A) 10 mL of\[{{O}_{2}}\]
B) 10 mL of\[{{H}_{2}}\]
C) 5 mL of\[{{H}_{2}}\]
D) 5 mL of \[{{O}_{2}}\]
Correct Answer: D
Solution :
Hydrogen and oxygen reacts as follows: \[2{{H}_{2}}+{{O}_{2}}\to 2{{H}_{2}}O\] \[\begin{align} & \text{2}\,\text{mole}\,\,\,\,\text{1}\,\text{mole}\,\,\,\,\text{2}\,\text{mole} \\ & \text{2}\,\text{vol}\,\,\,\,\,\,\,\,\,\text{1}\,\text{vol}\,\,\,\,\,\,\,\,\,\,\text{2}\,\text{vol} \\ & \text{30}\,\text{mL}\,\,\,\,\,\,\text{15}\,\text{mL}\,\,\,\,\,\,\text{30}\,\text{mL} \\ \end{align}\] Here, hydrogen is the limiting reagent as it is completely consumed while oxygen is the excess reagent. Oxygen left = 20 mL - 15 mL = 5 mL. Hence, the correct option is (d).
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