Topic: Thermodynamics, Test No.: 02, Total MCQs: 15
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Identify the correct statement from the following in a chemical reaction. [West Bengal JEE 2012]
The entropy always increases
The change in entropy along with suitable change in enthalpy decides the fate of a reaction
The enthalpy always decreases
Both the enthalpy and the entropy remain constant
For the reversible reaction,
A(s) + B(g) C(g) + D(g) ΔG° = -350kJ,
which one of the following statements is true? [Karnataka CET 2011]
The reaction is thermodynamically non-feasible.
The entropy change is negative.
Equilibrium constant is greater than one.
The reaction should be instantaneous.
The enthalpy of vaporization of benzene is +35.3 kJ/mol at its boiling point of 80°C. The entropy change in the transition of vapour to liquid at its boiling point is ______. (in J mol−1 K−1) [Karnataka CET 2011]
The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 to a volume of 100 dm3 at 27°C is [AIEEE 2011]
42.3 J mol–1 K–1
38.3 J mol–1 K–1
35.8 J mol–1 K–1
32.3 J mol–1 K–1
In view of the signs of ΔrG° for the following reactions
PbO2 + Pb → 2 PbO, ΔrG° < 0
SnO2 + Sn → 2 SnO, ΔrG° > 0,
Which oxidation states are more characteristic for lead and tin? [AIEEE 2011]
For lead +2, for tin +4
For lead +4, for tin +2
For lead +2, for tin +2
For lead +4, for tin +4
The Gibbs energy for the decomposition Al2O3 at 500°C is as follows:
Al2O3 → Al + O2, ΔrG = +966kJ mol–1
The potential difference needed for electrolytic reduction of Al2O3 at 500°C is at least [AIEEE 2010]
For a particular reversible reaction at temperature T, ΔH and ΔS were found to be both +ve. If Te is the temperature at equilibrium, the reaction would be spontaneous when [AIEEE 2010]
T = Te
Te > T
T > Te
Te is 5 times T
On the basis of the following thermochemical data:
(ΔfG°H+(aq) = 0)
H2O(l) → H+ (aq) + OH− (aq); ΔH = 57.32 kJ
H2 (g) + O2(g) → H2O(l) ΔH = −286.20kJ
The value of enthalpy of formation of OH− ion at 25°C is : [AIEEE 2009]
In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is
CH3OH(l) + O2(g) → CO2(g) + 2H2O(l)
At 298 K standard Gibb's energies of formation for CH3OH(l), H2O(l) and CO2(g) are –166.2, –237.2 and –394.4 kJ mol–1 respectively. If standard enthalpy of combustion of methanol is –726 kJ mol–1, efficiency of the fuel cell will be [AIEEE 2009]
One mole of which of the following has the highest entropy? [Karnataka CET 2008]
When compared to ΔG° for the formation of Al2O3, the ΔG° for the formation of Cr2O3 is [Karnataka CET 2008]
Standard entropy of X2, Y2 and XY3 are 60, 40 and 50JK−1mol−1, respectively.
For the reaction, X2 + Y2 → XY3, ΔH = -30kJ, to be at equilibrium, the temperature will be [AIEEE 2008]
Entropy of the universe is [Karnataka CET 2007]
In which of the following process, a maximum increase in entropy is observed? [Karnataka CET 2007]
dissolution of salt in water
condensation of water
sublimation of naphthalene
melting of ice
ΔHvap = 30 KJ/mole and ΔSvap = 75 Jmol–1K–1. Find temperature of vapour, at one atmosphere [IIT JEE 2004]