Telangana SCERT Class 10 Physical Science Chapter 8 Chemical Bonding Solution

Telangana SCERT Class 10 Physical Science Chapter 8 Solution – Chemical Bonding. Here in this post we provides Class 10 Physical Science Chemical Bonding Telangana State Board Solution. Telangana State Board English Class X Medium Students can download this Solution to Solve out Improve Your Learning Questions and Answers.

Telangana State Board Class 10 Physical Science Chapter 8 Chemical Bonding Solution:

 

CHAPTER: – 8

(Chemical Bonding)

 

Exercise: –

Reflections on concepts

1) Explain the difference between the valence electrons and the co-valency of an element.

Ans: – Covalency of an atom means how many bonds are made using the last orbital of that atom whereas valence electron is known the how many electrons of that atoms needed to form bond or forming of new element or compound.

 

2) Which chemical compound has the following Lewis notation:

a) How many valence electrons does element Y have?

b) What is the valency of element Y?

c) What is the valency of element X?

d) How many covalent bonds are there in the molecule?

e) To which groups the elements X and Y belong?

Ans: – (a) The valence electron of Y is 6.

(b) 2 is the valency of y.

(c) Valency of element x is 1.

(d) There are 2 covalent bonds in the molecule.

(e) X belongs to H2 whereas y belongs to O2.

 

3) How bond energies and bond lengths of molecule help us in predicting their chemical properties? Explain with examples.

Ans: – The bond length in two atom is large then according to the periodic law the energy required to break it will be easier whereas the small bond energy tells that the more energy is required for breaking it. Example: – In case of iodine there is needed a small amount of bond energy required less as it has more bond length.

 

4) Draw simple diagrams to show the arrangement of valence electrons in the following compounds:

a) Calcium oxide (CaO) (b) Water (H2O) (c) Chlorine (Cl2).

 

5) Represent each of the following atoms using Lewis’s notation:

(a) beryllium (b) calcium (c) lithium d) bromine (Br2) (e) calcium chloride (CaCl2) (f) carbon dioxide (CO2).

Ans: – 

 

Applications Concepts

1) Explain the formation of sodium chloride and calcium oxide on the basis of the concept of electron transfer from one atom to another atom.

Ans: –After studying the electronic configuration of Na and Ca we clearly say that there is valence electron in Na 3s^1 and Ca 3p^5. So, Na fills it octet by losing its valence electron while Ca needs to fill up its octet by receiving that electron from sodium so this two are formed the new compound.

 

2) A, B, and C are three elements with atomic numbers 6, 11 and 17 respectively.

i.) Which of these cannot form ionic bond? Why? (AS1)

ii.) Which of these cannot form covalent bond? Why? (AS1)

iii.) Which of these can form ionic as well as covalent bonds? (AS1)

Ans: – The compound which have 6, 11, and 17 atomic number are C, Na, and Cl.

(i) Carbon atom has no free electron so it couldn’t form ionic bond and it just only share its electron to form covalent bond in various organic compound.

(ii) Na has a tendency to lose its electron which is present in 3s^1 orbital and try to become octet by this property its only form ionic form not covalent bond.

(ii) The element Cl form both ionic and covalent bond, the reason behind that is ionic bond can be made with help of the electron present on 3p^5 orbital. For HCl it forms covalent bond by sharing it electron like covalent bond.

 

3) How does Lewis’s dot structure helps in understanding bond formation between atoms?

Ans: – The outer most shell of an atom is represented by the dot structure in Lewis’s notation. The outermost shell is represented by dot structure by this anyone can easily understand the valency of different types of atoms this structure which tells us about bond reaction property of that atom in forming different compound.

 

4) Explain the formation of the following molecules using valence bond theory

a) N2 molecule b) O2 molecule.

Ans: – 

 

Higher Order Thinking questions

1.) Two chemical reactions are described below. (AS5)

  • Nitrogen and hydrogen react to form ammonia (NH3)
  • Carbon and hydrogen bond together to form a molecule of methane (CH4).

