What is the percentage of $H_{2}SO_{4}$ in concentrated $H_{2}SO_{4}$ (in $\%$)?

Which ore is concentrated by the froth flotation process?

The electronic configurations of three elements $X$, $Y$, and $Z$ are $X: {2, 8}$, $Y: {2, 8, 7}$, and $Z: {2, 8, 2}$. Which of the following is correct?

In the electrolytic refining of metals, the insoluble impurities present in the impure metal settle down at the bottom of the container below the anode. What is this called?

Give a reason why electrical wires are coated with plastic.

$A$ solution of $CuSO_{4}$ was kept in an iron pot. After a few days,the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Write the equation of the reaction involved.