Chemistry Class 9 Chapter 4 Important mcqs Federal Board 2023
9th Chemistry fbise
1. Atoms react with each other to attain ____.
A) Power
B) Stability
C) Inertia
D) None of them
Answer: B (Stability)
2) The ____ have ns2, np6 electronic configuration in the outermost shell.
A) Noble gases
B) Micro gases
C) Compressed gases
D) All of them
Answer: A (Noble gases)
3) The tendency of atoms to have ___ electron configuration in their valence shell while bonding, is called octet rule.
A) Four
B) Five
C) Eight
D) Nine
Answer: C (Eight)
4) Helium contains two electrons in its valence shell and is also chemically ____.
A) Very reactive
B) Inert
C) Colloidal
D) Imperfect
Answer: B (Inert)
5) The tendency of some atoms to attain ___ electron configuration in their valence shell while bonding, is called the duplet rule.
A) One
B) Seven
C) Two
D) None of them
Answer: C (Two)
6) The force of attraction that holds the atoms together in substances is called ___ .
A) Gelling
B) Joints
C) Booking
D) Chemical bonds
Answer: D (Chemical bonds)
7) Atoms other than the ____ have the ability to react with other elements.
A) Noble gases
B) Metals
C) Metalloids
D) None of them
Answer: A (Noble gases)
8) The bond formed due to the complete transfer of electrons is called ___
A) Metallic bond
B) Co-ordinate bond
C) Ionic bond
D) Nelson’s bond
Answer: C (Ionic bond)
9) When one atom loses an electron it forms ___.
A) Bond
B) Cation
C) Negative ion
D) None of them
Answer: B (Cation)
10) When an atom gains an electron it forms ___.
A) Anion
B) Positive ion
C) Alpha rays
D) Beta rays
Answer: A (Anion)
11) Compounds that consist of ions held by electrostatic forces are called ____ compounds.
A) Metallic
B) Gaseous
C) Mustard
D) Ionic
Answer: D (Ionic)
12) Ionic compounds as a whole are electrically ____.
A) Double positive
B) Beta rays
C) Neutral
D) Protons
Answer: C (Neutral)
13) Ionic bonds are also called ____ bonds.
A) Electro-valent
B) Dative
C) Co-ordinate
D) None of them
Answer: A (Electro-valent)
14) The bond formed by the mutual sharing of electrons is called __.
A) Covalent bond
B) Electro-valent bond
C) Metallic bond
D) All of these
Answer: A (Covalent bond)
15) Lone pairs are pairs of valence electrons that are ___
A) Shared
B) Not shared
C) Transferred
D) All of these
Answer: B (Not shared)
16) A covalent bond formed by the mutual sharing of one electron pair is called ___ covalent bond.
A) Lone
B) Single
C) Mono
D) Co-ordinate
Answer: B (Single)
17) F2 molecule is an example of ___ covalent bond.
A) Double
B) Quadruple
C) Single
D) Ionic
Answer: C (Single)
18) Double covalent bond is formed by the sharing of ___ electron pairs.
A) One
B) Six
C) Zero
D) Two
Answer: D (Two)
19) N3 molecule is an example of ___ covalent bond.
A) Co-ordinate
B) Poly
C) Triple
D) None of them
Answer: C (Triple)
20) Triple covalent bond is formed by the mutual sharing of __ electron pairs.
A) Three
B) Single
C) Six
D) Eight
Answer: A (Three)
21) Which of the following contains a double covalent bond?
A) N2
B) O2
C) Na2
D) He
Answer: B (O2)
22) When the electronegativity difference between two elements is greater than 1.7 then the bond formed is called __
A) Ionic bond
B) Metallic bond
C) Helium bond
D) All of these
Answer: A (Ionic bond)
23) When two identical atoms share electron pairs, then both the atoms exert the same amount of force on the shared electron pairs such a covalent bond is called ___ covalent bond.
A) Polar
B) Non-polar
C) Electro-static
D) Neutral
Answer: B (Non-polar)
24) When two different atoms share electron pairs, then both atoms exert a different amount of force on the shared electron pairs such a covalent bond is called ___ covalent bond.
A) Polar
B) Non-polar
C) Electro-valent
D) Non-ionized
Answer: A (Polar)
25) Inter-molecular forces are __ than ionic and covalent bonds.
A) Volatile
B) Weaker
C) Static
D) Rarer
Answer: B (Weaker)
26) Dipole-dipole interactions occur between ___ molecules.
A) Non-ionic
B) Electro-valent
C) Polar
D) None of them
Answer: C (Polar)
27) Which of the following atom will not form an ion
A) A (Atomic number = 19)
B) B (Atomic number = 21)
C) C (Atomic number = 14)
D) D (Atomic number = 18)
Answer: D (Atomic number = 18)
28) An atom with atomic number = 3 will form a ___.
A) Beta ray
B) Gamma ray
C) Cation
D) None of them
Answer: C (Cation)
29) Tin belongs to Group IV A it contains __ valence electrons.
A) 14
B) 24
C) 4
D) 34
Answer: C (4)
30) Find out the ionic compound.
A) F2
B) H2O
C) NaCl
D) None of them
Answer: C (NaCl)
31) Aqueous solutions of ___conduct electricity.
A) Ionic compounds
B) Hydrogen compounds
C) Nitrate compounds
D) All of them
Answer: A (Ionic compounds)
32) In water, the ions are ___ about in the aqueous solution.
A) Free to move
B) Stagnant
C) Rotating
D) Horrific
Answer: A (Free to move)
33) Which of the following will form an ionic compound?
A) H, O
B) K, Cl
C) H, Cl
D) C, O
Answer: B (K,Cl)
34) In CsCl every Cs+ ion is surrounded by ____ − Cl ions.
A) 18
B) 28
C) 8
D) 19
Answer: C (8)
35) Both NaCl and CsCl form colorless __ crystals.
A) Rectangular
B) Pyramidal
C) Trigonal
D) Cubic
Answer: D (Cubic)
36) At room temperature almost all the ionic compounds are ____ solids.
A) Metallic
B) Crystalline
C) Molecular
D) None of them
Answer: B (Crystalline)
37) Ionic compounds have ____ melting points.
A) Immeasurable
B) Low
C) Transitional
D) High
Answer: D (High)
38) Sodium chloride’s melting point is __ ˚C.
A) 80˚C
B) 934 ˚C
C) 801 ˚C
D) 108 ˚C
Answer: C (801 ˚C)
39) The adhesive function of paints and dyes is due to ____ bonding.
A) Hydrogen
B) Electric
C) Peculiar
D) Metallic
Answer: A (Hydrogen)
40) There are _ electrons in the outermost shell of inert gases.
A) 8
B) 18
C) 05
D) 03
Answer: A (8)
41) Which of the following will tend to achieve two electron configuration in the valence shell?
A) Sc
B) Li
C) Pb
D) Po
Answer: B (Li)
42) All of the following pairs of elements will form a covalent bond except___
A) H, O
B) C, O
C) Na, Cl
D) H, Cl
Answer: C (Na, Cl)
43) The interaction of electron-deficient hydrogen and lone pair on a nearby highly electronegative atom such as ____is called a hydrogen bond. Select the correct set of elements.
A) S, N, P
B) Na, Cl, Ar
C) N, O, F
D) None of them
Answer: C (N, O, F)
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