Define activation energy of a reaction.

What is meant by ‘reverse osmosis’?

What type of ores can be concentrated by magnetic separation method?

What is meant by ‘lanthanoid contraction’?

Calculate the packing efficiency of a metal crystal for a simple cubic lattice.

Explain how you can determine the atomic mass of an unknown metal if you know its mass density and the dimensions of a unit cell of its crystal.

Differentiate between molarity and molality values for a solution. What is the effect of change in temperature on molarity and molality values?

8.

The thermal decomposition of HCO₂H is a first-order reaction with a rate constant of 2.4 x 10^-3 s^-1 at a certain temperature. Calculate how long will it take for three-fourths of the initial quantity of HCO₂H to decompose.

(log 0.25 = - 0.6021)

What do you understand by the rate law and rate constant of a reaction?

Identify the order of a reaction if the units of its rate constant are:

(i) L^-1 mol s^-1

Describe the principle controlling each of the following processes:

(i) Preparation of cast iron form pig iron.