● Mortar is a bonding agent which is generally produced by mixing cementing or binding material (lime or cement) and fine aggregate (sand, surki, sawdust, etc.) with water. ● Even a small percentage of mica, if present, considerably lowers the tensile strength and adversely affects the compressive strength. ● It requires about twice as much cement to produce mortar of a given strength when fme sand is used as it does with coarse sand. ● Cement lime mortars are helpful in autogenously healing of cracks. Hence given statement in option (d) in correct incase of mortar