Which of the following is the most powerful oxidizing agent ?

1. ${\mathrm{F}}_2$

2. ${\mathrm{Cl}}_2$

3. ${\mathrm{Br}}_2$

4. ${\mathrm{I}}_2$

Nitrogen show different oxidation states in the range :

1. 0 to +5

2. -3 to +5

3. -5 to +3

4. -3 to +3

How many moles of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ can be reduced 1 mole of ${\mathrm{Sn}}^{2+}$?\

1.  1/3

2. 1/6

3. 2/3

4. 1

${\mathrm{MnO}}_4^{2-}$ (1 mole ) in neutral aqueous medium is disproportionate to :

1. 2/3 mole of ${\mathrm{MnO}}_4^{-}$ and 1/3 mole of ${\mathrm{MnO}}_2$

2. 1/3 mole of ${\mathrm{MnO}}_4^{-}$ and 2/3 mole of ${\mathrm{MnO}}_2$

3. 1/3 mole of ${\mathrm{Mn}}_2{\mathrm{O}}_7$ and 1/3 mole of ${\mathrm{MnO}}_2$

4. 2/3 mole of ${\mathrm{Mn}}_2{\mathrm{O}}_7$ and 1/3 mole of ${\mathrm{MnO}}_2$

The oxidation number of oxygen in ${\mathrm{KO}}_3$ $\mathrm{and}$ ${\mathrm{Na}}_2{\mathrm{O}}_2$ is respectively -

1. 3, and 2
2. 1, and 0
3. 0, and 1
4. -0.33, and -1

The oxidation number of phosphorus in \(Ba \left(H_{2} PO_{2}\right)_{2}\) is-

1. -1

2. +1

3. +2

4. +3

2 mole of ${\mathrm{N}}_2{\mathrm{H}}_4$ loses 16 mole of electron is being converted to a new compound X. Assuming that all of the N appears in the new compound. What is the oxidation state of 'N' in X ?

1. -1

2. -2

3. +2

4. +4

When ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is converted to ${\mathrm{K}}_2{\mathrm{CrO}}_4$, the change in the oxidation state of chromium is :

1. 0

2. 6

3. 4

4. 3

When a manganous salt is fused with a mixture of ${\mathrm{KNO}}_3$ and solid NaOH, the oxidation number of Mn changes from +2 to :

1. +4

2. +3

3. +6

4. +7

In $\mathrm{Fe}\left(\mathrm{II}\right)-{\mathrm{MnO}}_4^{-}$ titration, ${\mathrm{HNO}}_3$, is not used because :

1. it oxidises ${\mathrm{Mn}}^{2+}$

2. it reduces ${\mathrm{MnO}}_4^{-}$

3. it oxidises ${\mathrm{Fe}}^{2+}$

4. it reduces ${\mathrm{Fe}}^{3+}$ formed