Amines — Chemistry STD 12 Science — Question

Answer the following questions:
Write balanced equations to represent what happens when.

1. Cu²⁺ is treated with KI.
2. Acidified potassium dichromate solution is reacted with iron (II) solution. (ionic equation).

1. Account for the following:

1. Transition metals form large number of complex compounds.
2. The lowest oxide of transition metal is basic whereas the highest oxide is amphoteric or acidic.
3. E° value for the Mn³⁺/Mn²⁺ couple is highly positive (+1.57 V) as compare to Cr³⁺/Cr²⁺. 56/1/1 9.

2. Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.

Explain the electrophilic substitution reactions of amine.

1. Write the steps involved in the preparation of: 

1. K₂Cr₂O₇ from Na₂CrO_4.
2. KMnO₄ from  K₂MnO_4.
3. Calomel from corrosive sublimate.

2. What is meant by lanthanoid contraction? What effect does it have on the chemistry of the elements which follow lanthanoids?

Explain the effect of substitutents on the basic strength of aromatic amines.

Describe different electrophilic substitution reaction of chlorobenzene.

What is the relationship between Gibbs free energy of the cell reaction in a galvanic cell and the emf of the cell? When will the maximum work be obtained from a galvanic cell?