Cement and its ingredients — task. Science State Board, Class 6.

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Choose the correct answer based on the topic cement:

1. The __________ chemical is present in \(19\) to \(24\%\) in cement.

Silicon
Silicon dioxide
Silicon oxide

2. __________ is the chemical formula for lime present in cement.

${Al}_{2} O_{3}$
$CaO$
${SiO}_{2}$

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