Free Bond Energy MCQs with Answers

• A. released when a bond is formed between two ions
• B. required to melt one mole of a covalent solid
• C. required to break one mole of a particular bond in the gaseous state
• D. stored in the nucleus of an atom

Explanation: Because bond breaking is always endothermic, bond energy values are positive, and the same amount is released when the bond re-forms.

• A. single greater than double greater than triple
• B. all three are equal
• C. double greater than triple greater than single
• D. triple greater than double greater than single

Explanation: More shared pairs mean a greater attraction between the nuclei and the bonding electrons, so the triple bond is the strongest and also the…

• A. the energy released in forming new bonds exceeds the energy absorbed in breaking old ones
• B. the energy absorbed in breaking bonds exceeds the energy released in forming them
• C. no bonds are broken
• D. the products are gases

Explanation: Breaking bonds always costs energy and forming them always releases it, so the sign of the overall enthalpy change is decided by which…

• A. single, double, triple
• B. triple, double, single
• C. double, single, triple
• D. all are equal

Explanation: More shared pairs pull the nuclei closer, so a triple bond is shorter than a double and a double shorter than a single, with carbon to…

• A. the bond length increases
• B. the bond length decreases and the bond order rises
• C. the atoms become larger
• D. the electronegativity difference falls to zero

Explanation: Shorter bonds hold the nuclei closer to the shared electrons, so more energy is needed to separate them, and each extra shared pair…

• A. 110Kcal/mol
• B. 106Kcal/mol
• C. 104Kcal/mol
• D. 150KJcal/mol

Explanation: The H-H bond dissociation energy is about 436 kJ mol^-1, which is approximately 104 kcal mol^-1 because 1 kcal = 4.184 kJ and 436 kJ…

• A. 456kJ/mol
• B. 562kJ/mol
• C. 281kJ/mol
• D. None

Explanation: The H-F bond is very strong, with a bond dissociation energy of approximately 562 kJ/mol, so option b is the closest value.

• A. 75.2pm
• B. 75.3pm
• C. 75.5pm
• D. 75.4pm

Explanation: The equilibrium internuclear distance in a hydrogen molecule is approximately 75.4 pm, where attractive and repulsive forces balance to…

• A. EA. Higher than individual
• B. Lesser than individual
• C. No change
• D. Impossible to predict

Explanation: When atoms form a stable compound, energy is released and the bonded system has lower potential energy than the separate atoms.

• A. Fluorine
• B. Chlorine
• C. Iodine
• D. Bromine

Explanation: The F-F bond is unusually weak because the small fluorine atoms bring their lone pairs into strong repulsion, while the larger halogens…

• A. CH3 - F
• B. CH3 - I
• C. CH3 - Cl
• D. CH3 - Br

Explanation: This is because the strength of the bond between an alkyl halide and an amine is determined by the polarity of the bond, with more polar…

• A. 301 kJ mol−1
• B. 320 kJ mol−1
• C. 309 kJ mol−1
• D. 280 kJ mol−1

Explanation: To find the average S-F bond energy in SF6, we need to use the concept of bond energies and the given standard heat of formation values.

• A. 4q3 − q1 − 2q2
• B. q1 + q2 − q3
• C. q1 + 2q2 − 4q3
• D. q1 + 4q2 − 4q3

Explanation: C(s) + 2H2(g) → CH4(g); ∆H = ? C(s) → C(g); ∆H1 = q1 H2(g) → 2H(g); ∆H2 = 2q2 ∆H = q1 + 4q2 − 4q3

• A. C - H
• B. C - N
• C. C - O
• D. C - C

Explanation: Smaller the atom bonded lesser will be the bond length and higher will be the bond energy The highest bond energy among the given single…

• A. 66.3 pm
• B. 276.1 pm
• C. 77.3 pm
• D. 175.4 pm

Explanation: The covalent radius of an atom is half the distance between two identical atoms joined by a single covalent bond.

• A. released when a bond is formed between two gaseous atoms, or equally the energy needed to break it
• B. needed to melt an ionic solid
• C. stored in the nucleus
• D. needed to ionise an atom

Explanation: Breaking a bond is endothermic and forming the same bond is exothermic by exactly the same amount, so bond energy can be quoted either way…

• A. HF
• B. HCl
• C. HBr
• D. HI

Explanation: HF has greater bond energy than HCl. The bond energy of HF is 568 kJ/moL, while the bond energy of HCl is 431 kJ/moL.

• A. Pressure of mutiple bonds
• B. Nature of hybridization present
• C. Difference in electronegativity between the two bonded atoms
• D. Ionization energies of the two bonded atoms

Explanation: Explanation for this question will be added soon.

• A. C - F
• B. C - Cl
• C. C - I
• D. C - Br

Explanation: C-I bond is the longest bond of all the options as atomic radius increases down the group, iodine is furthest down hence minimum bond…

• A. When both attractive and repulsive forces are balanced
• B. When attractive forces overcome repulsive forces
• C. When repulsive forces are negligible
• D. When repulsive forces exceed attractive forces

Explanation: Explanation:Bond is formed when either the attraction and repulsion are equal or the force of attraction is greater than repulsion.