TS 10th Class Physical Science Bits Chapter 8 Chemical Bonding

These TS 10th Class Physical Science Bits with Answers Chapter 8 Chemical Bonding will help students to enhance their time management skills.

TS 10th Class Physical Science Bits Chapter 8 Chemical Bonding

Question 1.
An ionic bond is also called : ( )
(A) metallic bond
(B) electrovalent bond
(C) coordinate covalent bond
(D) none of these
Answer:
(B) electrovalent bond

Question 2.
An example of an ionic compound : ( )
(A) MgCl₂
(B) NH₃
(C) H₂O
(D) all of these
Answer:
(D) all of these

Question 3.
The negative ion formed from chlorine atom is called : ( )
(A) cation
(B) anion
(C) neutral ion
(D) all of these
Answer:
(B) anion

Question 4.
The scientist who proposed the ionic bond is : ( )
(A) Lewis
(B) Rutherford
(C) Lavoiser
(D) Kossel
Answer:
(D) Kossel

Question 5.
The bond formed when two atoms share their valency electrons between them is ………………… . ( )
(A) Ionic
(B) Covalent
(C) Electrovalent
(D) Metallic
Answer:
(B) Covalent

Question 6.
The ion whose configuration is 1s²2s²2p⁶ is : ( )
(A) calcium ion
(B) potassium ion
(C) fluoride ion
(D) sodium ion
Answer:
(D) sodium ion

Question 7.
The factor that does not change when an atom is changed into ion: ( )
(A) charge
(B) atomic number
(C) no of electrons
(D) chemical property
Answer:
(D) chemical property

Question 8.
The number of electron pairs in the bond formation of oxygen molecule ( )
(A) 1
(B) 4
(C) 6
(D) 2
Answer:
(C) 6

Question 9.
An example of a covalent molecule: ( )
(A) Mgo
(B) Na₂S
(C) NaCl
(D) HCl
Answer:
(D) HCl

Question 10.
The electron present in outermost energy level of an atom is called ( )
(A) far most electron
(B) bond electron
(C) valence electron
(D) unpaired electron
Answer:
(A) far most electron

Question 11.
The bond present in oxygen molecules ( )
(A) ionic
(B) coordinate covalent
(C) sigma
(D) double
Answer:
(B) coordinate covalent

Question 12.
The reaction in which atoms combine to form a molecule is ( )
(A) exothermic
(B) endothermic
(C) reduction
(D) pyro-chemical total
Answer:
(B) endothermic

Question 13.
The total number of electrons In the bond formation of Nitrogen molecule :
(A) 4
(B) 6
(C) 8
(D) 2
Answer:
(D) 2

Question 14.
An example of a linear molecule: ( )
(A) SO₃
(B) CO₂
(C) H₂S
(D) H₂O
Answer:
(C) H₂S

Question 15.
The equilibrium distance between the nuclei of two atoms which form a covalent bond is called : ( )
(A) bond strength
(B) bond angle
(C) bond space
(D) bond length
Answer:
(D) bond length

Question 16.
In sodium chloride crystal the coordination number of Na is ( )
(A) 2
(B) 4
(C) 6
(D) 8
Answer:
(D) 8

Question 17.
The atoms possessing the following properties form cations ( )
(A) low ionization energy
(B) low electron affinity & low electro negativity
(C) high atomic size
(D) all the above
Answer:
(A) low ionization energy

Question 18.
The atoms of elements with: ( )
(A) high I.P & high electron affinity
(B) small atomic size
(C) high electronegativity
(D) all the above
Answer:
(C) high electronegativity

Question 19.
The number of electrons that a neutral sodium atom should lose in order to form a cation : ( )
(A) 1
(B) 2
(C) 6
(D) 3
Answer:
(B) 2

Question 20.
Group VII A elements are called: ( )
(A) noble elements
(B) alkali metals
(C) halogens
(D) alkaline earth metals
Answer:
(C) halogens

Question 21.
Which of these elements belongs to Group VI A In periodic table? ( )
(A) N
(B) O
(C) P
(D) F
Answer:
(D) F

Question 22.
The number of C-H covalent bonds present in Methane molecule. ( )
(A) 2
(B) 3
(C) 4
(D) 6
Answer:
(B) 3

Question 24.
The bond length In atoms between H-H molecules in (in A°) ( )
(A) 0.96
(B) 1.95
(C) 1.42
(D) 0.74
Answer:
(A) 0.96

