Correct Answer: Option D

Explanation

  First write a balanced equation for the chemical reaction:   

                                                                   2H\(_2\)    +   O\(_2\)  →  2H\(_2\)O

Mole ratio:                                                  2 moles    :     1 mole

Expected reacted volume:                       8 cm\(^3\)   :     20 cm\(^3\)

Actual reacted volume:                            8 cm\(^3\)   :      4 cm\(^3\)

Residual Volume(Expected - Actual):      0           :     16 cm\(^3\)           

Therefore, the volume of oxygen remaining is 16 cm\(^3\)                   

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