1.

A mixture of hydrogen and oxygen is evolved when a dilute solution of NaOH is electrolysed. How many moles of each gas would be liberated by a current which deposited 20.942 of Ag ?

Answer»

Solution :1 mole (faraday) ELECTRIC yields 1 equivalent of matter.
`therefore` equivalent of Ag `= (20.942)/(108)`
`therefore` mole of electric CHARGE `= (20942)/(108)` faraday.
SINCE the same amount of electricity is passed through diliute NaOH solution,
equivalent of hydrogen liberated `= (20.942)(108)`
and equivalent of OXYGEN liberated `= (20.942)/(108)`
`{:(therefore " mole of " H_(2)" liberated " = (20.942)/(108) xx (1)/(2) = 0.97),("mole of " O_(2) " liberated " = (20.942)/(108) xx (1)/(4) = 0.0485):}}`


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