For each reaction, give:

(a) The valence of each of the atoms involved in the reaction. (AS1)

(b) The Lewis structure of the product that is formed. (AS5)

Ans: – For the first reaction the valency of the involving element N2 is 3 and H2 is 1. For second reaction the valency of elements carbon is 4 and hydrogen is 1.

 

MULTIPLE CHOICE QUESTIONS.

1) Which one of the following four elements is more electronegative?

a) Sodium b) Oxygen c) Magnesium d) Calcium.

Ans: – option (b).

 

2) An element 11X23 forms an ionic compound with another element ‘Y’. Then the charge on the ionformed by X is

a) +1 b) +2 c) -1 d) -2.

Ans: – option (a)

 

3) An element ‘A’ forms a chloride ACl4. The number electrons in the valence shell of ‘A’ are

a) 1 b) 2 c) 3 d) 4.

Ans: – option (d)

 

4) The inert gas element which does not have octet electronic configuration in its outermost orbit is

a) Helium b) Argon c) Krypton d) Radon.

Ans: – option (a)

 

5) Number of covalent bonds in methane molecule

a) 1 b) 2 c) 3 d) 4.

Ans: – option d)

 

6) The concept hybridisation of orbitals of an atom was introduced by

a) Lives pouling b) Mosley c) Lewis d) Kossel.

Ans: – option (a)

 

7) The value of bond angle in Beryllium chloride molecule is

a) 180° b) 120° c) 110° d) 104°.

Ans: – option (a).

More Important Questions

Q.1) MCQ.

1) Two Nitrogen atoms having ———— bond between them?

a) Triple

b) Double

c) Ionic

d) Single

2) Which type of bond is seen in CH4 molecule————–?

a) Ionic

b) Single

c) Covalent

d) Triple

3) VSEPRT proposed by—————-?

a) Newlands

b) Sidgwick and Powell

c) Mendeleev

d) Humphry Davy

4) Cation is formed by?

a) Loss of electron

b) Gain of electron

c) Sharing of electron

d) None of these

5) Valence shell is—————?

a) k shell

b) Outermost shell

c) M shell

d) No shell is valence

6) Ionic bond formed when———-?

a) Sharing of electrons.

b) Electrostatic attractive force between ions.

c) Two hydrogens combined

d) None of these

7) Valence band theory states about———-?

a) Strengths of covalent bond

b) Strength of cations

c) Strength of ionic bond

d) None of these

8) Which is the following is more electronegative?

a) Na

b) O

c) Mg

d) Ca

9) Number of covalent bonds in Methane are——–?

a) 4

b) 3

c) 2

d) 6

10) Value of bond angle in Beryllium Chloride is?

a) 1800

b) 1200

c) 1100

d) 104031’

Q.2) VERY SHORT ANSWERS.

1) Define Octet electron configuration?

2) Define ionic bond?

3) Define chemical bond?

4) What is Covalent bond?

5) Give type of bond and physical appearance of HCl?

6) What is the angle in H2O molecule?

7) Define valence electrons?

Q.3) SHORT ANSWER QUESTIONS.

1) Complete the table.

  Property NaCl H2O
1 Mass
2 Melting point
3 Boiling point
4 Physical state

2) Explain formation of Sodium Chloride?

Q.4) LONG ANSWER QUESTIONS.

1) W, X, Y, and Z are three elements with atomic numbers 1,6,11,17 respectively.

a) Which of these cannot form ionic bond.

b) Which can form ionic bond.

c) Which can form covalent bond.

d) Which cannot form covalent bond.

e) Give name & configuration of each atom.

Answer Sheet

Q.1) MCQ.

