`H_(2)` evolved at STP on complete reaction of 27 g of aluminium with excess of aqueous NaOH would be

One mole of H_3PO_3 on reaction with excess of NaOH gives :

One mole of H_3PO_3 on reaction with excess of NaOH gives :

One mole of H_3PO_3 on reaction with excess of NaOH gives:

At STP , for complete combustion of 3 g C_(2)H_(6) the required volume of O_(2) will be -

At STP , for complete combustion of 3 g C_(2)H_(6) the required volume of O_(2) will be -

The volume of H_2 evolved at STP when 0.9 g of Al(molar mass : 27 g mol^(-1) ) is dissolved in excess of dilute H_(2)SO_(4) is

The volume of CO_(2) evolved at STP on heating 50g CaCO_(3)