Question

An element ‘X’ is allowed to react with oxygen forms a compound ‘Y’. Compound ‘Y’ is
allowed to react with water to form a compound ‘Z’ which turns blue litmus paper red.
Identify X, Y and Z.

Answer 1

Since the oxide turns red litmus blue, therefore X is a metal because it is an alkaline oxide.

Most of the metals form respective metal oxides when react with oxygen.

Metal + Oxygen → metal oxide

Examples: (1) Reaction of potassium with oxygen:- Potassium metal forms potassium oxide when reacts with oxygen.

4K+O2→2K 2O

(2) Reaction of sodium with oxygen:- Sodium metal forms sodium oxide when reacts with oxygen.

4Na+O 2 →2Na 2O

Most metal oxides are insoluble in water but some of these dissolve in water to form alkalis. Sodium oxide and potassium oxide dissolve in water to produce alkalis.

Na 2O(s)+H 2O(l)→2NaOH(aq)

Answer 2

$\huge \mathfrak \pink{Answer}$

An element ‘X’ is allowed to react with oxygen forms a compound ‘Y’. Compound ‘Y’ is

allowed to react with water to form a compound ‘Z’ which turns blue litmus paper red.

Identify X, Y and Z.