Question

What is the molecular formula for chalk?

• A. $N{a}_{2}C{O}_3$
• B. $Ca(HC{O}_3{)}_2$
• C. $CaC{O}_3$
• D. $CaC{l}_2$

Answer 1

The correct option is C

$CaC{O}_3$

Chalk is made up of calcium carbonate. It is the same compound which makes up the marble. Calcium carbonate's molecular formula is $CaC{O}_3$.