Chemical Bonding and Reactions. We covered all the Chemical Bonding and Reactions in this post for free so that you can practice well for the exam.
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MCQ on Chemical Bonding and Reactions for Students
Most explosions in mines occur due to the mixing of
(a) hydrogen with oxygen
(b) oxygen with acetylene
(c) methane with air
(d) carbon dioxide with ethane
Option b – oxygen with acetylene
If a limestone piece is dipped in water, a bubble evolves. The bubbling is due to ( Chemical Bonding and Reactions MCQ )
(a) hydrogen
(b) oxygen
(c) water vapor
(d) carbon dioxide
Option d – carbon dioxide
Which one of the following reducing agents can also act as an oxidizing agent?
(a) H₂
(b) H₂S
(c) SO2
(d) HI
Option c – SO2
A woman desires to clean the surface of her gold ornaments with a chemical approach. For this, she requires to use ( Chemical Bonding and Reactions MCQ )
(a) aqua-regia
(b) concentrated H₂SO4
(c) concentrated NaOH
(d) sodium thiosulphate solution
Option a – aqua-regia
Among the elements Zn, Ga, Ge, and As, the one with the lowest first ionization energy is
(a) As
(b) Zn
(c) Ga
(d) Ge
Option c – Ga
The valency of an element depends upon the ( Chemical Bonding and Reactions MCQ )
(a) total number of protons in an atom
(b) the mass number of an atom
(c) the total number of neutrons in an atom
(d) the total number of electrons in the outermost shell of the atom
Option d – the total number of electrons in the outermost shell of the atom
The octet rule is not valid for which one of the following molecules?
(a) CO2
(b) H₂S
(c) NH3
(d) BF3
Option d – BF3
The rusting of the iron nail ( Chemical Bonding and Reactions MCQ )
(a) decreases its weight
(b) increases its weight
(c) does not affect weight but iron is oxidized
(d) does not affect weight but iron is reduced
Option b – increases its weight
Which one of the following when dissolved in H20 gives a hissing sound?
(a) Limestone
(b) Slaked lime
(c) Sodalime
(d) Quicklime
Option d – Quicklime
Consider the following statements: 1. Maximum covalency of carbon is 4, whereas the maximum covalency of silicon is 6. 2. The maximum covalency of an element is limited to 6. Which of the statements given above is/are correct? ( Chemical Bonding and Reactions MCQ )
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Option a – 1 only
What are the types of bonds present in CuSO4.5H₂O?
(a) Electrovalent and covalent
(b) Electrovalent and coordinate covalent
(c) Electrovalent, covalent, coordinate covalent and hydrogen bonds
(d) Covalent and coordinate covalent
Option c – Electrovalent, covalent, coordinate covalent and hydrogen bonds
Consider the following equation for the formation of ammonia from nitrogen and hydrogen: N₂ + 3H₂ → 2NH3 How many hydrogen molecules are required to react with 100 molecules of nitrogen? ( Chemical Bonding and Reactions MCQ )
(a) 100
(b) 200
(c) 300
(d) 400
Option c – 300
As compared to covalent compounds, electrovalent compounds, generally have
(a) low melting point and low boiling point
(b) low melting point and high boiling point
(c) high melting point and low boiling point
(d) high melting point and high boiling point
Option d – high melting point and high boiling point
In the KMnO4 molecule, the oxidation states of the elements Potassium (K), Manganese (Mn), and Oxygen (O) are respectively ( Chemical Bonding and Reactions MCQ )
(a) +1, +5,-2
(b) +1, +7,-2
(c) 0, 0, 0
(d) +1, +7,0
Option b – +1, +7,-2
Which one of the following is a chemical change?
(a) Cutting of hair
(b) Graying of hair naturally
(c) Swelling of resin in water
(d) Cutting of fruit
Option b – Graying of hair naturally
Consider the following reaction: CH4 +2O2 -> CO₂ + 2H₂O Which of the following about the reaction given above is/ are correct? 1. Carbon is oxidized. 2. Hydrogen is oxidized. 3. Hydrogen is reduced. 4. Carbon is reduced. Select the correct answer using the code given below : ( Chemical Bonding and Reactions MCQ )
(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 2 and 4 only
Option b – 1 and 2 only
The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium?
(a) One
(b) Two
(c) Three
(d) Four
Option b – Two
A redox reaction is one in which ( Chemical Bonding and Reactions MCQ )
(a) both substances is reduced
(b) both the substance are oxidized
(c) acid is neutralized by the base
(d) one substance is oxidized while the other is reduced
Option d – one substance is oxidized while the other is reduced
The equation Cu+xHNO3 → Cu(NO3)2 +YNO2 + 2H₂O The values of x and y are
(a) 3 and 5
(b) 8 and 6
(c) 4 and 2
(d) 7 and 1
Option c – 4 and 2
Which one of the following statements is correct? ( Chemical Bonding and Reactions MCQ )
(a) The oxidation number for hydrogen is always zero.
