The equivalent weight of a metal, 6 g of which evolve 5.6L of H2 at NTP from an acid is:

Wt. of metal = 6.0 g;volume at NTP = 5.6 L.We know that:Eq. wt. of a metal = wt. of metal VNTP of H2 in L×11.2L∴    Eq. wt. of metal =6.0g5.6L×11.2L=12.0g Ans.