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CHAPTER 4

Structure of Molecules

Encircle the most appropriate answer among the following options


1          Elements of group 18 are called:

(a) Noble metals

(b) Noble gases

(c) Noble

(d) None of these


2          Element attaining eight electrons in its outermost shell are called

(a) plet rule

(b) octet rule

(c) Both“A” and “B”

(d) None of these


3          The force of attraction which holds the molecule atom together is called

(a) Ionic bond

(b) Covalent bond

(c) hydrogen bond

(d) Chemical bond


4          Every atom tries to attain

(a) Maximum energy

(b) Stable energy

(c) Minimum energy

(d) Covalent energy


5          Which force of attraction is present between positive and negative ions?

(a) Homolytic

(b) Electrostatic

(c) Electro elastic

(d) Electronic


6          A bond formed by the complete transfer of electron from one atom to other is called

(a) Chemical bond

(b) Covalent bond

(c) Ionic bond

(d) metallic bond


7          Hydrogen acquires the electronic configuration like

(a) Xe

(b) Ne

(c) He

(d) Ar


8          In non polar covalent bond the bonded atoms share the electrons

(a) Not equally

(b) Equally

(c) Differently

(d) Oppositely


9          In polar covalent bonds molecules are

(a) Homo atomic

(b) Tri atomic

(c) Hetero atomic

(d) Mono atomic


10        Dipole-dipole interactions are

(a) Magnetic

(b) Electric

(c) Neutral

(d) Stable


11        Energy required to break forces of one mole liquid HCI molecule is

(a) 16kJ

(b) 15kJ

(c) 17kJ

(d) 18kJ


12        The density of ice at 0°C is

(a) 0.917gcm-3

(b) 0.719 gcm-3

(c) 0.197 gcm-3

(d) 0.0917 gcm3


13        One form of polymer used industrially as a adhesive

(a) Epoxy

(b) Explosive

(c) Synthetic

(d) Natural


14        Epoxy is a polymer formed by the resin and

(a) Shiner

(b) Softener

(c) Hardener

(d) Thinner


15        Substance have the tendency to gain electrons and anions

(a) Metals

(b) Non-metals

(c) Metalloids

(d) Halogens


16        Which properties are affected by hydrogen bonding

(a) Physical

(b) Chemical

(c) lonic

(d) Metallic


17        Which scientist had given the idea of octaves in periodic table?

(a) Mendeleev

(b) Al-razi

(c) Newland

(d) Dobereiner


18        Covalent bond involves the

(a) Donation of electrons

(b) Acceptance of electrons

(c) Sharing of electrons

(d) Repulsion of electrons


19        Triple covalent bond involves how many numbers of electrons?

(a) Eight

(b) Six

(c) Four

(d) Only three


20        Which among of the following is an electron deficient molecule?

(a) NH3

(b) BF3

(c) N2

(d) O2


21        Which one of the following is the weakest force among the atoms?

(a) Ionic force

(b) Metallic force

(c) Intermolecular force

(d) Covalent force


22        Which atom after losing one electrons attains electronic configuration of noble gas.

(a) He

(b) Ne

(c) Ar

(d) Na


23        How many electrons are there in the outer most shell of Cl-atom after it gains one electron in its values shell?

(a) 6

(b) 7

(c) 8

(d) 10


24        Which ionic species has same electronic configuration as noble gas Ar.

(a) Na

(b) K+

(c) Cl

(d) Both (b) and (c)


25        An ionic bond is formed when elements of group 1 react with elements of group:

(a) 12

(b) 14

(c) 18

(d) 17


26        A dative bond is formed between ammonia and borontrifluoride the donar atom is:

(a) Fluorine

(b) Boron

(c) Hydrogen

(d) Nitrogen


27        Indicate which molecule is nonpolar:

(a) NaCl

(b) KBr

(c) CO2

(d) Kl


28        Mark the molecule which possess four covalent bonds.

(a) N2

(b) C2H4

(c) CH4

(d) C2H2


29        Which one of molecule is maximum polar:

(a) HCI

(b) HF

(c) NaF

(d) H2O


30        Electronegativity difference between hydrogen and chlorine is:

(a) 1.7

(b) 0.8

(c) 1.0

(d) 0.5


31        Indicate which of the following has hydrogen bonding:

(a) C2H6

(b) CH4

(c) NH3

(d) HCl


32        Is2, 252, 2p2 is the electronic configuration of which atom.

(a) Li

(b) B

(c)N

(d) C


33        Identify the compound which is soluble in water:

(a) C6H6

(b) CH4

(c) C2H4

(d) NaCl


34        The bond dissociation energy of H-Cl molecule

(a) 430 kj/mole

(b) 340 kj/mole

(c) 403 kj/mole

(d) 304 kj/mole


35        On the pauling scale fluorine has been given an electronegative value of:

(a) 2.5

(b) 3.0

(c) 3.5

(d) 4.0


36        The density of ice at 0°C is:

(a) 0.9179 cm

(b) 1.0 gem

(c) 0.7199 cm3

(d) 0.179 cm3


37        Which molecule contains a single covalent bond?

(a) CH4

(b) C2H2

(c) C2H4

(d) O2


38        The difference between electronegativities of hydrogen and fluorine

(a) 1.0

(b) 3.0

(c) 2.0

(d) 1.8


39        The electronegativity of hydrogen atom is

(a) 2.0

(b) 2.2

(c) 3.0

(d) 2.1


40        The energy required to break the intermolecular forces between one mole of liquid hydrogen chloride molecule to convert into gas is

(a) 22kJ

(b) 132 kJ  

(c) 32 kj

(d) 17 kJ


41        the energy required to break the chemical bond between hydrogen and chlorine atoms in 1 mole of hydrogen chloride is

(a) 320 kJ

(b) 430 kJ

(c) 365 kJ

(d) 410 kJ


42        The boiling point of water is

(a) 0°C

(b) 35°C

(c) 100°c

(d) 25°C


43        The boiling point of alcohol is

(a) 44°C

(b) 19°C

(c) 53°C

(d) 78°C


44        Epoxy adhesives are stable to heat up to a temperature of

(a) 177°C

(b) 225°C

(c) 320°C

(d) 135°C


45        The density of water at 0°C is

(a) 2.0 g/cm

(b) 1.0 g/cm

(c) 0.917 g/cm3

(d) 1.17 g/cm


46        The boiling point of NaCl is

(a) 318°C

(b) 1413°C

(c) 1215°C

(d) 1510°C


47        Which of the following is an example of covalent compound?

(a) C6H12O6

(b) CH4

(c) H2SO4

(d) All of these


48        Every atom has a natural tendency to achieve electrons in its valence shell


(a) 2 or 6

(b) 2 or 8

(c) 2 or 4

(d) 2 or 10


49        The formation of ionic bond between two ions is due to

(a) Hydrogen bonding

(b) Electrostatic forces

(c) Metallic forces

(d) All of them


50        How many valence shell electrons are there in Na+ ion?

(a) 8

(b) 9

(c) 10

(d) 11