21. The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the
22. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
23. The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour
24. An ideal gas can be liquified, because
25. The value of the gas-law constant 'R' is 1.987
26. Volume occupied by one gm mole of a gas at S.T.P. is
27. The number of H+ in 1 c.c solution of pH 13 is
28. The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to
29. One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 → CO2 + 2H2O. Both the reactants and products are in gas phase. ΔH°298 = -730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about
30. The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies
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