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নিচের কোনটি চায়নাক্লের সংকেত?

A l_{2} O_{3} S i O_{2} H_{2} O

A l_{2} O_{3} 2 S i O_{2} 2 H_{2} O

C a O A l_{2} O_{3} 6 S i O_{2}

N a_{2} O A l_{2} O_{3} 6 S i O_{2}

ANSWER : 2

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