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Percentage of Nitrogen in air by Volume is : 76 , 78 , 80 , 82
Which compound is used as a raw material for the preparation of Shaving cream : Potassium Hydroxide , Sodium Hydroxide , Magnesium Hydroxide , Calcium hydroxide
Which catalyst is used for oxidation of SO2 in contact process : P2O5 , AI2O3 , V2O5 , Fe2O3
General formula of Alkynes is : C nH 2n , CnH2n-1 , CnH2n+1 , CnH2n-2