Question

Gunmetal, which is used in journal bearings, contains          

(a) 88% Cu, 10% Sn, 2% Zn

(b) 80% Cu, 10% Zn, 10% Al

(c) 85% Cu, 5%, Mg, 10% Al

(d) 85% Cu, 5% Sn, 10% Pb