Question

'ous' acid of a non-metal 'X' has 2 'O' atoms. Per acid of the same non metal has the formula ...................

• A. $HX{O}_2$
• B. $H_{2}X{O}_4$
• C. $H_{2}X{O}_2$
• D. $HX{O}_4$

Answer 1

The correct option is D $HX{O}_4$

'Ous' acid is $HX{O}_2$ so
per acid is $HX{O}_4$
like:
Chlorous acid - $HCl{O}_2$
Perchloric acid - $HCl{O}_4$