Correct Answer: Option A

Explanation

Gay Lussac’s Law of Combining Volumes states that when gases react, they do so in volumes which bear a simple ratio to one another, and to the volume of the product(s) formed if gaseous, provided the temperature and pressure remain constant. 

                                      C\(_2\)H\(_{4(g)}\)  +  3O\(_{2(g)}\) → 2CO\(_{2(g)}\)  +  2H\(_2\)O\(_{(g)}\)

                                         1 mole      :       3 moles

Total volume required:     10 cm\(^3\)          50 cm\(^3\)

Reacted Volume:              10 cm\(^3\)          30 cm\(^3\)

Residual volume:               0                    (50 - 30) = 20 cm\(^3\)

There is an explanation video available below.

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