Question 25.
The bond dissociation energy between H-O in H20 molecule (in KJ/mol)( )
(A) 298
(B) 460
(C) 390
(D) 151
Answer:
(B) 460

Question 26.
The bond dissociation energy between Cl-Cl in Cl2 molecule is (In KJ mol^-1) ( )
(A) 243
(B) 159
(C) 436
(D) 390
Answer:
(D) 390

Question 27.
The shape of NH₃ molecule is ( )
(A) tetra hedral
(B) trigonal pyramidal
(C) hexagonal
(D)’V-shaped
Answer:
(C) hexagonal

Question 28.
The bond angle in img of water molecule is ( )
(A) 109°28′
(B) 120°
(C) 107°48′
(D) 104°31’
Answer:
(B) 120°

Question 29.
In HCl molecule ‘1s’ orbital of H atom overlaps the following bond of chlorine atom: ( )
(A) 1p
(B) 2p
(C) 3p
(D) 3d
Answer:
(A) 1p

Question 30.
The phenomenon of intermixing of atomic orbitals of equal energy which are present in outer shells of atoms is called : ( )
(A) chronic
(B) hybridization
(C) grafting
(D) intermixing
Answer:
(B) hybridisation

Question 31.
The number of B-F bonds in BF₃ is ( )
(A) 3
(B) 2
(C) 1
(D) many
Answer:
(B) 2

Question 32.
The compound which has polar covalent bond is ( )
(A) NaCl
(B) HCl
(C) O₂
(D) N₂
Answer:
(A) NaCl

Question 33.
Since the forces of attractions among covalent molecules are ………………… most of the covalent compounds are gases or liquids at room temperature. ( )
(A) weak
(B) strong
(C) balanced
(D) none of these
Answer:
(B) strong

Question 34.
The type of bond that forms between two atoms depends is ……………… . ( )
(A) number of protons
(B) number of neutrons
(C) number of valence electrons
(D) number of paired electrons
Answer:
(C) number of valence electrons

Question 35.
The noble gas that has no octet configuration is ………………… . ( )
(A) Ar
(B) Rn
(C) Xe
(D) He
Answer:
(C) Xe

Question 36.
The type of overlap that takes place in NH₃ molecule is ( )
(A) s-s
(B) s-p
(C) p-p
(D) lateral
Answer:
(D) lateral

Question 37.
The bond formed due to overlap of orbitals is known as: ( )
(A) Ionic bond
(B) hydrogen bond
(C) covalent bond
(D) metallic bond
Answer:
(B) hydrogen bond

Question 38.
The number of s bonds in nitrogen molecule is ( )
(A) 0
(B) 1
(C) 2
(D) 3
Answer:
(C) 2

Question 39.
The bond formed between two atoms having the same electro-negative value ( )
(A) ionic bond
(B) hydrogen bond
(C) metallic bond
(D) Covalent bond,
Answer:
(B) hydrogen bond

Question 40.
The substance which has the highest melting point among the following: ( )
(A) NH₃
(B) CsF
(C) H₂O
(D) CHCl₃
Answer:
(A) NH₃

Question 41.
Strongest among the following bonds. ( )
(A) single bond
(B) double bond
(C) triple bond
(D) hydrogen bond
Answer:
(D) hydrogen bond

Question 42.
The bond formed when the orbitals undergo ‘end on end’ overlap is ( )
(A) N₂
(B) O₂
(C) H₂O
(D) H₃
Answer:
(A) N₂

Question 43.
A triple bond is present in the following molecule: ( )
(A) N₂
(B) O₂
(C) H₂O
(D) H₂
Answer:
(C) H₂O

Question 44.
The shape of water molecule is ………………………….. . ( )
(A) pyramidal
(B) tetra hedral
(C) trigonal bi pyramidal
(D) ‘v-shaped
Answer:
(C) trigonal bi pyramidal

Question 45.
Complete transfer of electrons from one atom to another lead to the formation of ( )
(A) Ionic bond
(B) Covalent bond
(C) Metallic bond
(D) none
Answer:
(A) Ionic bond

Question 46.
s – s overlap is found In ( )
(A) Cl₂
(B) F₂
(C) H₂
(D) N₂
Answer:
(B) F₂

Question 47.
The number of valency electrons in carbon atom (Z=6) is ( )
(A) 1
(B) 2
(C) 4
(D) 6
Answer:
(A) 1

Question 48.
p-p overlap is found In: ( )
(A) Br₂
(B) H₂
(C) HCl
(D) HBr
Answer:
(B) H₂