(b) The oxidation number for hydrogen is always +1.
(c) The oxidation number for hydrogen is always -1.
(d) Hydrogen can have more than one oxidation number.
Option d – Hydrogen can have more than one oxidation number
Which one of the following elements is least reactive with water?
(a) Lithium
(b) Sodium
(c) Potassium
(d) Cesium
Option a – Lithium
The ionization energy of hydrogen atom in the ground state is ( Chemical Bonding and Reactions MCQ )
(a) 13.6 MeV
(b) 13.6 eV
(c) 13.6 Joule
(d) Zero
Option b – 13.6 eV
Which one of the following gases is placed second in respect of abundance in the Earth’s atmosphere?
(a) Oxygen
(b) Hydrogen
(c) Nitrogen
(d) Carbon dioxide
Option a – Oxygen
In which of the following compounds, all bond lengths are NOT equal? ( Chemical Bonding and Reactions MCQ )
(A) XeF4
(B) C₂H₂
(C) BF4
(D) CH4
Option b – C₂H₂
Which of the following have the same shape? (1) CO2 (II) SO₂ (III) H₂S (IV) SiF4 (V) 03
(A) (I) and (II)
(B) (II), (III) and (V)
(C) (I), (III), and (V)
(D) (II), (III) and (IV)
Option b – (II), (III) and (V)
Among the following, which compound will show the highest lattice energy? ( Chemical Bonding and Reactions MCQ )
(A) KF
(B) NaF
(C) LiF
(D) RbF
Option c – LiF
Which of the following statements is CORRECT?
(A) The promotion of an electron to the next orbital is an essential condition for hybridization to take place.
(B) The number of hybrid orbitals is twice the number of atomic orbitals that are hybridized.
(C) The hybrid orbitals are always equivalent in energy and shape.
(D) It is necessary that only half-filled orbitals should participate in hybridization.
Option c – The hybrid orbitals are always equivalent in energy and shape
The compound that will have a permanent dipole moment among the following is ………. ( Chemical Bonding and Reactions MCQ )
(A) 1,4-dichlorobenzene
(B) trans-1,2-dichloroethene
(C) 1,3-dichlorobenzene
(D) trans-1-chloropropene
Option d – trans-1-chloropropene
Which of the following is CORRECTLY matched?
(A) BF3 – a polar molecule with non-polar bonds
(B) CCl4 – a polar molecule with polar bonds
(C) CHCl3 – a polar molecule with polar bonds
(D) H₂S – non-polar molecule with polar bonds
Option c – CHCl3 – a polar molecule with polar bonds
The formation of HF molecule involves ……….
(A) s-p sigma bond
(B) s-s sigma bond
(C) s-p pi bond
(D) p-p sigma bond
Option a – s-p sigma bond
Statement (1): The bonding molecular orbital has greater electron density in the region between the two nuclei of bonded atoms whereas the antibonding molecular orbital has lesser electron density in the region between the two nuclei of the atoms. Statement (2): The bonding molecular orbital has higher energy and higher stability whereas the antibonding molecular orbital has lower energy and lower stability as compared to the combining atomic orbitals. Select the most appropriate option.
(A) Both statements are correct.
(B) Both statements are incorrect.
(C) Statement (1) is correct but statement (2) is incorrect.
(D) Statement (1) is incorrect but statement (2) is correct.
Option c – Statement (1) is correct but statement (2) is incorrect.
The smallest bond angle is present in ………
(A) SF6
(B) CH4
(C) BeF2
(D) BF3
Option a – SF6
When orbitals of two atoms come close to forming a bond, their overlap may be positive, negative, or zero. Which of the following will result in zero overlaps if the z-axis is the internuclear axis?
(A) Px + Py
(B) + Pz + s
(C) s + s
(D) Pz + Pz
Option a – Px + Py
In which of the following compounds, the central atom has two lone pairs of electrons?
(A) SF4
(B) BrFs
(C) SO₂
(D) XeF4
Option d – XeF4
According to VSEPR theory, ………. molecule has a square pyramidal shape.
(A) SF6
(B) BrF3
(C) SeF6
(D) IF5
Option d – IF5
Assertion: p-nitrophenol has a lower boiling point than o-nitrophenol. Reason: In p-nitrophenol, there is intermolecular hydrogen bonding while in o-nitrophenol, there is intramolecular hydrogen bonding.
(A) Assertion and Reason are true. The reason is the correct explanation of the Assertion.
(B) Assertion and Reason are true. The reason is not the correct explanation of the Assertion.
(C) The assertion is true, and the Reason is false.
(D) The assertion is false, Reason is true.
