Define modern periodic law.

Define electro negativity.

How would you explain the fact that the second ionisation potential is always higher than first ionisation potential?

Give the general electronic configuration of lanthanides and actinides.

How does atomic and ionic radii vary across the group and period.

Explain the cause for the variation of atomic radius along a period.

Explain the term valence or oxidation state. How does it vary in a period and in group?

Explain why noble gases are inert?

How is ionisation energy related to the metallic character? How does the basic nature of hydroxides of alkaline earth metals very down the group?

Account for the difference in size of Na +(95 pm) and Mg⁺²(65pm) both of which have the same noble gas configuration

The first ionisation energy (lE₁) and second ionisation energy (lE₂) of elements X, Y and Z are given below.

Element	IE1(kJ mol-1)	IE2(kJ mol-1)
X	2370	5250
Y	522	7298
Z	1680	3381

Which one of the above elements is the most reactive metal, the least reactive metal and a noble gas?

State the Newland's law of octaves.

Define ionic radius.

Define ionisation energy. Give its unit

Ionization energy of beryllium is greater than the ionization energy of boron Why?

Explain why hydrogen is not placed with the halogen in the periodic table.

An the cube at 0° C is placed in some liquid water at 0⁰C, the ice cube sinks - Why? What will happen to ice at 0⁰C placed in liquid water at 0⁰C? 

An the cube at 0°C is placed in some liquid water at 0⁰C, the ice cube sinks - Why? An ice cube at 0°C is placed in some liquid water at 0°C, the ice cube sinks. What is the nature of water? Justify.

Discuss the three types of Covalent hydrides.

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

Give two uses of Tritium.

Explain the reaction of water with halogens.

How is heavy hydrogen D₂ produced.

How is Tritium prepared?

Draw and define ortho and para hydrogen molecule.

How alkali metals react with water? Give an equation?

Why H₂O₂ is used as mild antiseptic?

Explain about the type of bonding present in hydrogen fluoride?

Write a note about gas hydrates.

Write the chemical reactions to show the amphoteric nature of water.