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question_answer1) What is a Daniell cell?
question_answer2) What is galvanic or voltaic cell?
question_answer3) What is a half cell (electrode)?
question_answer4) Define electrode potential.
question_answer5) What is standard electrode potential?
question_answer6) What are cathode and anode? Give their symbol.
question_answer7) Define cell potential.
question_answer8) What is emf of a cell?
question_answer9) What do you mean by standard hydrogen electrode (S.H.E)?
question_answer10) What is the potential of S.H.E?
question_answer11) What is electrochemical series?
question_answer12) What is the relation between free energy change and emf of a cell?
question_answer13) Write name and polarity of an electrode where oxidation takes place in galvanic cell.
question_answer14) How does oxidation state of manganese change in the Leclanche cell?
question_answer15) What is electrical resistance? What is its unit?
question_answer16) What is resistivity (specific resistance)?
question_answer17) What is conductance? What is its unit?
question_answer18) What is conductivity (specific conductance)?
question_answer19) What are super conductors?
question_answer20) What is conductivity cell?
question_answer21) Define cell constant. What is its unit?
question_answer22) Define limiting molar conductivity.
question_answer23) What is degree of dissociation?
question_answer24) How is resistance related to cell constant and conductivity?
question_answer25) Write an equation relating with concentration (C) for strong electrolytes.
question_answer26) How is molar conductivity related to degree of dissociation of electrolyte?
question_answer27) State Kohlrausch law of independent migration of ions.
question_answer28) Limiting molar conductivity of an electrolyte can not be determined experimentally. Why?
question_answer29) Suggest a method for the determination of limiting molar conductivity of weak electrolytes.
question_answer30) What is Faraday?
question_answer31) What is over potential?
question_answer32) Which type of reaction occurs at anode and cathode during electrolysis?
question_answer33) What are the products of electrolysis of fused?
question_answer34) What are the products of electrolysis of aqueous solution?
question_answer35) What are the products of electrolysis of sulphuric acid in dilute solution?
question_answer36) What are the products of electrolysis of concentrated solution of sulphuric acid?
question_answer37) Write the cell reaction during electrolysis of aqueous solution.
question_answer38) Define electrochemical equivalent.
question_answer39) What is a battery?
question_answer40) What is a primary cell? Give example.
question_answer41) What is a secondary cell? Give example.
question_answer42) Which substance is used as electrode in a dry cell?
question_answer43) rite the electrode reactions that occur in dry cell.
question_answer44) What is Leclanche cell?
question_answer45) What is mercury cell?
question_answer46) Name the battery used for low current devices like watches and hearing aids.
question_answer47) Write electrode reactions occuring in mercury cell.
question_answer48) Name the substance used as electrolyte in a mercury cell.
question_answer49) The cell potential of mercury cell remains constant during its life time. Why?
question_answer50) Name the battery used in automobiles and inverters.
question_answer51) What is nickel - cadmium cell?
question_answer52) Name the electrodes and electrolytes used in nickel - cadmium cell.
question_answer53) Write electrode reactions of nickel - cadmium cell.
question_answer54) What are the demerits of a thermal power plant?
question_answer55) What are fuel cells? Give example.
question_answer56) Name the fuel cell used in Apollo space programme.
question_answer57) Write the electrode reactions taking place in a fuel cell.
question_answer58) What is corrosion?
question_answer59) Give example of a corrosion which is useful?
question_answer60) What is the source of H"*" ion during corrosion?
question_answer61) Give name and formula of compound formed during rusting of iron.
question_answer62) Name any two metals that can be used in cathodic protection of iron.
question_answer63) What is barrier protection of metal?
question_answer64) How is potential of an electrode determined?
question_answer65) Zinc can reduce hydrogen ion but copper cannot. Why?
question_answer66) What is the role of platinum or gold as electrode?
question_answer67) Explain why fluorine is the strongest oxidising agent?
question_answer68) Lithium metal is the strongest reducing agent. Why?
question_answer69) Mention the application of electrochemical cells.
question_answer70) Write Nernst equation and explain the terms involved.
question_answer71) Mention some of the applications of electrochemical series.
question_answer72) How is equilibrium constant of a reaction is related to standard emf of a cell?
question_answer73) How can strong and weak electrolytes be distinguished?
question_answer74) Differentiate between insulator, semiconductor and conductor.
question_answer75) What is the difference between electronic and. Electrolytic conductors?
question_answer76) What are the factors on which electronic conductance depends?
question_answer77) On what factors conductivity of electrolytic solution depends?
question_answer78) How is conductivity of a solution determined?
question_answer79) What are the difficulties in measuring resistance of an ionic solution?
question_answer80) What is molar conductance? Give its unit.
question_answer81) Conductivity of a solution decreases with increasing dilution of solution. Why?
question_answer82) How molar conductivity varies with dilution of solution?
question_answer83) What are strong electrolytes? Give example.
question_answer84) What are weak electrolytes? Give example.
question_answer85) How molar conductivity of a strong electrolyte varies with concentration of solution?
question_answer86) How molar conductivity of a weak electrolyte varies with concentration of solution?
question_answer87) What is electrolytic cell?
question_answer88) What is electrolysis?
question_answer89) How is electrolysis used in purification of copper metal?
question_answer90) State Faradays laws of electrolysis.
question_answer91) What is lead storage battery?
question_answer92) Describe the construction and reactions of lead storage batteries.
question_answer93) What are the advantages of fuel cell?
question_answer94) Describe the reactions of a fuel cell.
question_answer95) Corrosion is an electrochemical phenomenon. Explain.
question_answer96) List important methods that can be used for the prevention of corrosion.
question_answer97) Copper has positive electrode potential hence it cannot be oxidised by H+ ion then how it is oxidised by nitric acid. Or Cu does not dissolve in but dissolves in Why?
