Electrochemistry MCQs for NEET — Chemistry Questions with Answers

If 4 L 0.8 M aqueous solution of AgNo_3 is electrolysed between inert electrodes by passing 5A current for 10 hours then what will be the decrease in the concentration of $ Ag ^ + _{(aq)} $ in the solution? ( efficiency of current 80 % )

To produce 100 ml $ O_2 gas per minute at 25 ^ \circ C $ temperature and 1 bar pressure by electrolysis of water how much electric currenty should be passsed through the water ? Efficiency of current is 90% .

For how much time 10 A current should be passed through the molten NaCl to obtain 36.47 g of sodium metal at cathode? Efficiency of current is 85 % ($ At.wt Na = 23 g mol ^ {(-1)}$)

When 5 L aqueous solution of $ CuSO_4 $ is electrolysed between inert electrodes by passing 25 A current its concentration decreases from 2.0 M to 1.2 M then theoritically for how much time current would have been passed ?

What is the correct order of specific conductance of given metals?

When 10 L aqueous solution of $ CuSO_4 $ is electrolysed between inert electrodes by passing electric current for 20 hours its concentration decreases from 0.7 M to 0.2 M then how much electric current would have been passed ?

On the basis of given data match the convounds of group 1 with values of molar conductivity at infinite dilution $ \lambda ^ \circ _{m {Mg ^ {2+}} = 106 S.cm^2 .mol ^ {-1} $
$ \lambda ^ \circ _{m {Ca^ {2+}} = 119 S.cm^2 .mol ^ {-1} $
$ \lambda ^ \circ _{m {Cl ^ {-}} = 76. 3 S.cm^2 .mol ^ {-1} $
$ \lambda ^ \circ _{m {SO_4 ^ {2-}} = 106 S.cm^2 .mol ^ {-1} $
Group 1 compounds (i) $ MgSö_4 $
(ii) $ CaCl_2 $
(iii) $ MgCl_2 $
(iv) $ CaSO_4 $ $ Group 2 A ^ \circ _m S . cm ^2 . mol ^ {-1} $ (A) 195.3 (E) 182.3 (B) 279 (F) 266 (C) 186 (G) 219.5 (D) 271.6 (H) 258.6

If at constant temperature specific conductance of aqueous solution of KCI is $ x mho. (cm) ^{-1} and on measuring its resistance it is found to be y \Omega . with the same instrument if resistance of aqueous solution of NaCl is found to be z \Omega then what will be its specific conductance?

Using 2 g Hg cathode Cd—Hg amalgam is obtained by electrolysis Of $ CdCl_2 $ then how much ampere electric current should be passed for 1000 seconds to obtain Cd-Hg having Cd? ($ At.wt Cd = 112.5 g mol ^ {-1} $ )

$ A_m - A_m ^ \circ - A.C ^ {1 \over 2 } $ is related to which compound?