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How much charge is required for the reduction of 1 mol of Zn2+ to Zn?
Concept: Nernst Equation - Introduction
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 - Introduction
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
What are interstitial compounds?
Concept: General 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: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Complete the following equations : 2 Na2CrO4 + 2 H + →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
|
`E_((M^(2+)/M)` |
Cr | Mn | Fe | Co | Ni | Cu |
| -0.91 | -1.18 | -0.44 | -0.28 | -0.25 | -0.34 |
From the given data of E0 values, answer the following questions :
(1) Why is `E_(((Cu^(2+))/(Cu)))` value exceptionally positive
(2) Why is `E_(((Mn^(2+))/(Mn)))` value is highly negative as compared to other elements
(3) Which is the stronger reducing agents Cr2+ or Fe2+ ? Give Reason.
Concept: General Properties of the Transition Elements (d-block)
Why do actinoids show a wide range of oxidation states?
Concept: F-block Elements >> The Actinoids
Write on similarity between the chemistry of lanthanoids and actinoids.
Concept: F-block Elements >> The Actinoids
Explain effects of lanthanoid contraction.
Concept: F-block Elements >> The Lanthanoids
When a coordination compound CoCl3.6NH3 is mixed with AgNO3, 3 moles of AgCl are precipitated per mole of the compound. Write the structural formula of the coordination compound.
Concept: Isomerism in Coordination Compounds >> Stereoisomerism
Draw the geometrical isomers of complex \[\ce{[Co(en)2Cl2]+}\].
Concept: Isomerism in Coordination Compounds >> Stereoisomerism
Write the dispersed phase and dispersion medium of butter.
Concept: Catalysis >> Enzyme Catalysis
