Correct Answer: Option A

Explanation

Equation of the reaction

                              2\(H_2 + O_2  → 2(H_2O_2\))

no of moles:              2         1         →     2

initial volume: 60cm\(^3\) 20cm\(^3\)         0cm\(^3\)

vol used         40cm\(^3\)     20cm\(^3\)           -----

after sparking 20cm\(^3\)   0cm\(^3\)           40cm\(^3\)

Therefore, the total volume of residual gases = 20cm\(^3\) left of hydrogen + 40cm\(^3\) of stream produced = 60cm\(^3\)                 

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