Option d – The assertion is false, Reason is true.
From the following, which substance will have the highest boiling point?
(A) He
(B) CsF
(C) NH3
(D) CHCI3
Option b – CsF
Which of the following will NOT form a sigma bond if the x-axis is considered as the internuclear axis?
(A) 1s and 1s
(B) 1s and 2px
(C) 2py and 2py
(D) 1s and 2s
Option c – 2py and 2py
The number of bond pair(s) and lone pair(s) of electrons on Xe atom in XeF₂ is respectively …….
(A) 2 and 1
(B) 2 and 2
(C) 3 and 2
(D) 2 and 3
Option d – 2 and 3
Among the following, ………. is an odd electron molecule.
(A) boron trifluoride
(B) nitric oxide
(C) carbon monoxide
(D) lithium chloride
Option b – nitric oxide
In which of the following, molecules are arranged in decreasing order of bond angle?
(A) BCl3> SiF4> BrF5
(B) H₂O> BeF2 > BF3
(C) BrF5 > CO₂ > SiF4
(D) BeF₂> H₂O > BCl3
Option a – BCl3> SiF4> BrF5
Which of the following molecules is diamagnetic?
(A) B₂ and N₂
(B) N₂ and F₂
(C) O₂ and F₂
(D) B₂ and O₂
Option b – N₂ and F₂
Which of the following is INCORRECT for the IF7 molecule?
(A) The iodine atom undergoes sp³d³ hybridization.
(B) The bond angle between two equatorial fluorine atoms is 72°.
(C) The shape of the molecule is pentagonal bipyramidal.
(D) Two lone pairs of electrons occupy axial positions.
Option d – Two lone pairs of electrons occupy axial positions.
Which of the following is a linear molecule?
(A) HgCl₂
(B) BH3
(C) OF₂
(D) SnCl₂
Option a – HgCl₂
The maximum number of lone pairs of electrons on the central atom is present in which of the following species?
(A) CIO3
(B) I3
(C) ASCl3
(D) H₂S
Option b – I3
The number of unpaired electrons in a diatomic ion of an element with atomic number 6 and having a charge of -2 is ……..
(A) 0
(B) 1
(C) 2
(D) 3
Option a – 0
Which of the following statements is NOT CORRECT from the viewpoint of molecular orbital theory?
(A) Ne₂ is not a stable molecule.
(B) He₂ is not stable but He is expected to exist.
(C) The bond strength of N₂ is maximum amongst the homonuclear diatomic molecules of elements belonging to the second period.
(D) The bond order of Li₂ is the same as that of 0₂.
Option d – The bond order of Li₂ is the same as that of 0₂.
The number of electrons in the valence shell of the sulphur atom in sulphur dichloride and sulphur hexafluoride is…….. respectively.
(A) 10, 12
(B) 8, 12
(C) 6, 10
(D) 12, 12
Option b – 8, 12
Which of the following is INCORRECT regarding Li₂ molecule?
(A) It is diamagnetic.
(B) Its bond order is 1.
(C) It has 4 electrons in bonding molecular orbitals.
(D) It is unstable and does not exist.
Option d – It is unstable and does not exist.
The percentage of p-character in the hybrid orbitals of graphite and diamond are respectively ………
(A) 25 and 75
(B) 50 and 75
(C) 67 and 75
(D) 33 and 75
Option c – 67 and 75
Which of the following is the CORRECT statement?
(A) The magnitude of H-bonding does not depend on the physical state of the compound.
(B) The H-bond is much stronger than the covalent bond.
(C) A coordinate bond is a type of covalent bond in which both the electrons in the shared pair come from one atom.
(D) A covalent bond in which electrons are shared unequally is called a nonpolar covalent bond.
Option c – A coordinate bond is a type of covalent bond in which both the electrons in the shared pair come from one atom.
According to MOT, the diatomic molecule that would be stabilized by the removal of an electron is ……….
(A) 0₂
(B) C₂
(C) N₂
(D) B2
Option a – 0₂
Consider the following statements. I. Formation of cations occurs by loss of electrons. II. The formation of anions occurs through the gain of electrons. Which of the statement given above is/are correct?
(a) Only I
(b) Only II
(c) Both I and II
(d) None of these
Option c – Both I and II
Which of the following contains both ionic and covalent bonds?
(a) H₂O
(b) NaOH
(c) C6H6
(d) CO₂
Option b – NaOH
How many covalent bonds are present in a Chloropropane molecule having the molecular formula, C3H₂CI?
(a) 6
(b) 8
(c) 9
(d) 10
Option d – 10
Which one among the following is a covalent compound?
