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_____________________?

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Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?

A. log (1/H+) B. – log (1/H+) C. 1/log H+ D. None of these...

According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?

A. No component is concentrated at the surface of the solution B. The component molecules are non polar and are of almost equal size C. In the formation of solution, chemical combination/molecular association between unlike molecules takes place D. The attractive forces between like and unlike molecules are almost equal...

If pH value of a solution is 8, then its pOH value will be ____________________?

A. 6 B. 1 C. 7 D. 10...

The value of (Cp – Cv) for a real gas obeying Vander Wall’s equation is____________________?

A. R B. > R C. < R D. 0.5 R...

The temperature of a gas in a closed container is 27° C. If the temperature of the gas is increased to 300° C, then the pressure exerted is___________________?

A. Doubled B. Halved C. Trebled D. Unpredictable...