Metallurgy — Chemistry STD 10 — Question

Name the oxide of sulphur which reacts water to give sulphuric acid.
In the contact process, the direct reaction between oxide of sulphur and water is avoided. In this process what does the oxide of sulphur react with instead of water, and what is the name of the product?

What wilI you observed when concentrated HCI is added to lead (IV) oxide and warmed ?

Give reason for the following:
In the contact process, sulphur dioxide is dissolved in 98% sulphuric acid and not in water.

The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.

Sodium atom is highly reactive, but sodium ion is not. Explain.

Compare the compounds carbon tetrachloride and sodium chloride with regard to solubility in water and electrical conductivity.

In the formation of magnesium chloride (by direct combination between magnesium and chlorine) name the substance that is oxidized and the substance that is reduced.

Differentiate between:
Action on indicators or dry ammonia gas and aqueous ammonia