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Chapter 10: Problem 7
Standard heat of formation of an element is (a) infinite (b) zero (c) \(100 \mathrm{~kJ}\) (d) \(200 \mathrm{~kJ}\)
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A reaction whose heat of reaction shows the bond energy of \(\mathrm{HCl}\) is (a) \(\mathrm{HCl}(\mathrm{g}) \longrightarrow \mathrm{H}(\mathrm{g})+\mathrm{Cl}(\mathrm{g})\) (b) \(2 \mathrm{HCl}(\mathrm{g}) \longrightarrow \mathrm{Hl}(\mathrm{g})+\mathrm{Cll}(\mathrm{g})\) (c) \(\mathrm{HCl}(\mathrm{g}) \longrightarrow \frac{1}{2} \mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{Cl}_{2}(\mathrm{~g})\) (d) \(\mathrm{HCl}(\mathrm{g}) \longrightarrow \mathrm{H}^{+}(\mathrm{g}) \longrightarrow \mathrm{Cl}^{-}(\mathrm{g})\)
The enthalpies of elements in their standard states are taken as zero. Thus, the enthalpy of formation of a compound (a) will always be positive (b) will always be negative (c) may be positive or negative (d) will always be zero
Thermochemistry is the study of (a) heat changes accompanying chemical reactions (b) net entropy change in a reaction (c) net free energy change in a chemical reaction (d) none of these
The apparatus used for measuring heat of reaction at constant volume is called (a) calorimeter (b) colourimeter (c) pyrometer (d) pyknometer
The heat of neutralisation is maximum for the reaction (a) \(\mathrm{NaOH}\) and \(\mathrm{HCl}\) (b) \(\mathrm{NaOH}\) and \(\mathrm{CH}_{3} \mathrm{COOH}\) (c) \(\mathrm{HCl}\) and \(\mathrm{NH}_{4} \mathrm{OH}\) (d) \(\mathrm{NH}_{4} \mathrm{OH}\) and \(\mathrm{CH}_{3} \mathrm{COOH}\)
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