Question

22. Why is a metal oxide called a basic oxide? Name the products obtained when
copper oxide reacts with dilute hydrochloric acid.
OR
The test tube 'A' contains distilled water, test tube 'B' contains acidic solution
and test tube ‘Cºcontains basic solution. How could these samples be identified
using red litmus paper.​

Answer 1

Answer:

1) Metallic oxides are basicin nature because theyreact with dilute acids to form salt and water.Copper(II) oxide dissolves in mineral acids such ashydrochloric acid, sulfuricacid or nitric acid to give the correspondingcopper(II) salts. ... CuO + 2HCl → CuCl2 + H2O.

or

2) One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. ... The solution from the test tube which turns bluelitmus paper to red will be the acidic solution andsolution of the test tubewhich do not change eitherred or blue litmus paper contain water.

Answer 2

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