Which of the following is a non-metal that remains liquid at ordinary temperature?

Gold is soluble in

Copper does not react with dilute HCl but reacts in the presence of air or oxygen because

Coloured glass for goggles contains

The filament of an electric bulb is made up of

Match List I with List II and select the correct answer from the codes given below.             List I                            List III I.          Lead                            (A) Haematite II.         Iron                              (B) Biotite III.        Mica                             (C) Galena IV.       Aluminium                     (D) Bauxite

Solder metal is an alloy of

The purest form of iron is

Matrix is defined as

The flux used in the blast furnace to remove the unwanted impurities is