question_answer98) What is sacrificial protection for corrosion?
question_answer99) Hydrogen is a renewable and non - polluting source of energy. Explain.
question_answer100) What is the vision of hydrogen economy?
question_answer101) What is the effect of hydration of ion on the conductivity of electrolytic solution?
question_answer102) Electrolysis of aqueous solution liberates at anode not Why?
question_answer103) The blue colour of copper sulphate solution is slowly discharged when a rod of zinc is dipped in it. Explain.
question_answer104) Why cannot oxidation occur without reduction?
question_answer105) Articles of iron are generally coated with zinc. Explain.
question_answer106) Check the feasibility of the following redox reaction with the help of electrochemical series \[Ni(s)+2A{{g}^{+}}\,(aq)\xrightarrow{\,}\,N{{i}^{2+}}\,(aq)+2Ag(s)\]
question_answer107) What will happen when chlorine is passed through an aqueous solution of potassium bromide?
question_answer108) What is the source of electrical energy in a galvanic cell?
question_answer109) How can the electrode potential of an electrode be increased?
question_answer110) Knowing that: \[C{{u}^{2+}}\,(aq)+2{{e}^{-}}\,\xrightarrow{\,}\,Cu\,(s);\] \[E{}^\circ =+0\cdot 34\,V\] \[E{}^\circ =+0\cdot 80\,V\] reason out whether, 1M silver nitrate solution can be stored in copper vessel or 1M copper sulphate solution in silver vessel.
question_answer111) In an electrochemical cell \[(Cu-Ag),\] why are solutions containing \[C{{u}^{2+}}\] and \[A{{g}^{+}}\] ions kept in separate containers?
question_answer112) What is the difference between cell potential and standard cell potential?
question_answer113) Write half cell reactions and balanced chemical equations for the following galvanic cells? (a) \[Zn(s)+|Z{{n}^{2+}}(aq)||\,C{{r}^{3+}}\,(aq)\,|Cr(s)\] (b) \[Pb(s),\,PbS{{O}_{4}}(s)|HSO_{4}^{-}(aq),\] \[{{H}^{+}}(aq)||{{H}^{+}}(aq),\,HSO_{4}^{-}(aq)\,|Pb{{O}_{2}}(s),\]\[PbS{{O}_{4}}(s)\] (c) \[Mg(s)|M{{g}^{2+}}(aq)||S{{n}^{2+}}(aq)|Sn(s)\].
question_answer114) Write the cell reaction if the Nernst equation is given by the relation \[{{E}_{cell}}={{E}^{o}}_{cell}\,-\frac{RT}{2F}\ln \,\frac{[P{{b}^{2+}}]}{{{[{{H}^{+}}]}^{2}}}\]
question_answer115) The ionic conductance of alkali metal cations increases with increase in atomic mass from lithium to caesium. Explain.
question_answer116) Iron does not rust even if zinc coating on its surface is broken but the same is not true when coating is of tin.
question_answer117) Rusting of iron becomes quicker in saline medium. Explain.
question_answer118) The mobility of \[{{H}^{+}}\] ions in ice is greater as compared to liquid water. Explain.
question_answer119) Given that \[C{{o}^{3+}}+{{e}^{-}}\xrightarrow{\,}C{{o}^{2+}};\,\,{{E}^{o}}=+1.82\,\text{V}\] \[2{{H}_{2}}O\xrightarrow{\,}\,{{O}_{2}}+4{{H}^{+}}\,+4{{e}^{-}};\,\,{{E}^{o}}=-1.23\,\text{V}\] Explain why \[C{{o}^{3+}}\] is not stable in aqueous solution.
question_answer120) What would happen if the protective tin coating over an iron bucket is broken in some places?
question_answer121) Explain why zinc dissolves in dilute \[HCl\] to liberate \[{{H}_{2}}(g)\] but from concentrated \[{{H}_{2}}S{{O}_{4}},\] the gas evolved is\[S{{O}_{2}}\].
question_answer122) Three iron sheets have been coated separately with three metals (A, B and C) whose standard electrode potentials are given below. Metal A B C Iron -0.46V -0.66V -0.20V - 0.44 V Identify in which case rusting will take place faster when coating is damaged.
question_answer123) Why cannot aluminium metal be produced by the electrolysis of aqueous solution of aluminium salt?
question_answer124) Tarnished silver contains \[A{{g}_{2}}S\]. Can this tarnish be removed by placing tarnished silver ware in an aluminium pan containing an inert electrolyte solution such as NaCI? Given that the standard reduction potentials for the half reactions are: \[A{{g}_{2}}S(s)\,+2{{e}^{-}}\xrightarrow{\,}\,2Ag(s);\]\[+{{S}^{2-}}(aq);\,{{E}^{o}}=-0.71\,V\] \[A{{l}^{3+}}(aq)+3{{e}^{-}}\,\xrightarrow{\,}Al(s);\,\,{{E}^{o}}\,=-1.66\,\text{V}\].
question_answer125) The following chemical reaction is occurring in an electrochemical cell: \[Mg(s)+2A{{g}^{+}}\,(0.0001\,M)\xrightarrow{\,}\,M{{g}^{2+}}\,(0.10M)+2Ag(s)\] Given \[E_{M{{g}^{2+}}/Mg}^{o}=-2.36\,\,V;\,\]\[E_{A{{g}^{+}}/Ag}^{o}=+0.81\,\text{V}\] For the cell, calculate/write: E° value for the electrode \[2A{{g}^{+}}/2Ag\] Standard cell potential (E°) Cell potential (E) Give the symbolic representation of the above cell Will the above cell reaction be spontaneous?
question_answer126) An electrochemical cell stops working after sometime. Explain.
question_answer127)
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