ANSWERS OF NUMERICAL PROBLEMS MUST END WITH PROPER. UNITS. • QUESTIONS . Differences between electrochemical reaction and electrolysis. Electrochemistry Problems. 1). Given the E° for the following half-reactions: Cu. +. + e. -. → Cu°. E°red = V. Cu. 2+. + 2e. -. → Cu°. E°red = V. What is E°. Ten things to know before working electrochemistry problems: 1. Oxidation- Reduction Reactions. Every electrochemical reaction must involve a chemical system.

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A Zn cannot replace hydrogen from acids B Zn is reducing agent. If the atomic masses of X and Y are in the ratio electeochemistry 2: The equivalent conductivity of the salt at infinite dilution is. The molar conductivity of the solution is. The current passed, in amperes, is. In case of metallic conduction. A The resistance increases with increasing temperature. B The resistance decreases with increasing temperature. D The resistance electrrochemistry independent of the length of electrolytic conductor.

A With increase in temperature vibration of Kernal Cation increases and therefore, conduction decreases and hence, resistance of the metallic conductor increases. The ratio in mol in which the metals Ag, Ni and Cr will be deposited is. A A redox reaction B O 2 is reducing agent. Thus coulomb charge means charge on N electrons where N in Av. What mass of Ni is deposited at the cathode?

What will be the molarity of solution at the end of electrolysis? The electrolysis of Ni NO 3 2 in presence of Ni electrode will bring in following changes:. Thus, there will be no change in conc. Density of Ag is Also calculate the equilibrium constant of the reaction.

Calculate solubility product of AgI. The half cell reaction is: The cell voltage will be. MnO 4 -and weakest reductant: Stronger is oxidant, weaker is its conjugate reductant and vice-versa.

## Practice Questions(Solved) – Electrochemistry, Class 12, Chemistry

The emf of the cell is. A unpredictable B – Find the molarity of Zn 2 after the deposition of Zn. Assume the volume of the solution remains constant during electrolysis. If the potential drops across the cell is 3.

The negative electrode is in contact with a solution of 10 -6 M H ion. Calculate [H ] at positive electrode.

The oxidation state of the metal in the metal salt is: Thus, L O 2 requires Rs x for its production. Negative value shows electrochemistru the reaction will proceed from right to left, i. Since, the value of cell potential is positive, the reaction will proceed spontaneously in forward direction. Find out the conc. A Increase by 0. Note electrolysis of NaCl aq.

The standard electrode potential of cell is. B atomic weight 27 and C atomic weight 48 were electrolysed under identical numreicals using the same quantity of electricity. It was found that when electrochejistry. The valencies of A, B and C respectively. Some half cell reactions and their standard potentials are given below: Identify the only incorrect statement regarding the quantitative estimation of aqueous Fe NO 3 2.

A MnO 4 – will oxidise Cl – ion according to equation. Electrolysis involves electronation and de-electronation at the respective electrodes. Anode of electrolytic cell is the numfricals at which de-electronation takes place whereas at cathode electronation is noticed.

If two or more ions of same charge are to be electronated or de-electronated, the ion having lesser discharge potential is discharged.

The products formed at either electrode is given in terms of Faraday’s electrofhemistry of electrolysis i. A current of The concentration of CuSO 4 left in solution is.

D It is the case of attacked electrodes that is.

The resistance of 0. Calculated the molar conductivity of the copper sulphate solution. If ionic conductances of Na and Cl – ions at the same temperature are Calculate the degree of dissociation of NaCl solution.

The solubility of AgCl is …. If equal volumes of solution A and B are mixed, what will elecyrochemistry the resistance of the mixture, using the same cell? Assume that there is no increase in the degree rlectrochemistry dissociation of A and B mixing Sol.

When equal volume of A and B are mixed, the volume becomes double. Find the capacity of the vessel if it was fully filled with water. Double salt on ionization gives more ions. One molecule of the salt gives Fe 22Al 34SO 4 -2 ions. Hence its conductance would be highest. Match experimental value with the theoretical value. On what factors does the value of slope depend? Continue with Google Continue with Facebook.

Already Have an Account? The equivalent conductivity of the salt at infinite dilution is- A ohm -1 cm 2 eq -1 B ohm -1 cm 2 eq -1 C 60 ohm -1 cm 2 eq -1 D ohm -1 cm 2 eq -1 Sol. The elecfrochemistry conductivity of the solution electrochenistry – A 1. The current passed, in amperes, is- A 1.

### Electrochemistry questions (practice) | Khan Academy

In case of metallic conduction – A The resistance increases with increasing temperature B The resistance decreases with increasing temperature C The flow of currnet does not generate heat D The resistance is independent of the length of electrolytic conductor Sol. The ratio in mol in which the metals Ag, Ni and Cr will be deposited is- A 1: Q coulomb deposits The electrolysis of Ni NO 3 2 in presence of Ni electrode will bring in following changes: The cell voltage will be A 2.

The emf of the cell is A 0.

As given, Cell I: A sec B sec C sec D sec Sol. Thus molar ratio is: D It is the case of attacked electrodes that is Anode: Calculate the degree of dissociation of NaCl solution Sol. C Double salt on ionization gives more ions.

Discussion Questions i For the reaction given below, apply Le-Chatelier principle electrkchemistry justify the results recorded by you and also bring out mathematical rationalisation of your results. Zn s Cu 2 aq Zn 2 aq Cu sii Determine the slope of the graph. Download EduRev app here for Class 12 preparation. Share with a friend. Practice Questions Solved – Electrochemistry, Class 12, Chemistry notes for Class 12 is made by best teachers who have written some of the best books of Class It has gotten views and also has 4.

You can see some Practice Questions Solved – Electrochemistry, Class 12, Chemistry sample questions with examples at the bottom of this page. EduRev is like a wikipedia just for education and the Practice Elfctrochemistry Solved – Electrochemistry, Class 12, Chemistry images and diagram are even better than Byjus! Do check out the sample questions of Practice Questions Solved – Electrochemistry, Class 12, Chemistry for Class 12, the answers and examples explain the meaning of chapter in the numfricals manner.

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