Question:নিচের কোনটি ক্ষারকীয় অক্সাইড? 

A P<span style="font-size: xx-small;"><sup>4</sup></span>Q<span style="font-size: xx-small;"><sup>10</sup></span> 

B CO 

C M<span style="font-size: xx-small;">g</span>O 

D Z<span style="font-size: xx-small;">n</span>O 

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