page 07 13. For which of the following reactions would the value of ∆G° - ∆H° be closest to zero? A CaCO3(s) ↓ CaO(s) + CO2(g) B C(s) + H2O(g) ↓ CO(g) + H2(g) C Zn(s) + 2H+(aq) ↓ Zn2+(aq) + H2(g) D Cu2+(aq) + Mg(s) ↓ Mg2+(aq) + Cu(s) 14. The following reaction is first order with respect to P and second order with respect to Q. P + Q ↓ R + S Which of the following statements is not correct? A The reaction is third order overall. B The reaction occurs by a simple one step mechanism. C The rate of the reaction decreases as the reaction proceeds. D The rate of the reaction will double if the initial concentration of P is doubled. 15. H C C H C C H H H H Which of the following types of hybridisation occur in the above compound? A sp3 only B sp3 and sp C sp3 and sp2 D sp3, sp2 and sp [Turn over