(a) Calcium chloride
(b) Magnesium fluoride
(c) Sodium chloride
(d) Carbon tetrachloride
Option d – Carbon tetrachloride
Molten NaCl is a good conductor of electricity due to
(a) free electrons
(b) free ions
(c) free molecules
(d) None of these
Option b – free ions
With reference to ionic compounds, consider the following statements. I. Ionic compounds are insoluble in alcohol. II. ionic compounds in the solid state are good conductors of electricity. Which of the statement given above is/are correct?
(a) Only I
(b) Only Il
(c) Both I and II
(d) Neither I nor II
Option a – Only I
Study the following statements. I. A bond formed by the transfer of electrons between atoms of an element is called an ionic bond. II. A bond formed by sharing of electrons between atoms of the elements is called a covalent bond. Which of the statements given above is/are correct?
(a) Only I
(b) Only Il
(c) I and II
(d) None of the above
Option c – I and II
Which of the following bond is the weakest?
(a) Coordinate bond
(b) Hydrogen bond
(c) Vander Waals’ forces
(d) Covalent bond
Option c – Vander Waals’ forces
A metallic bond is
(a) ionic
(b) polar covalent
(c) non-polar covalent
(d) electrostatic in nature
Option d – electrostatic in nature
If the formula of the sodium salt of an anion X is Na2X, then the formula of its aluminum salt would be
(a) AIX
(b) AIX3
(c) Al₂X3
(d) Al3X₂
Option c – Al₂X3
The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium?
(a) One
(b) Two
(c) Three
(d) Four
Option b – Two
ionic solids
(a) are hard and brittle.
(b) are generally high melting points.
(c) can be melted to form liquids that are electrical conductors.
(d) All of the above
Option d – All of the above
Electrovalent compounds’
(a) melting points are low.
(b) boiling points are low.
(c) conduct current in a fused state.
(d) insoluble in a polar solvent.
Option c – conduct current in a fused state
The electrovalent compounds are made up of
(a) electrically charged molecules.
(b) neutral molecules.
(c) neutral atoms.
(d) electrically charged atoms or groups of atoms.
Option d – electrically charged atoms or groups of atoms
The electrovalent bond formation depends on
(a) ionization energy
(b) electron affinity
(c) lattice energy
(d) All of the above
Option d – All of the above
Examples of ionic bonds are
(a) NaCl, KCI, MgF2, CaCl₂
(b) H₂, Cl₂, O2, N₂, CH₂
(c) SO2, SO3, 03
(d) H₂O, NH3
Option a – NaCl, KCI, MgF2, CaCl₂
An atom of sodium loses one electron and a chlorine atom accepts one electron. This results in the formation of sodium chloride molecules. This type of molecule will be
(a) coordinate
(b) covalent
(c) electrovalent
(d) metallic bond
Option c – electrovalent
What happens when a chemical bond is formed?
(a) Energy is always absorbed.
(b) Energy is always released.
(c) More energy is released than it is absorbed.
(d) Energy is neither released nor absorbed.
Option b – Energy is always released
When a chemical bond is formed, there is a decrease in
(a) kinetic energy
(b) potential energy
(c) repulsive force
(d) attractive force
Option b – potential energy
Which of the following theory said that bond is formed between two atoms either by sharing or transfer of valence electrons?
(a) Valence shell electron pair repulsion
(b) Molecular orbital theory
(c) Valence bond theory
(d) Electronic theory of chemical bonding
Option d – Electronic theory of chemical bonding
The product of equivalent weight and valency of an element is equal to
(a) vapor density
(b) specific heat
(c) atomic weight
(d) molecular weight
Option d – molecular weight
The methane molecule has
(a) a double bond
(b) a triple bond
(c) a single covalent bond
(d) None of the above
Option c – a single covalent bond
In a double covalent bond, there is a sharing of
(a) two electrons
(b) four electrons
(c) six electrons
(d) three electrons
Option b – four electrons
Assertion (A) Double bonds cause more repulsion than single bonds. Reason (R) Triple bonds cause more repulsion than double bonds. Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option b – Both A and R are true, but R is not the correct explanation of A
Proton plays an important role in which type of bonding?
(a) Electrovalent
(b) Hydrogen
(c) Covalent
(d) Coordinate
Option d – Coordinate
The type of bond formed during the hydration of the cation is
(a) ionic
(b) covalent
(c) electrostatic
(d) dative bond
Option d – dative bond
The bond which is present between water molecules is
(a) electrovalent bond
(b) covalent bond
(c) hydrogen bond
(d) van der Waal’s bond
Option c – hydrogen bond
Liquid water is denser than ice due to
(a) higher surface tension
(b) hydrogen bonding
(c) Vander Waals’ force
(d) covalent bonding
Option b – hydrogen bonding
Covalent compounds are generally
(a) soluble in water
(b) insoluble in water
(c) ionize in water
(d) hydrolyze in water
Option b – insoluble in water
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