The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). Identify A, B and C.

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

Why do zirconium and Hafnium exhibit similar properties?

Why first ionization enthalpy of chromium is lower than that of zinc?

What is crystal field stabilization energy (CFSE)?

Aluminium crystallizes in a cubic close packed structure. Its metallic radius is 125pm. calculate the edge length of unit cell.

The rate constant for a first order reaction is 1.54 x 10^-3 s^-1. Calculate its half life time.

The rate constant of a reaction at 400 and 200K are 0.04 and 0.02 s^-1 respectively. Calculate the value of activation energy.

K_sp of AgCl is \(1.8\times10^{-10}\). Calculate molar solubility in 1 M AgNO₃

Calculate the standard emf of the cell: Cd|Cd²⁺||Cu²⁺|Cu and determine the cell reaction. The standard reduction potentials of Cu²⁺|Cu and Cd²⁺|Cd are 0.34V and -0.40 volts respectively. Predict the feasibility of the cell reaction.

Write a note on sacrificial protection.

Comment on the statement: Colloid is not a substance but it is a state of substance.

An organic compound (A) of molecular formula C₆H₆O gives violet colour with neutral FeCI₃. (A) gives maximum of two isomers (B) and (C) when an alkaline solution of (A) is refluxed with CCI₄ (A) also reacts with C₆H₅N₂CI to give the compound (D) which is red orange dye. Identify (A), (B), (C) and (D). Explain with suitable chemical reactions.

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

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.

Write the structure of α-D (+) glucophyranose

Write a note on co –polymer