Sulphuric Acid — Chemistry STD 10 — Question

What would you observe when Red litmus paper is introduced into a solution of ammonia in water?

The law where every 8th element repeats properties.

why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test?

Which type of reaction will Ethene undergo?

From the metals: copper iron, magnesium, sodium, and zinc, select a different metal in the case which:
does not react with dilute hydrochloric acid

Define or explain the term
Mole

Write balanced equation for the following reaction:
Reduction of copper oxide by hydrogen.

Name: A strong alkali

Distinguish between the following (using ammonia solution) Sodium sulphate and ammonium sulphate.