The strength of 11.2 volume solution of H₂O₂ is : [Given that molar mass of H = 1 g mol–1 and O = 16 g mol^–1]

100 mL of a water sample contains 0.81 g of calcium bicrabonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaCO₃ is : (Molar mass of calcium bicarbonate is 162 g mol^–1 and magnesium bicarbonate is 146 g mol^–1)

The volume strength of 1M H₂O₂ is : (Molar mass of H₂O₂ = 34 g mol^–1)

The correct statements among (a) to (d) regarding H₂ as a fuel are :

(a)   It produces less pollutants than petrol.

(b)   A cylinder of compressed dihydrogen weighs $$ \sim $$ 30 times more than a petrol tank producing the same amount of energy.

(c)   Dihydrogen is stored in tanks of metal alloys like NaNi₅.

(d)   On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 KJ, respectively.