Match the following.

Give scientific reasons.

Gold and platinum are called noble elements.

Give scientific reasons.

Stainless steel has more lustre than iron.

Fill in the blanks.

(a) Gold of 100% purity is _______ carat gold.

(b) Bronze contains the metals _______ and _______.

(c) The _______ gas is released when metals react chemically with acids

(d) Oxides of metals have _______ properties.

(e) The non-metal _______ is used in gun powder.

Find out which metals are used to make varakh, the shiny foil that is used to garnish sweetmeats.