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72 % S i O_{2}, 22 % N a_{2} O a n d 6 % C a O

72 % S i O_{2}, 22 % N a_{2} O a n d 6 % H g

70 % S i O_{2}, 24 % F e (O H)_{3} a n d 6 % F e_{2} O_{3}

72 % S i O_{2}, 20 % N a_{2} O a n d 8 % C a O

None

ANS : 1

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