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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 ________

a) negative

b) does not exist

c) 0

d) infinity

Answer: negative

7. The enthalpy of dilution of a solution is __________ on the original concentration of the solution and the amount of solvent added.

a) dependent

b) independent

c) may be dependent

d) may be independent

Answer: dependent

8. Enthalpy of combustion as always ________

a) positive

b) negative

c) 0

d) infinity

Answer: negative

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.

a) True

b) False

Answer: True

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Categories: Thermodynamics