Thermodynamics - Online Test
Q1. Calorimetry is a branch of science dealing with
Answer : Option B
Explaination / Solution:
Calorimetry is a branch of science dealing with measuring the amount of energy transferred as heat
Q2. An exothermic process
Answer : Option A
Explaination / Solution:
Exothermic process results in decrease in enthalpy of system hence for exothermic reaction ΔH= -ve.
Q3. The enthalpy change of a chemical reaction equals ( and are stoichiometric coefficients)
Answer : Option A
Explaination / Solution:
Q4. Standard enthalpy of fusion or molar enthalpy of fusion is
Answer : Option B
Explaination / Solution:
The enthalpy change that accompanies melting of one mole of a solid substance in standard state is enthalpy of fusion.
Q5. Standard Molar Enthalpy of Formation is
Answer : Option B
Explaination / Solution:
The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation is enthalpy of formation.
Q6. According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy is
Answer : Option C
Explaination / Solution:
Hess’s Law states that the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature.
Q7. Enthalpy of atomization is enthalpy change on breaking
Answer : Option D
Explaination / Solution:
Enthalpy of atomization is enthalpy change that take place on breaking one mole of bonds completely to obtain atoms in the gas phase.
Q8. In the case of compounds such as etc which of the following term is used as bond enthalpy.
Answer : Option D
Explaination / Solution:
For polyatomic molecules the term mean bond enthalpy is used for the enthalpy changes associated with chemical bonds.
Q9. Enthalpy of solution of a substance is the enthalpy change
Answer : Option D
Explaination / Solution:
Enthalpy of solution of a substance is the enthalpy change when one mole of it dissolves in a specified amount of solvent
Q10. The lattice enthalpy of an ionic compound is the
Answer : Option A
Explaination / Solution:
The lattice enthalpy of an ionic compound is the enthalpy change which occurs when one mole of an ionic compound dissociates into its ions in gaseous state.
