Question

The element whose oxide will turn red litmus solution to blue will be:
A. sodium
B. sulphur
C. carbon
D. phosphorus

Answer 1

carbon it is ( carbon monoxide CO)

Answer 2

A. sodium

Explanation:

The element whose oxide will turn red litmus solution to blue will be sodium. Sodium oxide reacts exothermically with cold water to produce sodium hydroxide solution. A concentrated solution of sodium oxide in water will have pH 14. It is basic because it contains the oxide ion, O2-, which is a very strong base with a high tendency to combine with hydrogen ions. So sodium oxide will turn red litmus to blue.

Option A is the answer.