Question 49.
A molecule which has double bond : ( )
(A) Cl₂
(B) C₂H₄
(C) C₂H₂
(D) N₂
Answer:
(C) C₂H₂

Question 50.
An ionic compound among the following is ………………………. . ( )
(A) CaH₂
(B) HCl
(C) H₂O
(D) H₂S
Answer:
(D) H₂S

Question 51.
Number of electrons present In the penultimate shell of magnesium atom. ( )
(A) 2
(B) 8
(C) 18
(D) 32
Answer:
(B) 8

Question 52.
If the atomic number is 12, what kind of bond does it form with the other kind of atoms ? ( )
(A) covalent bond
(B) coordinate bond
(C) doesn’t form bond at all
(D) ionic bond
Answer:
(B) coordinate bond

Question 53.
Which of the following molecules show lone pair of electrons? ( )
(A) BeCl₂
(B) HCl
(C) NH₃
(D) PCl
Answer:
(C) NH₃

Question 54.
Which of the following pairs of molecules show triple bond? ( )
(A) C₂H₂ ; Cl₂
(B) C₂H₂; N₂
(C) NH₃; C₂H₄
(D) F₂, O₂
Answer:
(B) C₂H₂; N₂

Question 55.
A bond formed between a metal and non metal is …………………….. . ( )
(A) metallic bond
(B) ionic bond
(C) covalent bond
(D) hydrogen bond
Answer:
(D) hydrogen bond

Question 56.
In sodium chloride crystal each of Na⁺ ion is surrounded by ……………….. Cl ions. ( )
(A) 4
(B) 5
(C) 6
(D) 7
Answer:
(B) 5

Question 57.
bond is present between the two oxygen atoms in oxygen molecule. ( )
(A) single
(B) double
(C) triple
(D) hydrogen
Answer:
(D) hydrogen

Question 58.
Which one is the inert gas of the following
(A) Sodium
(B) Potassium
(C) Oxygen
(D) Neon
Answer:
(D) Neon

Question 59.
In the formation of MgCl₂ number of electrons transferred from Mg to Cl is
(A)1
(B) 2
(C) 3
(D) 4
Answer:
(B) 2

Question 60.
Factors affecting the formation of the ionic bond ( )
(A) atomic size
(B) ionization energy
(C) electron affinity
(D) all the above
Answer:
(A) atomic size

Question 61.
The bond angle In water molecules is ………………………… . ( )
(A) 180°
(B) 120°
(C) 109°28′
(D) 104°28′
Answer:
(C) 109°28′

Question 62.
Covalent compounds are generally soluble in ………………………… . ( )
(A) polar solvents
(B) non-polar solvents
(C) concentrated acids
(D) all solvents
Answer:
(A) polar solvents

Question 63.
Which of the following molecules contains a triple bond? ( )
(A) N₂
(B) C₂H₄
(C) PH₃
(D) CCl₄
Answer:
(B) C₂H₄

Question 64.
Which of the following can lose two electrons to attain the configuration of argon? ( )
(A) Mg
(B) Br
(C) Ca
(D) S
Answer:
(D) S

Question 65.
The formation of a chemical bond is accompanied by ( )
(A) decrease in energy
(B) increase in energy
(C) Neither decrease nor increase in energy
(D) The repulsion forces overcoming the attraction forces
Answer:
(B) increase in energy

Question 66.
Which one amongest the following is the weakest? ( )
(A) H-bond
(B) Vander Waals forces
(C) Three electrons bond
(D) Ion-dipole interaction
Answer:
(C) Three electrons bond

Question 67.
Which of the following is an ionic compound? ( )
(A) CO₂
(B) HCl
(C) H₂O
(D) CaO
Answer:
(C) H₂O

Question 68.
Covalent bond is formed by ( )
(A) electron transfer
(B) electron sharing
(C) electron donation
(D) electron acceptance
Answer:
(B) electron sharing

Question 69.
The number of valency electrons in carbon atom (z = 6) is ………………….. . ( )
(A) 0
(B) 2
(C) 4
(D) 6
Answer:
(A) 0

Question 70.
The total number of electrons that take part in forming the bonds in N₂ is ………………… .
(A)2
(B) 4
(C) 6
(D) 10
Answer:
(C) 6

Question 71.
Electrons in ………………………. shell are called valence electrons. ( )
(A) innermost
(B) outermost
(C) present in nucleus
(D) free
Answer:
(A) innermost

