Question

Under the normal conditions, which of the given oxides when reacted with water turns red litmus blue?

• A. $N{a}_{2}O$
• B. $CaO$
• C. $MgO$
• D. $N{O}_2$

Answer 1

Answer: (A), (B), (C)

$MgO$

$N{a}_{2}O,CaO$ and $MgO$ are basic in nature because these metal oxides when reacted with water form alkaline solutions while $N{O}_2$ is acdic in nature and forms acidic solutions.

Red litmus turns blue in the basic solution.