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Class 11 Chemistry Practice Test: Thermodynamics - Enthalpy Change, ∆rH of a Reaction - Reaction Enthalpy
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Avg score: 87% • Most missed: “What is the unit of standard enthalpy of fusion or molar enthalpy of fusion?”

Enthalpy change is the name given to the amount of heat evolved or absorbed in a reaction carried out at constant pressure. It is given the symbol ΔH, read as "delta H". Note: The term "enthalpy change" only applies to reactions done at constant pressure.

The reaction enthalpy is calculated by subtracting the sum of enthalpies of all the reactants from that of the products.

Class 11 Chemistry Practice Test: Thermodynamics - Enthalpy Change, ∆rH of a Reaction - Reaction Enthalpy
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10 Questions

1. Consider that, a ball is immersed in water at room temperature and then taken out having 18 grams of water on it, how much amount of energy is required to dry that water at room temperature?
2. Consider the equation 2 H2 + O2 → 2 H2O, what does the 2 in the coefficient of H2O molecule represent?
3. What is the unit of standard enthalpy of fusion or molar enthalpy of fusion?
4. When a chemical reaction is reversed the value of enthalpy is reversed in sign.
5. ΔHr = Σ ΔHf[products] – Σ ΔHf[reactants].
6. Which of the following is not an application of Hess’s law?
7. What is a change in energy if 18 grams of water is heated from room temperature to 20 degrees above it?
8. Calculate the internal energy change when 2 moles of water at 0 degrees converts into ice at 0-degree centigrade?
9. The standard state of a substance is considered when the temperature is 298 k and the pressure is ____________
10. All the enthalpies of fusion are positive.

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