ELEMENTS
I. Choose the best answer.
1. What would be the IUPAC name for an element with atomic number 222?
a) bibibiium
b) bididium
c) didibium
d) bibibium
Answer key:
d) bibibium
b) AB2
c) A2B
d) none of the above
Answer key:
b) AB2
3. The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called
a) p-block elements
b) d-block elements
c) s-block elements
d) f-block elements
Answer key:
d) f-block elements
4. In which of the following options the order of arrangement does not agree with the variation of property indicated against it? (NEET 2016 Phase 1)
Answer key:
a) I < Br < Cl < F increasing electron gain enthalpy)
5.Which of the following elements will have the highest electronegativity?
a) Chlorine
b) Nitrogen
c) Cesium
d) Fluorine
Answer key:
d) Fluorine
6. Various successive ionisation enthalpies (in kJ mol - 1) of an element are given below.
The element is
a) phosphorus
b) Sodium
c) Aluminium
d) Silicon
Answer key:
c) Aluminium
7. In the third period the first ionization potential is of the order.
a) Na > Al > Mg > Si > P
b) Na < AI < Mg < Si < P
a) bibibiium
b) bididium
c) didibium
d) bibibium
Answer key:
d) bibibium
2. 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
a) ABb) AB2
c) A2B
d) none of the above
Answer key:
b) AB2
3. The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called
a) p-block elements
b) d-block elements
c) s-block elements
d) f-block elements
Answer key:
d) f-block elements
4. In which of the following options the order of arrangement does not agree with the variation of property indicated against it? (NEET 2016 Phase 1)
a) I
< Br < Cl < F increasing electron gain enthalpy)
b) Li
< Na < K < Rb (increasing metallic radius)
c) Al3+
<Mg2+ <Na+ <F- (increasing ionic
size)
d) B
< C < 0 < N increasing first ionisation enthalpy)Answer key:
a) I < Br < Cl < F increasing electron gain enthalpy)
5.Which of the following elements will have the highest electronegativity?
a) Chlorine
b) Nitrogen
c) Cesium
d) Fluorine
Answer key:
d) Fluorine
6. 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 |
a) phosphorus
b) Sodium
c) Aluminium
d) Silicon
Answer key:
c) Aluminium
7. In the third period the first ionization potential is of the order.
a) Na > Al > Mg > Si > P
b) Na < AI < Mg < Si < P
c) Mg > Na > Si > P > Al
d) Na < Al < Mg < P < Si
Answer key:
b) Na < AI < Mg < Si < P
8. Identify the wrong statement.
a) Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius
b) Amongst isoelectric species greater the negative charge on the anion, larger is the ionic radius
c) Atomic radius of the elements increases as one moves down the first group of the periodic table
d) Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.
Answer key:
a) Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius
9. Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy
a) Al < O < C < Ca < F
b) AI < Ca < O < C < F
c) C < F < O < Al < Ca
d) Ca < Al < C < O < F
Answer key:
d) Ca < Al < C < O < F
10. 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
a) I > Br > CI > F
b) F > Cl > Br > I
c) Cl > F > Br > I
d) Br > 1 > Cl > F
Answer key:
c) Cl > F > Br > I
11. Which one of the following is the least electronegative element?
a) Bromine
b) Chlorine
c) Iodine
d) Hydrogen
Answer key:
d) Hydrogen
12. The element with positive electron gain enthalpy is
a) Hydrogen
b) Sodium
c) Argon
d) Fluorine
Answer key:
c) Argon
13. The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8, 7 and 12 respectively
a) Y > Z > X > A
b) Z > A > Y > X
c) X > Y > Z > A
d) X > Y > A > Z
Answer key:
a) Y > Z > X > A
14. 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
a) Both assertion and reason are true and reason is correct explanation for the assertion
b) Both assertion and reason are true but the reason is not the correct explanation for the assertion
c) Assertion is true and the reason is false
d) Both assertion and the reason are false
Answer key:
c) Assertion is true and the reason is false
15. The electronic configuration of the atom having maximum difference in first and second ionisation energies is
a) 1s2 ,2s2 ,2p6 ,3s1
16. Which of the following is second most electronegative element?
a) Chlorine
b) Fluorine
c) Oxygen
d) Sulphur
Answer key:
c) Oxygen
d) Na < Al < Mg < P < Si
Answer key:
b) Na < AI < Mg < Si < P
8. Identify the wrong statement.
a) Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius
b) Amongst isoelectric species greater the negative charge on the anion, larger is the ionic radius
c) Atomic radius of the elements increases as one moves down the first group of the periodic table
d) Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.
