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Enthalpies for Different Types of Reactions MCQs
1. In which of the following reactions the energy released is not an enthalpy of atomization?
a) decomposition of a hydrogen molecule into two hydrogen atoms
b) decomposition of an oxygen molecule into 2 oxygen atoms
c) formation of a water molecule
d) decomposition of chlorine molecule
Answer: formation of a water molecule
2. In case of the decomposition of hydrogen molecule into two hydrogen atoms, the enthalpy of atomization is same as the _________
a) bond dissociation enthalpy
b) enthalpy of formation
c) enthalpy of combustion
d) enthalpy of sublimation
Answer: bond dissociation enthalpy
3. Calculate the carbon carbon double bond energy in ethane from the following reaction, H2C=CH2(g) + H2(g) –> H3C−CH3(g) ΔH = −138 kJ/mol. If Bond enthalpies are: C−C = 348; H−H = 436; C−H = 412 in KJ/mol.
a) 498 KJ/mol
b) 593 KJ/mol
c) 508 KJ/mol
d) 598 KJ/mol
Answer: 598 KJ/mol
4. Decomposition of sodium chloride into a sodium ion and chloride ion releases energy of 788 KJ per Mol, what is the energy called?
a) lattice energy
b) translation energy
c) dilution energy
d) neutralization energy
Answer: lattice energy
5. Which of the following cycle allows has to analyze reaction energies?
a) carbon cycle
b) born Haber cycle
c) nitrogen cycle
d) chemical cycle
Answer: born Haber cycle
6. Enthalpy of solution can either be positive or ________
b) does not exist
7. The enthalpy of dilution of a solution is __________ on the original concentration of the solution and the amount of solvent added.
c) may be dependent
d) may be independent
8. Enthalpy of combustion as always ________
9. Calculate the heat of combustion of ethane, in the reaction C2H6(g) + 3 1/2O2(g) → 2CO2(g) + 3H2O(l) where the heats of formation of ethane gas, carbon dioxide gas and water liquid are –84.7 kJ mol-1, -393.5 kJ mol-1 and –285.8 kJ mol-1 respectively.
a) -1559.7 kJ mol-1
b) -155.7 kJ mol-1
c) -159.7 kJ mol-1
d) -559.7 kJ mol-1
Answer: -1559.7 kJ mol-1
10. The enthalpy of 435 KJ per Mol is obtained from the conversion of hydrogen molecule into two hydrogen atoms.