Amines — Chemistry STD 12 Science — Question

Describe the methods of studying various first order reactions with examples.

Describe the reactions of -COOH group present in carboxylic acids.

Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?

1. w/w (mass percentage)
2. V/V (volume percentage)
3. w/V (mass by volume percentage)
4. ppm. (parts per million)
5. x (mole fraction)
6. M (Molarity)
7. m (Molality)

The rate constant for the decomposition of N₂O₅ at various temperatures is given below:

T/°C	0	20	40	60	80
105 × k/s-1	0.0787	1.70	25.7	178	2140

Draw a graph between ln k and 1/T and calculate the values of A and E_a. Predict the rate constant at 30° and 50°C.

Explain the various uses of lanthanoids.

Describe the structure of a fuel cell. Draw labelled diagram of a structure of fuel cell?

Explain the structure of different disaccharides.

The activation energy of a reaction is 75.2kJ mol^-1 in the absence of a catalyst and it lowers to 50.14kJ mol^-1with a catalyst. How many times will the rate of reaction grow in the presence of a catalyst if the reaction proceeds at 25°C?

Explain the oxidation of primary, secondary and tertiary alcohols.