Oxidation Number

The oxidation state of Cr in  ${[\text{Cr}{({\text{NH}}_{\text{3}})}_{\text{4}}{\text{Cl}}_{\text{2}}]}^{+}$  is

What is the trend of oxidation number for elements in Group-$14$?

What is the trend of oxidation number for elements across period-$3$?

Give an example of limitation of oxidation number concept.

Write the limitation of oxidation number concept.

What is the similarities and the difference between the oxidation number and oxidation state.

Calculate the oxidation state of the alkaline earth metal in the compound $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$.

What is the oxidation state of the alkaline earth metal in the compound $\mathrm{MgO}$?

Give the usual oxidation state of alkaline earth metals.

${\mathrm{CrO}}_5$ has a structure as shown below:

The oxidation number of chromium in the above compound is 

${\mathrm{CrO}}_5$ has structure as shown

The oxidation number of chromium in the above compound is _____.$(+6/+10)$

Which of the following oxidation states is/are shown by hydrogen?

Which statement is not correct about ${\mathrm{CH}}_2={\mathrm{CCl}}_2 ?$

The oxidation state of chromium in the final product formed by the reaction between $\mathrm{KI}$ and acidified potassium dichromate solution is

$1$ mole of ${\mathrm{FeSO}}_4$ (atomic weight is $55.84 \mathrm{g} {\mathrm{mol}}^{-1}$) is oxidized to ${\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3$. Calculate the equivalent weight of ferrous ion

One mole of hydrazine $\left(N_2{H}_4\right)$ loses 10 moles of electrons in a reaction to form a new compound $X.$ Assuming that all the nitrogen atoms in hydrazine appear in the new compound, what is the oxidation state of nitrogen in $X$ ? (Note There is no change in the oxidation state of hydrogen in the reaction)

Which of the following oxidation states is/are shown by hydrogen?

What is the oxidation state of $\mathrm{I}$ in ${\mathrm{INO}}_3$?

What is the oxidation number of copper in brass?