In this study a laboratory flotation machine (Denver, type D12) was used to investigate the interaction of hydrogen bubbles with the mineral surface and also to investigate the efficiency of hydrogen to float silica. Recovery of silica by using hydrogen and air as gas input was reported and compared. All the experimental parameters (pH of the suspension, gas flow rate, concentration of collector and frother, solids concentration, particle size and speed of impeller) except the choice of gas were kept same for both set of experiments. Almost similar recovery was reported by using both gases. It is observed that using molecular hydrogen gas instead of air does not enhance the recovery of silica significantly. Due to its composition, molecular hydrogen gas does not bring significant changes on silica surfaces comparing to air. It is evident that silica is insensitive to the choice of gas input (hydrogen or air). It can be concluded that the benefit of using hydrogen produced via electrolysis to float silica must be reduced to produce smaller bubble size only.