Test: Electrolysis & Faraday's Laws - NEET

When during electrolysis of a solution of AgNO₃ ,9650 C of charge pass through the electroplating bath,the mass of silver deposited on the cathode will be

Refining of impure metal is done by electrolysis using impure metal as anode.Select the correct statement about this refining.

W g of Ag is deposited at the cathode of one electrolytic cell due to passage of 1A of current for 1h.Time required for passage of current to deposit W g of Mg by the same value of current is

In the refining of silver by electrolytic method, current of 5A is passed for 2 h using 100 g of impure anode of silver (of 95% purity). Weight of silver anode after electrolysis is

In the electrorefining of metals, impure metal is

In the electrosynthesis,potassium manganate (VII) is converted to manganese(IV) dioxide. By passage of 1F of electrolysis ,one mole of potassium manganate(VII) will form manganese dioxide.

When Al₂O₃ is electrolysed ,cation and anions are discharged. For a given quantity of electricity,ratio of number of moles of Al and O₂ gas is 

1 Faraday of electricity is passed through the solution containing 1 mole each of AgNO₃, CuSO₄, AlCl₃ and SiCl₄. Elements are discharged at the cathode.Number of moles of Ag, Cu,Al and Si formed will be in the ratio of  

During electrolysis of acidified water ,O₂ gas is formed at the anode. To produce O₂ gas at the anode at the rate of 0.224 cc per second at STP,current passed is

A solution of copper(II) sulphate (VI) is electrolysed between copper electrodes by a currrent of 10.0 A for exactly 9650 s.Which remains unchanged?

A 300 mL solution of NaCl was electrolysed for 60.0 min. If the pH of the final solution was 12.24,average current used is

100 mL of a buffer of 1 M NH₃(aq) and 1 M NH₄⁺(aq) are placed in two volatic cells separately.A current of 1.5 A is passed through both cells for 20 min. If electrolysis of water only takes place

2H₂O +O₂ + 4e^- → 4OH^- (RHS

2H₂O  → 4H^{+. + O₂} + 4e^- (LHS)

then pH of the 

What product are formed during the electrolysis of a concentrated aqueous solution of sodium chloride using an electrolytic cell in which electrodes are separated by a porous pot?

I. Cl₂(g)
II. NaOH(aq)
III. H₂(g)
IV. NaClO(aq)
V. NaClO₃(aq) 

Select the correct choice.  

One or More than One Options Correct Type

This section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Select the correct point(s) of distinction between a volatic cell and electrolysis cell.

In the electrolysis of aqueous sodium chloride solution, two types of reactions can take place at anode :

I. 2Cl^- (aq) → Cl₂(g) +2e^-

II. 2H₂O(l)g → O₂ (g) + 4H⁺(aq) + 4e^-

Select the correct statement(s) about these.

Select the correct statement(s) about electrolysis of aqueous CuSO₄ solution.

Select the correct observation about electrolysis.

Which pair of electrolysis could be distinguished by the products of electrolysis using inert electrodes?

Comprehension Type

This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d)

                                            Passage I

A constant current of 30 A is passed through an aqueous solution of NaCl for a time of 1.00 h.

Thus NaOH formed due to electrolysis is

                                                  Passage I

A constant current of 30 A is passed through an aqueous solution of NaCl for a time of 1.00 h.

Thus Cl₂ formed under STP condition is 

                                        Passage II

In hydrogen economy fuel-cell,anodic and cathodic reactions are 

Anodic

H₂+2OH^- → 2H₂O + 2e^-

Cathodic

O₂+2H₂O + 2e^- → 4OH^-

67.2 L H₂ at STP react in 15 min.Entire current is used for electro deposition of copper from copper(II) sulphate solution. Average current produced in fuel cell is   

                                     Passage II

In hydrogen economy fuel-cell,anodic and cathodic reactions are 

Anodic

H₂+2OH^- → 2H₂O + 2e^-

Cathodic

O₂+2H₂O + 2e^- → 4OH^-

67.2 L H₂ at STP react in 15 min.Entire current is used for electro deposition of copper from copper(II) sulphate solution. Copper deposited would be  

One Integer Value Correct Type

This section contains 6 questions, when worked out will result in an integer value from 0 to 9 (both inclusive)

Mⁿ⁺ solution was electrolysed for 75 min by a current of 0.30 A. Mass of the metal M deposited at the cathode was 9.958 g.Mⁿ⁺ contains 68 protons and 69 neutrons. What is the value of n?  

An electrochemical cell was based on the following reaction:

Mn(OH)₂(s) + H₂O₂(aq) → MnO₂(s) + 2H₂O (e)

During the opeartion of this for 1 min, 0.135 g of MnO₂ was produced. What is the average electric current (in ampere ) produced by the cell?  

In a fuel cell, following reactions takes place and electricity is produced. 

Anodic

H₂+2OH^- → 2H₂O + 2e^-

Cathodic

O₂+2H₂O + 4e^- → 4OH^-

If 100.8 L of H₂ at STP reacts in 96500 s,what is the average current produced (in ampere)?   

How long (in minutes ) a current of 1.56 A has to be passed through a solution of AgNO₃ to coat a metal surface of 80 cm² with a 0.010 mm thick layer? Density of silver is 10.5 g cm^-3.

A fully charged battery contains 500 mL of 5.00 M H₂SO₄. What is the concentration of H₂SO₄ in the battery after 6.0 A of current is drawn from the battery for 13.40 h?

A hydrogen-oxygen fuel cell opeartes on the simple reaction:

If the cell is designed to produce 1.46A of current and if the H₂ is contained in a 1.0 L tank at 2.00 atm pressure at 298K, how long can the fuel cell operate(in hour) before the H₂ runs out.(Assume unlimited supply of oxygen)   

Matching List Type

Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct

Four electrolytic cells containing solution of ZnSO₄, AgNO₃, CuSO₄ and dil. H₂SO₄ are connected in series. A steady current of 1.5 A was passed through them until 77 mL of O₂ gas at STP is formed in anode compartment of H₂SO₄ solution. Match the different elements/gas formed In Column I with their values in Column II and select the answer from the codes given below. (Cu = 63.5, Zn = 65, Ag = 108, S = 32, H = 1, 0 = 16) 
 

Codes   i       ii      iii      iv