Periodic Table, Periodic Properties and Variations of Properties — Chemistry STD 10 — Question

Write balanced equation and name the product formed when :
Cupric oxide reacts with nitric acid.

Valency of elements in group I.

Give reason for the following:
In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.

What do you mean by stoichiometry?

A compound with six water of crystallisation.

Which method of refining is used to get 99.8% pure aluminium?

Correct the following statement :
Equal masses of all gases under identical conditions contain the same number of molecules.

State two observations when
Lead nitrate crystals are heated in a hard glass test tube.

Name:
a compound containing zinc in the anion