11th Chemistry - Book Back Answers - Unit 10 - English Medium Guides

 

 

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Tamil Nadu Board 11th Standard Chemistry - Unit 10 : Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 10  – 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 10 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 10:Chemical Bonding

I. Choose the best answer.

1. In which of the following Compounds does the central atom obey the octet
rule?
a) XeF₄
b) AlCl₃
c) SF₆
d) SCl₂
Answer Key:
d) SCl₂
 
2. In the molecule O_A = C = O_B, the formal charge on O_A, C and O_B are respectively.
a) -1, 0, + 1
b) +1, 0,-1
c) -2,0,+2
d) 0,0,0
Answer Key:
d) 0,0,0
 
3. Which of the following is electron deficient?
a) PH₃
b) (CH₃)₂
c) BH₃
d) NH₃
Answer Key:
c) BH₃

 

4. Which of the following molecule contain no л bond?
a) SO₂
b) NO₂
c) CO₂
d) H₂O
Answer Key:
c) CO₂
 
5. The ratio of number of sigma (σ) and pi (л) bonds in 2- butynal is
a) 8/3
b) 5/3
c) 8/2
d) 9/2
Answer key:
a) 8/3
 
6. Which one of the following is the likely bond angles of sulphur tetrafluoride
molecule?
a) ${120}^{\circ }$,${80}^{\circ }$
b) ${109}^{\circ }$.28
c)${\mathrm{ 90}}^{\circ }$
d)${\mathrm{ 89}}^{\circ }$${117}^{\circ }$
Answer key:
d)${\mathrm{ 89}}^{\circ }$${117}^{\circ }$
 
7. Assertion: Oxygen molecule is paramagnetic.
Reason : It has two unpaired electron in its bonding molecular orbital
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) Both assertion and reason are false
Answer key:
c) assertion is true but reason is false
 
8. According to Valence bond theory, a bond between two atoms is formed when
a) fully filled atomic orbitals overlap
b) half filled atomic orbitals overlap
c) non- bonding atomic orbitals overlap
d) empty atomic orbitals overlap
Answer key:
b) half filled atomic orbitals overlap
 
9. In ClF₃ ,NF₃ and BF₃ molecules the chlorine, nitrogen and boron atoms are
a) sp₃ hybridised
b) sp₃ ,sp₃ and sp₂ respectively
c) sp₂ hybridised
d) sp₃d, sp₃ and sp₂ hybridised respectively
Answer key:
d) sp₃d, sp₃ and sp₂ hybridised respectively
 
10. When one s and three p orbitals hybridise,
a) four equivalent orbitals at ${\mathrm{ 90}}^{\circ }$ to each other will be formed
b) four equvivalent orbitals at ${109}^{\circ }$ 28' to each other will be formed.
c) four equivalent orbitals, that are lying the same plane will be formed
d) none of these
Answer key:
b) four equvivalent orbitals at ${109}^{\circ }$ 28' to each other will be formed.
  
11. Which of these represents the correct order of their increasing bond order.
a) C₂ < C₂^2- < O₂^2- < O₂
b) C₂^2- < C₂ + < O₂ < O₂^2-
c) O₂^2- < O₂ < C2 ₂- < C₂⁺
d) O₂^2- < C₂⁺< O₂ < C₂^2-
Answer key:
d) O₂^2- < C₂⁺< O₂ < C₂^2-
 
12. Hybridisation of central atom in PCl₅ involves the mixing of orbitals.
a) s, p_x, p_y, d_x2 , d_x2-y2
b) s, p_x, p_y, p_xy , d_x2-y2
c) s, p_x, p_y , p_z , d_x2-y2
d) s, p_x , p_y , d_xy , d_x2-y2
Answer key:
c) s, p_x, p_y , p_z , d_x2-y2
 
13. The correct order of O-O bond length in hydrogen peroxide, ozone and oxygen is
a) H₂O₂ > O₃ >O₂
b) O₂ > O₃ > H₂ O₂
c) O₂ > H₂ O₂ > O₃
d) O₃ > O₂ > H₂ O₂
Answer key:
b) O₂ > O₃ > H₂ O₂
 
14. Which one of the following is diamagnetic.?
a) O₂
b) O₂^2-
c) O₂+
d) None of these
Answer key:
b) O₂^2-
 
15. Bond order of a species is 2.5 and the number of electons in its bonding molecular orbital is formd to be 8 The no. of electons in its antibonding molecular orbital is
a) three
b) four
c) Zero
d) can not be calculated from the given information
Answer key:
a) three
 
