Question

the property by virtue of which mattress can be beaten into thin sheets is called ______ malleability/ductility.​

Answer 1

the property by virtue of which mattress can be beaten into thin sheets is called malleability

Answer 2

The property by the virtue of which metals can be beaten into thin sheets is called malleability.

ductility is the property due to which metals can be drawn into thin wires.

there you go :)