Element M reacts with oxygen to form an oxide with the formula MO. When MO is dissolved in water, the resulting solution is basic. Element M could be __________.
A)Na
B)Ba
C)S
D)N
E)C

Question

Quizplus · Accepted Answer

If the resulting solution is basic, it means that the oxide MO produced hydroxide ions (OH-) when dissolved in water. 
Out of the options given, BaO (barium oxide) is a strong base and will produce hydroxide ions when dissolved in water.

Element M Reacts with Oxygen to Form an Oxide with the Formula