A student in a view to obatin sodium metal at the cathode, carried out the electrolysis of NaCI solution. He did not get sodium at the cathode, instead he got two gases at the electrodes.Why he did not get Sodium?

A student in a view to obatin sodium metal at the cathode, carried out the electrolysis of NaCI solution. He did not get sodium at the cathode, instead he got two gases at the electrodes. _________ gas produced at each electrode.

During the electrolysis of aqueous solution of sodium sulphate, on cathode we get

Why is hydrogen formed at the cathode instead of sodium in electrolysis of aqueous sodium chloride?

a) What are the products obtained at anode and cathode during the electrolysis of molten sodium chloride? b) If the aqueous solution of sodium chloride is subjected to electrolysis, What are the prod ucts obtained reach electrode?

a) When the aqueous solution of sodium chloride is subjected to electrolysis, what are the products obtained at each electrode. b) Write the chemical equation occur at cathode?

Anoop was calculating the sum of the consecutive natural numbers from 1. At one stage he got 2485 as the sum. How many natural numbers did Anoop use to get this sum?

A scientist dissolved sodium metal in liquid NH_3 . He got a coloured solution. When the solution was kept for sometime then observed a gas buddling out. Give the colour of the solution and identify the gas evolved. Discuss the chemistry involved.

Fuel cells are galvanic cells in which the chemical energy of fuel is directly converted into electrical energy. Type of fuel cell is a hydrogen - oxygen fuel cell. It consists of two electrodes made up of two porous graphite impregnated with a catalyst (platinum, silver, or metal oxide). The electrodes are placed in aqueous solution of NaOH. Oxygen nad hydrogen are continuously fed into the cell. Hydrogen gets oxidized to H^(oplus) which is neutralized by overset(Θ)(OH) , ie., anodic reaction. H_(2) hArr 2H^(oplus) + 2e^(-) 2H^(oplus) + 2 overset(Θ)(OH) hArr 2H_(2)O H_(2) + 2 overset(Θ)(OH) hArr 2H_(2)O + 2e^(-) At cathode, O_(2) gets reduced to overset(Θ)(OH) i.e., O_(2) + 2H_(2)O + 4e^(-) hArr overset(Θ)(4)OH Hence, the net reaction is 2H_(2) + O_(2) hArr 2H_(2)O The overall reaction has Delta H= -285.6kJ mol^(-1) and Delta G= -237.4kJ mol^(-1) " at " 25^(@)C Suppose the concentration of hydroxide ion in the cell is doubled, then the cell voltage will be

Which of the following statements are correct? Fuel cells are galvanic cells in which the chemical energy of fuel is directly converted into electrical energy. Type of fuel cell is a hydrogen - oxygen fuel cell. It consists of two electrodes made up of two porous graphite impregnated with a catalyst (platinum, silver, or metal oxide). The electrodes are placed in aqueous solution of NaOH. Oxygen nad hydrogen are continuously fed into the cell. Hydrogen gets oxidized to H^(oplus) which is neutralized by overset(Θ)(OH) , ie., anodic reaction. H_(2) hArr 2H^(oplus) + 2e^(-) 2H^(oplus) + 2 overset(Θ)(OH) hArr 2H_(2)O H_(2) + 2 overset(Θ)(OH) hArr 2H_(2)O + 2e^(-) At cathode, O_(2) gets reduced to overset(Θ)(OH) i.e., O_(2) + 2H_(2)O + 4e^(-) hArr overset(Θ)(4)OH Hence, the net reaction is 2H_(2) + O_(2) hArr 2H_(2)O The overall reaction has Delta H= -285.6kJ mol^(-1) and Delta G= -237.4kJ mol^(-1) " at " 25^(@)C A fuel cell is I. A voltaic cell in which continuous supply of fuels are sent at anode to perform oxidation II. A voltaic cell in which fuels such as CH_(4), H_(2) and CO are used up at anode. III. One which involves the reaction of H_(2)- O_(2) fuel cell such as: Anode 2H_(2) + 4 overset(Θ)(OH) rarr 4H_(2)O(I) + 4e^(-) cathode : O+ 2H_(2)O(I) + 4e^(-) rarr 4 overset(Θ)(OH) IV. The efficiency of H_(2)-O_(2) fuel cell is 70 to 75%