Give the limitations of Ellingham diagram.

Explain refining of titanium by Van-Arkel method.

Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

Give a detailed account on allotropes of sulphur.

Explain the bleaching action of Chlorine.

Describe the variable oxidation state of 3d series elements.

Why is there a variation of atomic andionic size as we move from Sc to Zn?

On the basis of VB theory explain the nature of bonding in [Co(C₂O₄)₃]^3-

What are the salient feature of crystal field theory?

Sodium metal crystallizes in bcc structure with the edge length of the unit cell 4.3 x 10^-8 cm. Calculate the radius of sodium atom.

How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.

The activation energy of a reaction is 22.5 k Cal mol^-1 and the value of rate constant at 40°C is 1.8 x 10^-5s^-1. Calculate the frequency factor, A.

The conversion of molecules x to y follows second order kinetics. Its concentration of x is increased to three times how will it affect the rate of formation of y?
For the reaction x ➝ y as it follows second order kinetics wherefore the rate of formation of y?

Will a precipitate be formed when 0.150 L of 0.1M Pb(NO₃)₂ and 0.100L of 0.2 M NaCl are mixed? \(K_{sp}\ (PbCl_{2})=1.2\times10^{-5}\).

Calculate the pH of 0.1 M acetic acid if its ionisation constant Ka = 1.8 x 10^-5.

9.2\(\times\)10¹² litres of water is available in a lake. A power reactor using the electrolysis of water in the lake, produces electricity at the rate of 2\(\times\)10⁶ Cs⁻¹ at an appropriate voltage. How many years would it take to completely electrolyse the water in the lake. Assume that there is no loss of water except due to electrolysis.

To one molar solution of a trivalent metal salt, electrolysis was carried out and 0.667 M was the concentration remaining after electrolysis. Calculate the quantity of electricity passed.

Write a note on catalytic poison

Give the special characteristics of enzyme catalysed reactions.

Phenol is distilled with Zn dust followed by friedel – crafts alkylation with prophyl chloride to give a compound B, B on oxidation gives (c) Indentify A,B and C.

An aromatic hydrocarbon A reacts with propene in the presence of anhydrous AlCl₃ to give a compound B with a molecular formula C₉H₁₂ Further compound B undergoes oxidation in the, presence of air to give hydrogen peroxide C. Compound C decomposes in HCI acid solution to give compound D and acetone. Identify A, B, C and D. Explain the reactions.

Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.

Discuss the mechanism of aldol condensation.

A dibromo derivative (A) on treatment with KCN followed by acid hydrolysis and heating gives a monobasic acid (B) along with liberation of CO₂ . (B) on heating with liquid ammonia followed by treating with Br₂ /KOH gives (c) which on treating with NaNO₂ and HCl at low temperature followed by oxidation gives a monobasic acid (D) having molecular mass 74. Identify A to D.

How is terylene prepared?