16. Shape and hybridisation of IF₅ are
a) Trigonal bipyramidal, sp³d²
b) Trigonal bipyramidal, sp³d
c) Square pyramidal, sp³d²
d) Octahedral, sp³d²
Answer key:
c) Square pyramidal, sp³d²
  
17. Pick out the incorrect statement from the following
a) Sp³ hybrid orbitals are equivalent and are at an angle of ${109}^{\circ }$ 28' with eachother
b) dsp² hybrid orbitals are equivalent and bond angle between any two of them is 90${\circ }^{}$
c) All five sp³d hybrid orbitals are not equivalent out of these five sp³d hybrid orbitals, three are at an angle of ${120}^{\circ }$, remainir two are perpendicular to the plane containing the other three
d) none of these
Answer key:
c) All five sp³d hybrid orbitals are not equivalent out of these five sp³d hybrid orbitals, three are at an angle of 120${\circ }^{}$, remainir two are perpendicular to the plane containing the other three
 
18. The molecules having same hybridisation, shape and number of lone pairs of electons are
a) SeF₄, XeO₂ F₂
b) SF₄, Xe F₂
c) XeOF₄, TeF₄
d) SeCl₄, XeF₄
Answer key:
a) SeF₄, XeO₂ F₂
 
19. In which of the following molecules / ions BF₃, NO_2-, H₂O the central atom is sp₂ hybridised?
a) NH₂^- and H₂O
b) NO₂^- and H₂O
c) BF₃ and NO₂^-
d) BF₃ and NH₂^-
Answer key:
c) BF₃ and NO₂^-
 
20. Some of the following properties of two species, NO₃^- and H₃O⁺ are described below. which one of them is correct?
a) dissimilar in hybridisation for the central atom with different structure.
b) isostructural with same hybridisation for the Central atom.
c) different hybridiration for the central atom with same structure
d) none of these
Answer key:
a) dissimilar in hybridisation for the central atom with different structure
 
21. The types of hybridiration on the five carbon atom from right to left in the, 2,3 pentadiene.
a) sp³, sp², sp, sp², sp³
b) sp³, sp, sp, sp, sp³
c) sp², sp, sp²,sp², sp³
d) sp³, sp³, sp², sp³, sp³
Answer key:
a) sp³, sp², sp, sp², sp³
 
22. Xe F₂ is isostructural with
a) SbCl₂
b) BaCl₂
c) TeF₂
d) ICl₂^–
Answer key:
d) ICl₂^–
 
23. The percentage of s-character of the hybrid orbitals in methane, ethane, ethene and ethyne are respectively
a) 25, 25,33.3,50
b) 50,50,33.3,25
c) 50,25,33.3,50
d) 50,25,25,50
Answer key:
a) 25, 25,33.3,50
 
24. Of the following molecules, which have shape similar to carbon dioxide?
a) SnCl₂
b) NO₂
c) C₂ H₂
d) All of these
Answer key:
c) C₂ H₂
 
25. According to VSEPR theory, the repulsion between different parts of electrons obey the order.
a) l.p – l.p > b.p–b.p> l.p–b.p
b) b.p–b.p> b.p–l.p> l.p–b.p
c) l.p–l.p> b.p–l.p > b.p–b.p
d) b.p–b.p> l.p–l.p> b.p–l.p
Answer key:
c) l.p–l.p> b.p–l.p > b.p–b.p
 
26. Shape of ClF₃ is
a) Planar triangular
b) Pyramidal
c) 'T' Shaped
d) none of these
Answer key:
c) 'T' Shaped
 
27. Non- Zero dipole moment is shown by
a) CO₂
b) p-dichlorobenzene
c) carbontetrachloride
d) water
Answer key:
d) water
 
 
28. Which of the following conditions is not correct for resonating structures?
a) the contributing structure must have the same number of unpaired electrons
b) the contributing structures should have similar energies
c) the resonance hybrid should have higher energy than any of the contributing structure.
d) none of these
Answer key:
c) the resonance hybrid should have higher energy than any of the contributing structure.
 
29. Among the following, the compound that contains, ionic, covalent and Co-ordinate linkage is
a) NH₄Cl
b) NH₃
c) NaCl
d) none of these
Answer key:
a) NH₄Cl
 
30. CaO and NaCl have the same crystal structure and approximately the same radii. It U is the lattice energy of NaCl, the approximate lattice energy of CaO is
a) U
b) 2U
c) U/2
d) 4U
Answer key:
d) 4U

 

II. Short Answer Questions

11th Chemistry

III. Long Answer Questions

11th Chemistry

IV. Exercise

11th Chemistry