Organic Chemistry — Chemistry STD 10 — Question

When an ammonium hydroxide solution is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide giving an inky blue solution. What is the cation present in solution B?

The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.

Why is Soda lime used not only NaOH?

Explain the following:
Ammonia is present in sewage water.

Ethane from sodium propionate.

Explain the term : Electro metallurgy

Name one lead compound that can be used to oxidize hydrogen chioride to chIorine.

The preparation of lead sulphate from lead carbonate is a two step process (lead sulphate cannot be prepared by adding dilute sulphuric acid to lead carbonate)
Why is the direct addition of dilute sulphuric acid to lead carbonate an impractical method of preparing lead sulphate?

Given one test can be used to detect the presence of the ion produced

Write equation to show the reaction between the following:
Copper and concentrated nitric acid.