When zinc rod is directly placed in copper sulphate solution:

1. The blue colour of the solution starts intensifying.

2. The solution remains electrically neutral.

3. The temperature of the solution falls.

4. The weight of the zinc rod starts increasing.

The oxidation number of sulfur in \(H_2SO_4\)​ is +6, and in \(H_2S_2O_8\)​, it is also +6. When \(H_2SO_4\)​ is converted into \(H_2S_2O_8\)​, what type of process occurs during this conversion?

1. Oxidation 

2. Reduction 

3. Neither oxidation nor reduction 

4. Oxidation as well as reduction 

What enables HNO₂ to act as both a reducing and an oxidizing agent, in contrast to HNO₃ which only acts as an oxidizing agent?

1. Hybridization of N-atom in HNO₂

2. Maximum oxidation state of N - atom in HNO₂

3. Lower oxidation state of N-atom in HNO₂

4. Higher electronegativity of N -atom in HNO₃