Question

How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane ? (Atomic weight of B = 10.8 u)

(1) 0.8 hours

(2) 3.2 hours

(3) 1.6 hours

(4) 6.4  hours

Answer 1

= 1 mole = 3 × 22.4 (at N.T.P. volume in litre)

t = 11580 sec = 3.21 hours

Comments

What is V suffix e ... How it  is taken as 5.6... please explain

Answer 2

Ans. (2)

water should be electrolysed

Comments

Why we taken the value 4 in right side... Please explain

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It's because
n-factor in 2H2O is "4"
2H2O→O2+4H + 4e
Since the n factor if 4
We took 4 there...
I hope u have understood the answer