What do you understand by the term mole ?

How many orbitals are possible for n = 4?

Is the definition given below for ionisation enthalpy correct?
"Ionisation enthalpy is defined as the energy required to remove the most loosely bound electron from the valence shell of an atom.

Predict which of the following hydrides is a gas on a solid
(a) BCI
(b) NaH 
Give your reason.

Substantiate lithium fluoride has the lowest solubility among group one metal fluorides.

Give the mathematical expression that relates gas volume and moles.

Define Hess's law of constant heat summation.

If there is no change in concentration, why is the equilibrium state considered dynamic?

What is a pi bond ?

Describe the classification of organic compounds based on their structure.

What are electrophiles and nucleophiles ? Give suitable examples for each.

Describe the mechanism of Nitration of benzene.

Which alkyl halide from the following pair is
i) chiral
ii) undergoes faster S_N2 reaction?

What are degradable and nondegradable pollutants ?