Question

Acertain current liberates 0.504 g of hydrogen in 2 hours. How many grams of oxygen can be liberated by the same current in the same time?

(a) 2.0 g
(b) 0.4 g
(c) 4.0 g
(d) 8.0 g

Answer 1

Correct option is (c) 4.0 g

H₂O → H₂ + 1/2 O₂

Thus if one mole of H₂ is liberated, O₂ liberated = 1/2 mole