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চিনামাটির সংকেত কোনটি?

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

K_{2} O . A l_{2} O_{3} . 6 S i O_{2}

N a_{2} C O_{3} . C a C O_{3} . S i O_{2}

N a_{2} C O_{3} . A l_{2} O_{3} . 2 S i O_{2}

ANS : 1

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