Problem 127
If \(\Delta \mathrm{H}^{\circ}\) formation for \(\mathrm{O}_{3}, \mathrm{CO}_{2}, \mathrm{NH}_{3}\) and HI can be given as 142.1, -393.2, -46.2 and \(+25.8 \mathrm{KJ} /\) mole. The order of their stability in increasing order can be given as: (a) \(\mathrm{NH}_{3}<\mathrm{CO}_{2}<\mathrm{HI}<\mathrm{O}_{3}\) (b) \(\mathrm{CO}_{2}^{3}<\mathrm{NH}_{3}<\mathrm{HI}<\mathrm{O}_{3}^{3}\) (c) \(\mathrm{O}_{3}<\mathrm{HI}<\mathrm{NH}_{3}<\mathrm{CO}_{2}^{3}\) (d) \(\mathrm{O}_{3}^{3}<\mathrm{HI}<\mathrm{NH}_{3}<\mathrm{CO}_{2}^{2}\)
Problem 128
Which of the following are endothemic reactions? (1) Decomposition of \(\mathrm{H}_{2} \mathrm{O}_{2}\) (2) Conversion of graphite into diamond (3) Combustion of ethane (4) Dehydration of ethanol into ethane (a) 1,2 (b) 2,4 (c) \(1,2,4\) (d) 1,4
Problem 129
\(36 \mathrm{ml}\) of pure water takes \(100 \mathrm{sec}\) to evaporate from a vessel and heater connected to an electric source which delivers 806 watt. The \(\Delta \mathrm{H}_{\mathrm{Vap}}\). of water is: (a) \(40.3 \mathrm{KJ} / \mathrm{mole}\) (b) \(406 \mathrm{KJ} / \mathrm{mole}\) (c) \(80.6 \mathrm{KJ} / \mathrm{mole}\) (d) \(20.15 \mathrm{KJ} / \mathrm{mole}\)