1) Two Nitrogen atoms having ———— bond between them?

a) Triple

b) Double

c) Ionic

d) Single

2) Which type of bond is seen in CH4 molecule————–?

a) Ionic

b) Single

c) Covalent

d) Triple

3) VSEPRT proposed by—————-?

a) Newlands

b) Sidgwick and Powell

c) Mendeleev

d) Humphry Davy

4) Cation is formed by?

a) Loss of electron

b) Gain of electron

c) Sharing of electron

d) None of these

5) Valence shell is—————?

a) k shell

b) Outermost shell

c) M shell

d) No shell is valence

6) Ionic bond formed when———-?

a) Sharing of electrons.

b) Electrostatic attractive force between ions.

c) Two hydrogens combined

d) None of these

7) Valence band theory states about———-?

a) Strengths of covalent bond

b) Strength of cations

c) Strength of ionic bond

d) None of these

8) Which is the following is more electronegative?

a) Na

b) O

c) Mg

d) Ca

9) Number of covalent bond in Methane are——–?

a) 4

b) 3

c) 2

d) 6

10) Value of bond angle in Beryllium Chloride is?

a) 1800

b) 1200

c) 1100

d) 104031’

Q.2) VERY SHORT ANSWERS.

1) Define Octet electron configuration?

→ Octet rule states that atom tend to form compounds in ways that give Them eight valence electrons, and thus the electron configuration of N noble gas. An exception to an octet of electron is in the case of first Noble gas i.e., Helium, which has only 2 electrons. So, the configuration having 8 valence electrons is called Octet Electron configuration.

2) Define ionic bond?

→ The electrostatic attractive force that keeps cation and anion together To form a new electrically neutral entity is called an ionic bond.

3) Define chemical bond?

→ The force of attraction between any two atoms or groups of atoms That result in the formation of a stable entity called as chemical bond.

4) What is Covalent bond?

→ Chemical bond formed by sharing of electrons so that they both can attain octet electron configuration is called covalent bond.

5) Give type of bond and physical appearance of HCl?

→ Type of bond in HCl = Polar Covalent.

Physical appearance of HCl = Colorless gas.

6) What is the angle in H2O molecule?

→ Angle in H2O = 104031’

7) Define valence electrons?

→ Valence electrons are the electrons present in on outermost shell Of an atom.

Q.3) SHORT ANSWER QUESTIONS.

1) Complete the table.

  Property NaCl H2O
1 Mass 58.5 18
2 Melting point 8010C 00C
3 Boiling point 14130C 1000C
4 Physical state White crystalline solid Liquid colorless

2) Explain formation of Sodium Chloride?

→ Sodium Chloride formed from element Sodium and Chlorine.

Na(s) + ½ Cl (19)        NaCl(s)

Cation formation: – Na loses one electron to get octet electron Configuration & it formation a cation.

(Na+) ooid get configuration of Ne atom

Na (11) → Na+

Electron configuration = 2, 8, 1 →  2,8

Anion formation: – Chlorine accept one electron from the Na and from

Anion (Cl)

Cl (17) + e (-) → Cl (-)

Configuration: – 2, 8, 7 → 2, 8, 8

Formation of NaCl from its ions: –

These two ions Na+ and Cl attracted towards each other’s & form NaCl.

Na++ Cl → NaCl

Q.4) LONG ANSWER QUESTIONS.

1) W, X, Y, and Z are three elements with atomic numbers 1,6,11,17 respectively.

a) Which of these cannot form ionic bond.

b) Which can form ionic bond.

c) Which can form covalent bond.

d) Which cannot form covalent bond.

e) Give name & configuration of each atom.

→ Given: –    W = atomic number = 1

W = 1

X = 6

Y = 11

Z = 17

Elements are: –        W = 1 = Hydrogen

X = 6 = Carbon

Y = 11 = Sodium

Z = 17 = Chlorine

a) W, X Cannot form ionic bond.

b) Y, Z can form ionic bond.

c) W, X can form covalent bond.

d) Y, Z cannot form covalent bond.

e)

Atom no Name Electron configuration
1 Hydrogen 1S2 1
6 Carbon 1S2 2S2 2P2 2,4
11 Sodium 1S2 2S2 2P6 3S1 2,8,1
17 Chlorine 1S2 2S2 2P6 3S2 3P5 2,8,7
Updated: December 22, 2022 — 2:06 am

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