Chemistry questions
29404 published questions with worked solutions.
- Al_2O_3 is reduced by electrolysis at low potentials and high current. If 4.0 10^4 amperes of current is passed through molten...
- The equivalent conductance of M 32 solution of a weak monobasic acid is 8.0 mho cm^2 and at infinite dilution is 400 mho cm^2....
- The rusting of iron takes place as follows: 2 H^ + 2e^- + 1 2 O_2 H_2O(l) ; E^ = +1.23 V Fe^ 2+ (aq) + 2e^- Fe(s) ; E^ = -0.44 V...
- A variable, opposite external potential (E_ ext ) is applied to the cell Zn|Zn^ 2+ (1M)||Cu^ 2+ (1M)|Cu , of potential 1.1 V....
- The resistance of N 10 solution is found to be 2.5 10^3 . The equivalent conductance of the solution is (cell constant = 1.25 cm^...
- The molar conductivities ^ _ NaOAc and ^ _ HCl at infinite dilution in water at 25^ are 91.0 and 426.2 cm^2/mol, respectively. To...
- ^ _ ClCH_2COONa = 224 ^ -1 , cm^2 ,g ,equiv^ -1 ^ _ NaCl = 38.5 ^ -1 , cm^2 ,g ,equiv^ -1 ^ _ HCl = 203 ^ -1 , cm^2 ,g ,equiv^ -1...
- 9.65 C of electric current is passed through fused anhydrous MgCl_2 . The magnesium metal thus obtained is completely converted...
- When electric current is passed through acidified water for 1930 s, 1120 mL of H_2 gas is collected (at STP) at the cathode. What...
- An inaccurate ammeter and silver coulometer is connected in series in an electric circuit through which a constant direct current...
- What is the current efficiency of an electro-deposition of Cu metal from CuSO_4 solution in which 9.80 g copper is deposited by...
- X g of silver is plated out on a serving tray by electrolysis of a solution containing silver in +1 oxidation state for a period...
- An aqueous solution of NaCl on electrolysis gives H_2(g) , Cl_2(g) and NaOH according to reaction, 2 Cl^-(aq) + 2 H_2O 2 OH^-(aq)...
- When a certain conductivity cell was filled with 0.01 M solution of KCl, it had a resistance of 160 at 25^ , and when filled with...
- The ionic conductance of H^+ and SO_4^ 2- are 350 and 80 S ,cm^2 ,equiv^ -1 , hence equivalent conductance ( S ,cm^2 ,equivalent^...
- Equivalent conductance of BaCl_2 , H_2SO_4 and HCl are x_1, x_2 and x_3 S ,cm^2 ,equiv^ -1 at infinite dilution. If specific...
- For pure water, degree of dissociation of water is 1.9 10^ -9 ^ _m( H^+ ) = 350 S ,cm^2 ,mol^ -1 ^ _m( OH^- ) = 200 S ,cm^2 ,mol^...
- The efficiency of a fuel cell is 80% and the standard heat of reaction is -300 kJ. The reaction involves two electrons in redox...
- Consider the following table, Material | conductivity/S m^ -1 | Material | Conductivity/S m^ -1 I | | III | sodium | 2.1 10^ 3 |...
- The logarithm of the equilibrium constant of the cell reaction corresponding to the cell, X(s)|X^ 2+ (aq) , | ,Y^+(aq)|Y(s) with...