The oxidation number of carbon in C₃O₂  and Mg₂C₃ are respectively:

1. -4/3, +4/3 

2. +4/3, -4/3

3. -2/3, +2/3

4. -2/3, +4/3

Which metal exhibits more than one oxidation states?

1. Na

2. Mg

3. Al

4. Fe

The decomposition of KClO₃ to KCl and O₂ on heating is an example of:

1. intermolecular redox change

2. intramolecular redox change

3. disproportionation or auto redox change

4. none of the above

Among the following, In which iron has the lowest oxidation state?

1. Fe(CO)₅

2. Fe₂O

3. K₄Fe(CN)₆

4. FeSO₄.(NH₄)₂SO₄.6H₂O

Reducing agent among the following is -

The equivalent mass of a reductant or an oxidant is given by:

1. Eq. mass = $\frac{molar mass of reduc\tan t or oxidant}{no. of electrons lost or gained by 1 molecule of reduc\tan t or oxidant}$

2. Eq. mass = $\frac{molar mass}{valence}$

3. Eq. mass = $\frac{molar mass}{total charge on cation or anion}$$$

4. All of the above

NaH+ H₂O $\to$NaOH + H₂:

The correct statement for above mentioned reaction among the following is-

1. H^- is oxidised

2. Na⁺ is reduced

3. Both NaH and H₂O are reduced 

4. None of the above

When an acidified solution of ferrous ammonium sulphate is treated with KMnO₄ solution, the ion that gets oxidised is:

1. Fe²⁺

2. S${\mathrm{O}}_4^{2-}$

3. N${\mathrm{H}}_4^{+}$

4. Mn${\mathrm{O}}_4^{-}$

In the reaction, 

Cr₂${\mathrm{O}}_7^{2-}$ +14H⁺ + 6I^- $\to$2Cr³⁺ + 7H₂O + 3I₂,

Which element is reduced?

1. I

2. O

3. H

4. Cr

2Na₂S₂O₃ + I₂ $\to$ Na₂S₄O₆ + 2NaI,

the oxidation state of sulphur in tha above reaction:

1. Decreases

2. Increases

3. Remain unchanged

4. None of the above