Please select a subject first
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Complete the following statement by selecting the correct alternative from the choices given:
For a spontaneous reaction ΔG° and E° cell will be respectively:
Concept: Nernst Equation - Introduction
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
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)
How many moles of electrons are required for reduction of 2 moles of Zn2+ to Zn?
Concept: Electrochemical Cells
Calculate enthalpy of formation of HCl if bond enthalpies of H2, Cl2 and HCl are 434 kJ mol-1, 242 kJ mol–1 and 431 kJ mol–1 respectively.
Concept: Thermochemistry
Define the Enthalpy of sublimation.
Concept: Enthalpies of Physical Transformations
Write the features of reversible processes.
Concept: Terms Used in Thermodynamics
Derive an expression for pressure-volume work.
Concept: Expression for Pressure-volume (PV) Work
Define the Enthalpy of vaporization.
Concept: Enthalpies of Physical Transformations
Why work done in vacuum is zero?
Concept: Enthalpies of Physical Transformations
Calculate the standard enthalpy of formation of liquid methanol from the following data:
- \[\ce{CH3OH_{(l)} + \frac{3}{2} O_{2(g)} -> CO_{2(g)} + 2H2O_{(l)}}\] ∆H° = – 726 kJ mol–1
- \[\ce{C_{(Graphite)} + O_{2(g)} -> CO_{2(g)}}\] ∆cH° = – 393 kJ mol–1
- \[\ce{H_{2(g)} + \frac{1}{2} O_{2(g)} -> H2O_{(l)}}\] ∆fH° = – 286 kJ mol–1
Concept: Thermochemistry
The enthalpy change for the chemical reaction \[\ce{H2O_{(s)} -> H2O_{(l)}}\] is called enthalpy of ______.
Concept: Enthalpies of Physical Transformations
