German silver is an alloy of

Granite mainly composed of quartz and felsper particles, is obtained from

If the ore impurities is

The slag which floats on the surface of the molten iron generally contains

Quick lime

The material generally not used as extender in paints, is

Pozzolana (or surkhi) is used in lime

The low voltage porcelain is mainly used for

Non acid-resistant asbestos is :