Integer Answer Type Questions for JEE: Chemical Bonding & Molecular Structure | Chapter-wise Tests for JEE Main & Advanced PDF Download

Q.1. If MX₃ is T shaped, then the number of lone pair around M is

Ans. 2
For T-shape 2 lps appear at same side of axial line at plane of paper.

Q.2. The lattice energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water in the form of ions is endothermic to the extent of 1 kcal/mol. If the solution energies of Na⁺ and Cl^- are in the ratio 6:5, what is the enthalpy of hydration of Na⁺ ion?

Ans. -97.5
Na⁺(g) + Cl^-(g) → NaCl(s) ; ΔH = 180 kcal
NaCl(s) + aq → Na⁺(aq) + Cl^-(aq) ; ΔH = 1 kcal
Na⁺(g) + Cl^-(g) + aq. → Na⁺(aq.) + Cl^- (aq.) ; ΔH = A kcal
ΔH_solution = ΔH_lattice + ΔH_hydration
∴ 1 = 180 + ΔH_hydration
∴ ΔH_hydration = - 179 kcal = A

Q.3. The lattice energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water in the form of ions is endothermic to the extent of 1 kcal/mol. If the solution energies of Na⁺ and Cl^- are in the ratio 6:5, what is the enthalpy of hydration of Cl^- ion?

Ans. -81.4
Na⁺(g) + Cl^-(g) → NaCl(s) ; ΔH = 180 kcal
NaCl(s) + aq → Na⁺(aq) + Cl^-(aq) ; ΔH = 1 kcal
Na⁺(g) + Cl^-(g) + aq. → Na⁺(aq.) + Cl^- (aq.) ; ΔH = A kcal
ΔH_solution = ΔH_lattice + ΔH_hydration
∴ 1 = 180 + ΔH_hydration
∴ ΔH_hydration = - 179 kcal = A

Q.4. A molecule MX₄ has a square planar shape. The number of non-bonding pair of electrons is

Ans. 2

Q.5. The dipole moment (in Debye units) of m-dichlorobenzene is 1.72. What is the value of dipole moment for o- dichlorobenzene? 

Ans. 2.98
μR =
μ = μ_R = 1.72

Q.6. A diatomic molecule has a dipole moment of 1.92 D and a bond length of 2.0Å. What is the percentage ionic character in the molecule if e = 4.8 × 10^–10 esu?  

Ans. 20
% ionic characters

Q.7. If the electronegativity difference between two atoms A and B is 2.0, then the percentage ionic character in the molecule is 

Ans. 46
% ionic character = 16(ΔE.N) + 3.5(ΔE.N)²
= 16 (2) + 3.5 (2)²
= 46

Q.8. The bond of CN+

Ans. 2
Total e^- are 6 + 7 - 1 =  12e^-   
Bond order of CN⁺ = 4-0/2 = 2

Q.9. The number of unpaired electrons in N⁺₂

Ans.  1
N⁺₂ total number of e^- are 13e^- 
Only one electron is unpaired.

Q.10. Maximum number of Hydrogen bond formed by one molecule of H₂O is. 

Ans. 4
In Ice maximum number of hydrogen bonding by H₂O molecule are four.