Explain the periodic trend of ionisation potential.

Explain the diagonal relationship.

By using paulings method calculate the ionic radii of K⁺ and CI^- ions in the potassium chloride crystal. Given that dk⁺-cl^-=3.14 Å. 

Explain the following, give appropriate reasons.
(i) Ionisation potential of N is greater than that of O.
(ii) First ionisation potential of C-atom is greater than that of B atom, where as the reverse is true is for second ionisation potential.
(iii) The electron affinity values of Be, Mg and noble gases are zero and those of N (0.02 eV) and P (0.80 eV) are very low.
(iv) The formation of F-(g) from F(g) is exothermic while that of O^2-(g) from O (g) is endothermic.

Calculate the effective nuclear charge experienced by the 4s electron in potassium atom.

Calculate the effective nuclear charge of the last electron in an atom whose configuration is 1s² 2s² 2p⁶ 3s² 3p⁵ 

Using Slater's rule calculate the effective nuclear charge on a 3p electron in aluminium and chlorine. Explain how these results relate to the atomic radius of the two atoms.

Explain about the anomalies of Mendeleev's periodic table.

(a) Define ionization energy.
(b) Prove that ionization energy is a periodic property.

Justify the position of hydrogen in the periodic table?

An isotope of hydrogen (A) reacts with diatomic molecule of element which occupies group number 16 and period number 2 to give compound (B) is used as a moderator in nuclear reaction. (A) adds on to a compound ( C), which has the molecular formula C₃H₆ to give (D). Identify A, B, C and D.

Illustrate the industrial applications of hydrogen depending on 
(i) The heat liberated when its atoms are made to combine on the surface of metal.
(ii) Its effect on unsaturated organic system.
(iii) Its ability to combine with nitrogen under specific conditions.

How does heavy water react with the following compounds ?
(i) Al₄C₃
(ii) CaC₂
(ill) Mg₃N₂ and
(iv) Ca₃P₂

Define hydrogen bond and its types.

Identify the compound (A) which is a universal solvent. Compound A reacts with chlorine gas to give B and C. Compound A dissolves in an ionic compound of silicon to give compound D. Identify A and write the equations involved in the formation of B, C, and D.

Compound A is an important peroxide which disproportionates to give oxygen and water. Compound A reacts with ferrous sulphate under the acidic condition to give compound B. Compound A reacts with KMnO₄ in basic condition to form (C) and (D) along with water and CO₂ What are A, B, C and D ? Write down the equations involved in their formation.

An element (A) which is used in metallurgy for the reduction of metal oxide to metal reacts with carbon monoxide and forms an industrial solvent (B). The industrially produced element (A) reacts with nitrogen to form compound (C). Identify A, B, and C.

Dihydrogen reacts with dioxygen (O₂) to form water. Write the name and formula of the product when the isotope of hydrogen which has one proton and one neutron in its nucleus is treated with oxygen. Will the reactivity of both the isotopes be the same towards oxygen? Justify your answer.

How does water react with
(i) SiCI₄
(ii) P₄O₁₀

How is hydrogen peroxide is used to restore the white colour of old paintings.