Covalent Character

Q.

What is the oxidation state of $\mathrm{K}$ in ${\mathrm{KO}}_2$?

Q.

What is the oxidation number of $\mathrm{S}$ in ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$?

Q.

What is the oxidation number of $\mathrm{Fe}$ in ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$?

Q.

The oxidation states of $\mathrm{S}$ atoms in ${\mathrm{S}}_4{\mathrm{O}}_6^{2-}$from left to right respectively, are

1. $+6,0,0,+6$

2. $+3,1,+1,+3$

3. $+5,0,0,+5$

4. None of the above

Q.

What is the oxidation state of hydrogen in ${\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{H}}_2{\mathrm{O}}_2$ respectively?

Q.

What is the oxidation state of $\mathrm{Mn}$ in ${\mathrm{Mn}}_2{\mathrm{O}}_3$?

Q.

Calculate the oxidation number of sulphur, chromium and nitrogen in ${\mathrm{H}}_2{\mathrm{SO}}_5,{\mathrm{Cr}}_2{{\mathrm{O}}_7}^{2-}\mathrm{and}{\mathrm{NO}}_3^{-}$respectively.

Q.

What is the oxidation state of calcium in calcium carbonate$\left({\mathrm{CaCO}}_3\right)$?

1. +6

2. +5

3. +4

4. +1

5. +2

Q.

Which M--M bond has highest bond energy -

1. Sn - Sn

2. Ge - Ge

3. Si - Si

4. Pb - Pb

Q.

Which of the following elements has greater tendency to show +2 oxidation state ?

1. Lead

2. Carbon

3. Silicon

4. Germanium

Q.

Which of the following elements has greater tendency to show +2 oxidation state ?

1. Lead

2. Carbon

3. Silicon

4. Germanium

Q. Choose the wrong statement:

1. Ge, Sn and Pb form +2 as well as +4 oxidation state
2. $G{e}^{2+}$ and $S{n}^{2+}$ compounds act as reducing agents
3. $P{b}^{2+}$ compounds act as oxidizing agents
4. Stability incereases from $G{e}^{2+}toP{b}^{2+}$

Q.

Which M--M bond has highest bond energy -

1. Sn - Sn

2. Ge - Ge

3. Si - Si

4. Pb - Pb