1st Year Chemistry Chapter 6 Test06. Thermochemistry

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Born Haber cycle is used to determine lattice energies of _______:
   1. Molecular solids
   2. Ionic solids
   3. Covalent solids
   4. Metallic solids
2. The heat of neutralization between NaOH and HCl is approximately:
   1. +58.0 kJ/mol
   2. -58.0 kJ/mol
   3. +57.4 kJ/mol
   4. -57.4 kJ/mol
3. Calorie is equivalent to:
   1. 4.18J
   2. 4.18KJ
   3. 0.418J
   4. 0.418KJ
4. Heat of _______ a substance is always negative:
   1. Formation
   2. Combustion
   3. Decomposition
   4. Solution
5. The energy required to break one mole of bonds to form neutral atoms is called:
   1. Bond energy
   2. Activation energy
   3. Ionization energy
   4. Lattice energy
6. The standard enthalpy of combustion of carbon is:
   1. -285.8 kJ/mol
   2. -393.5 kJ/mol
   3. -571.6 kJ/mol
   4. -121 kJ/mol
7. The combustion of carbon to CO₂ evolves energy of:
   1. -110.52 kJ
   2. -282.98 kJ
   3. -393.5 kJ
   4. -571.6 kJ
8. The heat change when one mole of a compound forms from its elements is called:
   1. Enthalpy of combustion
   2. Enthalpy of atomization
   3. Enthalpy of neutralization
   4. Enthalpy of formation
9. Entropy is a measure of:
   1. Heat content
   2. Randomness or disorder of a system
   3. Potential energy
   4. Molecular mass
10. The unit of thermal energy in SI system is:
    1. Calorie
    2. Newton
    3. Erg
    4. Joule