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Define entropy.
Concept: Spontaneous (Irreversible) Process
Write electrode reaction and net cell reaction for fuel cell. Calculate e.m.f. of the following cell at 25 °C.
Standard reduction potential (SRP) of Zn and Cu are − 0.76 V and 0.334 V respectively
Concept: Batteries >> fuel cell
Write mathematical expression of molar conductivity of the given solution at infinite dilution.
Concept: Conductance of Electrolytic Solutions >> Variation of Conductivity and Molar Conductivity with Concentration
Write cathode and anode reaction in a fuel cell.
Concept: Electrochemical Cells
In the hydrogen-oxygen fuel cell, the carbon rods are immersed in the hot aqueous solution of __
(a) KCl
(b) KOH
(c) H2SO4
(d) NH4Cl
Concept: Batteries >> fuel cell
How many faradays of electricity are required to produce 13 gram of aluminium from aluminium chloride solution? (Given: Molar mass of Al = 27.0-gram mol–1)
Concept: Electrolytic Cells and Electrolysis - Introduction
Calculate the internal energy at 298K for the formation of one mole of ammonia, if the enthalpy change at constant pressure is – 42.0 kJ mol-1.
(Given: R = 8.314 J K-1 mol-1)
Concept: Chemical Thermodynamics and Energetic >> First Law of Thermodynamics
How many faradays of electricity are required to produce 6 g of Mg from MgCl2?
Concept: Electrochemical Cells
How much quantity of electricity in coulomb is required to deposit 1.346 × 10-3 kg of Ag in 3.5 minutes from AgNO3 solution?
( Given: Molar mass of Ag is 108 × 10-3 kg mol-1 )
Concept: Electrolytic Cells and Electrolysis - Introduction
What is the ‘Ellingham diagram’? Write any ‘two points’ of its significance.
Concept: Relation Between Gibbs Energy Change and Emf of a Cell
The S.I. unit of cell constant for conductivity cell is __________.
Concept: Conductance of Electrolytic Solutions >> Variation of Conductivity and Molar Conductivity with Concentration
Select the most appropriate option.
A gas is allowed to expand in a well-insulated container against a constant external pressure of 2.5 bar from an initial volume of 2.5 L to a final volume of 4.5 L. The change in internal energy, ΔU of the gas will be _______.
Concept: Chemical Thermodynamics
Answer the following in one or two sentences.
Comment on the statement:
no work is involved in an expansion of gas in a vacuum.
Concept: Expression for Pressure-volume (PV) Work
Answer the following in one or two sentences.
State second law of thermodynamics in terms of entropy.
Concept: Spontaneous (Irreversible) Process
Answer in brief.
How much heat is evolved when 12 g of CO reacts with NO2? The reaction is:
4CO(g) 2NO2(g) → 4CO2(g) + N2(g), ΔrH° = - 1200 kJ
Concept: Thermochemistry
Answer the following question.
State Hess’s law of constant heat summation. Illustrate with an example. State its applications.
Concept: Thermochemistry
Answer the following in one or two sentences.
Write any two functions of salt bridge.
Concept: Galvanic or Voltaic Cell
An intensive property amongst the following is ______.
Concept: Terms Used in Thermodynamics
The change in internal energy in a reaction when 2kJ of heat is released by the system and 6 kJ of work is done on the system will be ______.
Concept: Internal Energy (U)
