2.0g of metal carbonate is neutralised completely by 100 mL 0.1  N HCl. The equivalent weight of metal carbonate is:

Mass of metal carbonate, W=2.0 g.  Let E= equivalent weight of metal.But :Number of gram equivalent of HCl= Normality × Volume 1000=0.1×1001000=0.01.But no. of g equivalent of metal carbonate = no. of g. equivalent of HCL∴ W′E=0.01;E=W0.01=20.01=200