What is bond energy? How it is calculated? Discuss the various factors that affect bond energy.

What is meant by heat of formation ?

State Hess's law of constant heat summation by taking suitable examples.

Give reason for the following :

Entropy of a system increases with increase in temperature.

Give reason for the following:

$∆\mathrm{G}$ is always $-\mathrm{ve}$ for a spontaneous reaction.

Give reason for the following :

Enthalpy of neutralisation of a weak acid with a strong base is less than that of a strong acid with strong base. 

Give reason for the following :

In exothermic reaction $∆\mathrm{H}$ is $-\mathrm{ve}$

Give reason for the following :

$∆\mathrm{G}$ is zero at equilibrium.

What do you understand by Heat of solution