_____ is a relative periodic property.

______ is an important metal to form amalgam.

The scientist who propounded the modern periodic law is ________.

________ and ________ are called inner transition elements

The chemical name of rust is____________

A is a reddish brown metal, which combines with O₂ at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B and C with reaction.

What is rust? Give the equation for formation of rust.

State two conditions necessary for rusting of iron.

a) State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.
b) Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition

Explain smelting process.

Metal A belongs to period 3 and group 13. A in red hot condition reacts with steam to form B. A with strong alkali forms C. Find A, B and C with reactions.