Formulae of chemical compounds — task. Assessments, Science TN.

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Mukesh went to shop to buy a toothpaste and he noticed the one of the compositions of toothpaste is calcium carbonate which can be written in chemical formula as__________

$2Ca {CO}_{3}$
$Ca {CO}_{2}$
$Ca {CO}_{3}$
${Ca}_{2} {CO}_{3}$

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2. Formulae of chemical compounds

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