P₄ + NaOH → PH₃ + NaH₂PO₂

The correct statement among the following is -

1. P is oxidized only.

2. P is reduced only.

3. P is oxidized as well as reduced.

4. Na is reduced.

The oxidation number of Ba in barium peroxide is :

1. +6

2. +2

3. 1

4. +4

Maximum oxidation state of Cr is :

1. 3

2. 4

3. 6

4. 7

The oxidation number of Cr in ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is:

1. +6

2. -7

3. +2

4. -2

Oxidation state of oxygen in hydrogen peroxide is :

1. -1

2. +1

3. 0

4. -2

$\mathrm{}$ \(2 \mathrm{MnO}_4^{-}+5 \mathrm{H}_2 \mathrm{O}_2+6 \mathrm{H}^{+} \rightarrow 2 \mathrm{Z}+5 \mathrm{O}_2+8 \mathrm{H}_2 \mathrm{O}\).In this reaction, Z is :

1. ${\mathrm{Mn}}^{2+}$

2. ${\mathrm{Mn}}^{4+}$

3. ${\mathrm{MnO}}_2$

4. Mn

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 potassium dichromate (K₂Cr₂O₇) are required to reduce 1 mole of  Sn ²⁺ in an acidic medium? 

1.  1/3

2. 1/6

3. 2/3

4. 1

${\mathrm{MnO}}_4^{2-}$ (1 mole ) in neutral aqueous medium will 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 ${\mathrm{MnO}}_2$