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The vapour pressure of pure liquid X and pure liquid Y at 25°C are 120 mm Hg and 160 mm Hg respectively. If equal moles of X and Y are mixed to form an ideal solution, calculate the vapour pressure of the solution.
Concept: Vapour Pressure of Liquid Solutions >> Vapour Pressure of Liquid- Liquid Solutions
What happens if external potential applied becomes greater than E°cell of electrochemical cell?
Concept: Electrochemical Cells
The conductivity of 0.20 mol L−1 solution of KCl is 2.48 × 10−2 S cm−1. Calculate its molar conductivity and degree of dissociation (α). Given λ0 (K+) = 73.5 S cm2 mol−1 and λ0 (C1−) = 76.5 S cm2 mol−1.
Concept: Conductance of Electrolytic Solutions >> Variation of Conductivity and Molar Conductivity with Concentration
What type of battery is mercury cell? Why is it more advantageous than dry cell?
Concept: Batteries >> Primary Batteries
Why does the conductivity of a solution decrease with dilution?
Concept: Conductance of Electrolytic Solutions >> Variation of Conductivity and Molar Conductivity with Concentration
Name the type of cell which was used in Apollo space programme for providing electrical power.
Concept: Batteries >> Primary Batteries
State second law of electrolysis
Concept: Electrolytic Cells and Electrolysis
What advantage do the fuel cells have over primary and secondary batteries?
Concept: Fuel Cells
Which of the following solutions of KCl will have the highest value of molar conductivity?
Concept: Conductance of Electrolytic Solutions >> Variation of Conductivity and Molar Conductivity with Concentration
Give reasons:
Mercury cell delivers a constant potential during its life time.
Concept: Batteries >> Primary Batteries
The rate constant of a first order reaction increases from 2 × 10−2 to 4 × 10−2 when the temperature changes from 300 K to 310 K. Calculate the energy of activation (Ea).
(log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)
Concept: Temperature Dependence of the Rate of a Reaction
The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction assuming that it does not change with temperature.
Concept: Temperature Dependence of the Rate of a Reaction
For a reaction R ---> P, half-life (t1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction?
Concept: Factors Influencing Rate of a Reaction
Define the following term:
Pseudo first-order reaction
Concept: Factors Influencing Rate of a Reaction
For a reaction
\[\ce{2H2O2->[I^-][Alkaline medium]2H2O + O2}\]
The Proposed mechanism is given below:
(1) H2O2+I- → H2O+IO-(slow)
(2) H2O2+IO-→H2O+I-+O2(fast)
(i) Write the rate law for the reaction.
(ii) Write the overall order of a reaction.
(iii) Out of steps(1) and (2), which one is the rate-determining step?
Concept: Effect of Catalyst on the Rate of Reaction
The decomposition of NH3 on a platinum surface is a zero-order reaction. If the rate constant (k) is 4 x 10-3 ms-1, how long will it take to reduce the initial concentration of NH3 from 0.1 M to 0.064 M?
Concept: Zero Order Reactions
What are interstitial compounds?
Concept: Physical Properties of the Transition Elements (d-block)
Define lanthanoid contraction.
Concept: F-block Elements >> The Lanthanoids
Account for the following :
Zr and Hf have almost similar atomic radii.
Concept: F-block Elements >> The Lanthanoids
Complete the following equations : 2 MnO2 + 4 KOH + O2 →
Concept: Important Compounds of Transition Elements
