‘x’ grams of a metal reacts with excess of acid to liberate 5.6 litres of hydrogen at STP. Gram equivalent weight of the metal is---- g

Volume of hydrogen liberated at STP=5.6 litres; GMW of hydrogen=2 g; 2 grams of  hydrogen occupy 22.4 lit at STP; ∴weight of hydrogen produced=0.5 g; GEW of hydrogen=1 g ; Weight of metal=x ; GEW of metal=? WMWH=EMEH; x0.5=EM1; EM=2x ;