11. The enthalpies of formation of Al-O, and B,O, are -1676 and 1274 kJ/mol resp

Question

11. The enthalpies of formation of Al-O, and B,O, are -1676 and 1274 kJ/mol respectively. Do these data indicate the rate of oxidation of Al and B? (A) Yes (B) No (C) Cannot say 12. Which one of the following reactions reacts the most rapidly at room temperature (A) (B) (C) 2H, + O2 2 H2O H, OH, H2O (neutralization) CoH220,1 (sugar) 12 C + 1 1 H20 (D) H + OH H2O (radical reaction) 13. Gases can be liquefied using a two-step process: a compression followed by an expansion. During the compression, energy is transferred from the gas as heat: however, during the expansion, the temperature of the gas is lowered. Which of the following compression/expansion combinations satisfies the requirements for gas liquefaction? (A) isothermal compression followed by an adiabatic expansion (B) isentropic compression followed by an adiabatic expansion (C) adiabatic compression followed by an isentropic expansion (D) isobaric compression followed by an isothermal expansion (E) adiabatic compression followed by a isobaric expansion 14. You store food in a fridge to prevent spoilage. Which factor are you applying to slow the rate of reaction? (A) nature of reactants (B) isolation of reactants (C) avoid catalysts (D) temperature 15. A system is transforned berwcen two states, Its entropy change AS da IT if (A) It is a closed system (B) The transformation is reversible (C) The temperature is constant (D) The process is spontaneous

Explanation / Answer

Ans 11 : C) cannot say

The enthalpy of formation of acompound is referred to the energy change of the compound , that has accompanied when one mole of the compound was formed from its constituent elements in standard states.

The positive and negative sign indicate the energy absorbed or released respectively.

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