Answer key:
a) Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius
9. Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy
a) Al < O < C < Ca < F
b) AI < Ca < O < C < F
c) C < F < O < Al < Ca
d) Ca < Al < C < O < F
Answer key:
d) Ca < Al < C < O < F
10. 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
a) I > Br > CI > F
b) F > Cl > Br > I
c) Cl > F > Br > I
d) Br > 1 > Cl > F
Answer key:
c) Cl > F > Br > I
11. Which one of the following is the least electronegative element?
a) Bromine
b) Chlorine
c) Iodine
d) Hydrogen
Answer key:
d) Hydrogen
12. The element with positive electron gain enthalpy is
a) Hydrogen
b) Sodium
c) Argon
d) Fluorine
Answer key:
c) Argon
13. The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8, 7 and 12 respectively
a) Y > Z > X > A
b) Z > A > Y > X
c) X > Y > Z > A
d) X > Y > A > Z
Answer key:
a) Y > Z > X > A
14. 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
a) Both assertion and reason are true and reason is correct explanation for the assertion
b) Both assertion and reason are true but the reason is not the correct explanation for the assertion
c) Assertion is true and the reason is false
d) Both assertion and the reason are false
Answer key:
c) Assertion is true and the reason is false
15. The electronic configuration of the atom having maximum difference in first and second ionisation energies is
a) 1s2
,2s2 ,2p6 ,3s1
b) 1s2
,2s2 ,2p6 ,3s2
c) 1s2
,2s2 ,2p6 ,3s2 ,3s7 ,3p6
,4s1
d) 1s2
,2s2 ,2p6, 3s2 ,3p1
Answer key:a) 1s2 ,2s2 ,2p6 ,3s1
16. Which of the following is second most electronegative element?
a) Chlorine
b) Fluorine
c) Oxygen
d) Sulphur
Answer key:
c) Oxygen
17. IE1
and IE2of Mg are 179 and 348 kcal mol-¹ respectively. The
energy required for reaction Mg→Mg2+
+ 2e- is
18. In a given shell the order of screening effect is
a) s > p > d > f
b) s > p > f > d
c) f > d > p > s
d) f > p > s > d
Answer key:
a) s > p > d > f
19. Which of the following orders of ionic radii is correct?
a)
+169 kcal mol-1
b) 169
kcal mol-1
c) +
527 kcal mol-1
d) 527
kcal mol-1
Answer
key:
c) +
527 kcal mol-1
18. In a given shell the order of screening effect is
a) s > p > d > f
b) s > p > f > d
c) f > d > p > s
d) f > p > s > d
Answer key:
a) s > p > d > f
19. Which of the following orders of ionic radii is correct?
a) H- >H+
>H
Answer key:
d) None of these
20. The First ionisation potential of Na, Mg and Si are 496, 737and 78 kJmol - 1 respectively. The ionisation potential of Al will be closer to
a) 760kJmol - 1
b) 575kJmol - 1
c) 801kJmol - 1
d) 419kJmol - 1
Answer key:
b) 575kJmol - 1
21. 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?
a) Decreases in a period and increases along the group
b) Increases in a period and decreases in a group
c) Increases both in the period and the group
d) Decreases both in the period and in the group
Answer key:
a) Decreases in a period and increases along the group
22. How does electron affinity change when we move from left to right in a period in the periodic table?
a) Generally increases
b) Generally decreases
c) Remains unchanged
d) First increases and then decreases
Answer key:
a) Generally increases
23. Which of the following pairs of elements exhibit diagonal relationship?
a) Be and Mg
b) Li and Be
c) Be and B
d) Be and Al
Answer key:
d) Be and Al
b) Na+
>F- >O2-
c) F
>O2- >Na+
d) None of theseAnswer key:
d) None of these
20. The First ionisation potential of Na, Mg and Si are 496, 737and 78 kJmol - 1 respectively. The ionisation potential of Al will be closer to
a) 760kJmol - 1
b) 575kJmol - 1
c) 801kJmol - 1
d) 419kJmol - 1
Answer key:
b) 575kJmol - 1
21. 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?
a) Decreases in a period and increases along the group
b) Increases in a period and decreases in a group
c) Increases both in the period and the group
d) Decreases both in the period and in the group
Answer key:
a) Decreases in a period and increases along the group
22. How does electron affinity change when we move from left to right in a period in the periodic table?
a) Generally increases
b) Generally decreases
c) Remains unchanged
d) First increases and then decreases
Answer key:
a) Generally increases
23. Which of the following pairs of elements exhibit diagonal relationship?
a) Be and Mg
b) Li and Be
c) Be and B
d) Be and Al
Answer key:
d) Be and Al
II. Short Answer Questions
11th ChemistryIII. Long Answer Questions
11th ChemistryIV. Exercise
11th Chemistry
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