(i) By the standard electrode potential values stated for acid solutions, predict whether Ti^{4 +} species may be used to oxidize Fe(II) to Fe(III)

(ii) Based on the data arrange Fe^{2 +} , Mn^{2 +} and Cr^{2 +} in the increasing order of stability of +2 oxidation state. (Give a brief reason)

E°(Cr^{3 +} /Cr^{2 +} ) = - 0. 4V

E°(Mn^{3 +} /Mn^{2 +} ) = + 1. 5V

E°(Fe^{3 +} /Fe^{2 +} ) = + 0. 8V

For a certain chemical reaction variation in concentration [A] vs. time (s) plot is given below:

(i) Predict the order of the given reaction?

(ii) What does the slope of the line and intercept indicate?

(iii) What is the unit of rate constant k?

Draw the molecular structures of the following:

(a) Noble gas species which is isostructural with BrO₃ ^-

(b) Dibasic oxoacid of phosphorus

Niobium crystallizes in a body - centered cubic structure. If the atomic radius is 143. 1 pm, calculate the density of Niobium. (Atomic mass = 93u).

Give reasons for the following:

a. When 2g of benzoic acid is dissolved in 25 g of benzene, the experimentally determined molar mass is always greater than the true value.

b. A mixture of ethanol and acetone shows positive deviation from Raoult’s Law.

c. The preservation of fruits by adding a concentrated sugar solution protects against bacterial action.