Organic Chemistry — Chemistry STD 10 — Question

Explain the reason :
Why 'food containing iron salts' should not be cooked in aluminium utensils?

Name the following:
A metal which is always present in the amalgam.

In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium.

State the composition of aqua regia. State which component is the oxidizing agent in aqua regia.

Name the electrode from which aluminium is collected in Hall-Heroult's process.

A halogen in period 3.

The process by which a particle gains or loses electrons.

Name the acids, which are used in food industry.

A, B, C are three elements in which B is an inert gas other than helium.With this information complete the following table.

Element	Atomic number	No. of electrons in the valence shell	Group to which the element belongs
A	Z - 1
B	Z
C	Z + 1

Also, explain the following : Ionization energy of element C is less than that of element A.