The chemical formula of the carbon dioxide can be-

A. $\mathrm{CO}$

B. ${\mathrm{CO}}_2$

C. ${\mathrm{C}}_2{\mathrm{O}}_3$

"Enter your correct answer as A, B or C."

The chemical formula of methane is-

A. ${\mathrm{C}}_2{\mathrm{H}}_4$

B. ${\mathrm{CH}}_4$

C. ${\mathrm{C}}_2{\mathrm{H}}_2$

"Enter your correct answer as A, B or C."

The chemical formula of the sulphur trioxide is-

A. $\mathrm{SO}$

B. ${\mathrm{SO}}_2$

C. ${\mathrm{SO}}_3$

"Enter your correct answer as A, B or C."

The chemical formula of the carbon disulphide is-

A. ${\mathrm{CS}}_2$

B. $\mathrm{CS}$

C. ${\mathrm{C}}_2\mathrm{S}$

"Enter your correct answer as A, B or C."

The chemical formula of the sodium oxide is-

A. $\mathrm{NaO}$

B. ${\mathrm{Na}}_2\mathrm{O}$

C. ${\mathrm{NaO}}_2$

"Enter your correct answer as A, B or C."

Write the chemical formula of the calcium phosphate.

Write the chemical formula of the magnesium hydroxide.

A. $\mathrm{Mg}{\left(\mathrm{OH}\right)}_3$

B. $\mathrm{MgOH}$

C. $\mathrm{Mg}(\mathrm{OH}{)}_2$

"Enter your correct answer as A, B or C."

Write the numerical value of '$\mathrm{x}$' in the chemical formula for potassium sulphate given:

${\mathrm{K}}_{\mathrm{x}}{\mathrm{SO}}_4$