5. 20
11. 20
2. 24
20. 20
6. 20
Correct answer is B
P4 + 502 → P4O10
for the complete combustion of 124 grammes of phosphorus we need
5 x 22.4 litres of O2
for 12.4 gms of P4 we need
5×22.4124×12.41
22.42 = 11.2 litres
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