Q.7. Consider the following cell reaction. Cư* (aq) + 21(aq) – Cu(s) + k<(s) Given, Cư (aq)/Cu(s) = 0.34 V kg) Ar(ax) = 0.54 V a) Write down half-cell reactions for the above reaction. b) Detemine whether the above reaction is sportaneous or not.
Electronic Effects
The effect of electrons that are located in the chemical bonds within the atoms of the molecule is termed an electronic effect. The electronic effect is also explained as the effect through which the reactivity of the compound in one portion is controlled by the electron repulsion or attraction producing in another portion of the molecule.
Drawing Resonance Forms
In organic chemistry, resonance may be a mental exercise that illustrates the delocalization of electrons inside molecules within the valence bond theory of octet bonding. It entails creating several Lewis structures that, when combined, reflect the molecule's entire electronic structure. One Lewis diagram cannot explain the bonding (lone pair, double bond, octet) elaborately. A hybrid describes a combination of possible resonance structures that represents the entire delocalization of electrons within the molecule.
Using Molecular Structure To Predict Equilibrium
Equilibrium does not always imply an equal presence of reactants and products. This signifies that the reaction reaches a point when reactant and product quantities remain constant as the rate of forward and backward reaction is the same. Molecular structures of various compounds can help in predicting equilibrium.
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Electrochemistry
Roll No. 4,9, 14, 19, 24, 29, 34
Q.1. Compare between galvanic and electrolytic cells.
Q.2. Explain electrolysis of molten and aqueous NaCl.
Q.3. Detemine plIforthe following cell:
ZnZr* (1M) || H+ (test solution)/Hz (1 atm)/Pt
Given, Eceil =0.50 V and E'ceil =0.76 V
Q.4. Calculate Eell using AGf values for the following reaction? Comment whether the reaction
is spontaneous ornot?
Zn (s) + Cl2 (g) – Zr**(aq) + 2CI (aq)
where AGf values are for: Zn(s)- 0, Ch (g)= 0, Zr*(aq) = -147 kj & Cl (aq)= - 131 kj
Q.5. Draw the voltaic cell with following notation and comment whether the cell reaction is
sportaneous or not? If not, what should you do?
Cu (s)/ Cư" (aq) |lH+ (test solution)/Hz (1 atm)/Pt
where E'Cuces = -0.34 V & E° IH/I2=0.0 V
Q.6. Balance the following net reaction for oxidation of Zn by HNO: (acidic solution) using half
-reaction method:
Zn (s) + NOs (aq) – Zn* (aq) + NH (aq)
Q.7. Consider the following cell reaction.
Cư* (aq) + 21(aq) + Cu(s) + k(s)
Given, Cư* (ac)/Cu(s) = 0.34 V
l(g) /I'(aq) = 0.54 V
a) Write down half-cell reactions for the above reaction.
b) Determine whether the above reaction is spontaneous or not.
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