What is the maximum percentage of available chlorine in a given bleaching powder sample (take the formula of bleaching powder as ${\mathrm{CaOCl}}_2$)?

A $0.2 \mathrm{g}$ of a sample containing copper$\left(\mathrm{II}\right)$ was analysed iodometrically, where copper$\left(\mathrm{II}\right)$ is reduced to copper$\left(\mathrm{I}\right)$ by iodide ions as follows, $2{\mathrm{Cu}}^{2+}+4{\mathrm{l}}^{-}⟶2\mathrm{Cul}+{\mathrm{I}}_2$. If $20\mathrm{mL}$ $0.1 \mathrm{M} {\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ solution is required for the titration of the liberated iodine, then the percentage of copper in the sample will be

A substance which participates readily in both acid-base and oxidation-reduction reactions is

The amount of lime, $\mathrm{Ca}(\mathrm{OH}{)}_2$ required to remove the hardness in $60 \mathrm{L}$ of pond water containing $1.62 \mathrm{mg}$ of calcium bicarbonate per $100 \mathrm{mL}$ of water is

Predict the products when the following reactions are carried out:

$\mathrm{HCl}+{\mathrm{KlO}}_3+\mathrm{Kl}⟶$

When $\mathrm{ZnS}$ is boiled with strong nitric acid, the products are zinc nitrate, sulphuric acid and nitrogen dioxide. What are the changes in the oxidation numbers of $\mathrm{Zn},\mathrm{S}$ and $\mathrm{N}$:

Balance the following equation and choose the quantity which is the sum of the coefficients of reactants and products:

$...{\mathrm{KMnO}}_4+...{\mathrm{H}}_2{\mathrm{O}}_2+...{\mathrm{H}}_2{\mathrm{SO}}_4...\to {\mathrm{MnSO}}_4+...{\mathrm{O}}_2+....{\mathrm{H}}_2\mathrm{O}+....{\mathrm{K}}_2{\mathrm{SO}}_4$

Among the following compounds given below, what is the sum of the oxidation states of all underlined elements?

$\underline{\mathrm{C}}{\mathrm{O}}_2, {\mathrm{K}}_2\underline{\mathrm{Mn}}{\mathrm{O}}_4$