Formulae of chemical compounds — task. Science State Board, Class 7.

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Select the correct formulae of chemical compounds:

1. Sodium chloride

None of these
${Na}_{2} Cl$
${Na}_{3} CO$
$NaCl$
${Na}_{2} O$

2. Ravi 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__________

${Ca}_{2} {CO}_{2} = 2 CaCO$
$Ca {CO}_{3}$
$Ca {Co}_{3}$
${Ca}_{2} {CO}_{3}$

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4. Formulae of chemical compounds

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