Tamil Nadu Board Solutions for Chapter: Periodic Classification of Elements, Exercise 3: TEXTBOOK EVALUATION

Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.

The electronic configuration of metal A is $2,8,18,1$. The metal A when exposed to air and moisture forms B a green layered compound. A with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ forms C and D along with water. D is a gaseous compound. Find A, B, C and D.

Explain the 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.

Name the acid that renders aluminium passive. Why?

Identify the bond between $\mathrm{H}$ and $\mathrm{F}$ in the $\mathrm{HF}$ molecule.

What property forms the basis of identification?

How does the property vary in periods and in groups?