Which of the following reacts with NaOH to liberate a gas ?

Which of the following reacts with NaOH to liberate a gas ?
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Which of the following reacts with NaOH to liberate a gas ? A. `P_(4)` (white phosphorus) B. `S_(8)` (rhombic sulphur) C. `Cl_(2)` D. C (graphite)
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