As the concentration of $[H_{3}O^{+}]$ ions increases in an acidic aqueous solution,what happens to the nature of the solution?

Which solution will be basic?

The concentration of $H_{3}O^{+}$ in $1\,M\,H_{2}SO_{4}$ aqueous solution is $.......$ (in $,M$)

The marble statues are often slowly corroded when kept in the open for a long time. Give a suitable reason.

How many moles are there in $4.9 \ g$ of $H_{2}SO_{4}$?

$A$ metal $M$ forms an oxide with the formula $M_{2}O_{3}$. It dissolves in both dilute sulphuric acid and dilute sodium hydroxide solution. Identify the metal and write the chemical equations for the reactions involved.