Complete reaction of 2.0 g of calcium (at. wt. = 40) with excess HCL produces 1.125 L of H2 gas. Complete reaction of the same quantity of another metal "M" with excess HCL produces 1.85 L of H2 gas under identical conditions. The equivalent weight of "M" is closest to
Out of the following, which metal cannot displace hydrogen gas from dil HCl or dil H2SO4?