Question:কাঁচ কি দিয়ে তৈরী? 

A MnO<span style="font-size: xx-small;"><sub>2</sub></span> 
B SiO<span style="font-size: xx-small;"><sub>2</sub></span> 
C BaO 
D B<span style="font-size: xx-small;"><sub>2</sub></span>O<span style="font-size: xx-small;"><sub>3</sub></span> 

+ Answer
B 

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Md. Saydul Alam

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