Question 72.
Except ………………………………. gas all other noble gases have octet In their valence shell.
(A) He
(B) Ne
(C) Ar
(D) Kr
Answer:
(B) Ne

Question 73.
Valence bond theory was proposed by …………………………… . ( )
(A) Lewls
(B) Milliken
(C) Sidgwick and Powell
(D) Bohr
Answer:
(B) Milliken

Question 74.
In ………………………. bonding the valence electrons are shared among all the atoms of the metallic elements. ( )
(A) covalent
(B) Ionic
(C) hybrid
(D) triple
Answer:
(C) hybrid

Question 75.
The chloride ion has a …………………. charge. ( )
(A) positive
(B) negative
(C) no charge
(D) depends upon reaction
Answer:
(B) negative

Question 76.
Na⁺ and Cl^– ions combine together to form an ………….. solid. ( )
(A) covalent
(B) ionic
(C) metallic
(D) non-metallic
Answer:
(C) metallic

Question 77.
Noble gases exist as individual …………………….. . ( )
(A) solids
(B) molecules
(C) atoms
(D) gases
Answer:
(C) atoms

Question 78.
The chlorine atom can ……………………… one electron to become a chloride ion. ( )
(A) lose
(B) gain
(C) retain
(D) donate
Answer:
(C) retain

Question 79.
Two atoms of nitrogen form a nitrogen molecule by sharing pairs of electrons. ( )
(A) one
(B) two
(C) three
(D) four
Answer:
(A) one

Question 80.
The chemical formula of ferric carbonate is …………………… . ( )
(A) Fe₂(CO₃)₂
(B) Fe(CO₃)₃
(C) Fe₂(CO₃)₃
(D) Fe₂CO₃
Answer:
(B) Fe(CO₃)₃

Question 81.
The chemical formula of zinc phosphate is ……………………….. . ( )
(A) Zn₃(PO₄)₃
(B) Zn₃PO₄
(C) Zn(PO₄)₃
(D) Zn(PO₄)₃
Answer:
(A) Zn₃(PO₄)₃

Question 82.
Molecular formula of methane is ………………………. . ( )
(A) CH₃
(B) CH₄
(C) C₂H₄
(D) C₂H₆
Answer:
(B) CH₄

Question 83.
H₂ molecule has the configuration of the inert gas …………………. . ( )
(A) He
(B) H₃O⁺
(C) H⁺
(D) OH^–
Answer:
(C) H⁺

Question 84.
A sigma bond is formed by ……………………….. overlap of orbitals. ( )
(A) axial
(B) co-axial
(C) side-way
(D) without overlapping
Answer:
(C) side-way

Question 85.
A pi bond is formed by …………………… overlap of orbitals. ( )
(A) axial
(B) lateral
(C) without overlapping
(D) can’t form
Answer:
(D) can’t form

Question 86.
………………………. overlap is present in F₂ molecule. ( )
(A) s-s
(B) s-p
(C) p-p
(D) none
Answer:
(D) none

Question 87.
The number of valence shell &ectrons that a group LA element loses to get octet configuration : ( )
(A) 7
(B) 2
(C) 1
(D) 2
Answer:
(C) 1

Question 88.
Noble gases belong to the following group : ( )
(A) Group VII A
(B) Group V A
(C) Group III A
(D) Group VIII A
Answer:
(D) Group VIII A

Question 86.
Any species attains stability when It has …………………….. number of electrons in its valence shell ( )
(A) 1
(B) 2
(C) 3
(D) 8
Answer:
(D) 8

Question 87.
The force of attraction between any two atoms or a group of atoms that results in a stable entity is known as : ( )
(A) chemical bond
(B) crystalline bond
(C) crystal lattice
(D) none of these
Answer:
(A) chemical bond

Question 88.
AH₂ is formed when element A’ reacts with hydrogen. Then the number of electrons in valence shell of ‘A’ are generally ………………………. . ( )
(A) 2
(B) 3
(C) 5
(D) 8
Answer:
(A) 2

Question 89.
Ionic compound in the following is ……………………. . ( )
(A) C₂H₆
(B) HCl
(C) NaCl
(D) H₂
Answer:
(C) NaCl

Question 90.
Number of moles of Oxygen need to produce 4 moles of water on reacting with 4 moles of Hydrogen gas is ……………………….. . ( )
(A) 1 mole
(B) 2 moles
(C) 3 moles
(D) 4 moles
Answer:
(B) 2 moles