Amines — Chemistry STD 12 Science — Question

Describe how does the enthalpy of reaction remain unchanged when a catalyst is used in the reaction.

Derive a formula to determine the molar mass of a solute by depression of freezing point.

Explain the different methods of preparing haloakanes from alcohols.

Answer the following questions:
Describe the preparation of potassium permanganate from pyrolusite ore. Write balanced chemical equation for one reaction to show the oxidizing nature of potassium permanganate.

1. The acid strength of alcohols decreases in the order

2. Phenol is more easily nitrated than benzene.

i. Write one chemical reaction for each
a. Carbylamine reaction
b. Acetylation reaction
ii. Write structure of N,N-ethylmethylethanamide

Explain the properties of vitamins and also classify them.

Graphically explain the effect of temperature on the rate constant of reaction. How can this temperature effect on rate constant be represented quantitatively?

Method of formation of solution is given in Column I. Match it with the type of solution given in Column II.

	Column I		Column II
(i)	Sulphur vapours passed through cold water.	(a)	Normal electrolyte solution.
(ii)	Soap mixed with water above critical micelle concentration.	(b)	Molecular colloids.
(iii)	White of egg whipped with water.	(c)	Associated colloid.
(iv)	Soap mixed with water below critical micelle concentration.	(d)	Macro molecular colloids.