Universal indicator is added to an aqueous solution of oxide $$\(X\)$$. The indicator changes colour from green to red. What is $$\(X\)$$ ?
A.
MgO
B.
CaO
C.
\(\mathrm{K}_{2} \mathrm{O}\)
D.
Exam No：0620_s24_qp_13 Year：2024 Question No：21
Answer:
A
Knowledge points:
8.5.1. Describe the Group VIII noble gases as unreactive, monatomic gases and explain this in terms of electronic configuration
Solution:
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