1.

When electriccurrentis passedthroughacidifiedwaterfor 1930s 1120 mL of H_(2)gas is collected(at sTP) at the cathode what is the curent passed in amperes

Answer»

0.05
0.5
5
50

Solution :ELECTROLYSIS of watertakes places as follws
`H_(2)O rarr H^(+) + OH^(-)`
Giventime t = 1930 S
Numberof moles of hydrogen collected
`=(1120xx10^(-3))/(22.4)` MOL = 0.05 mol
`because`1 moleof hydrogenis deposited 2 MOLESOF electron `therefore`0.05 molesof hydrogen willl be deposited
` = 2 xx0.05 = 0.10`moleof electrons
chargeQ= nF = `0.1 xx965000`
Charge Q = it
`0.1 xx96500 =i xx1930`
`i=(0.1 xx96500)/(1930)=5.0 A`


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