Q11 of 27 Page 1

Draw the molecular structures of the following:

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


(b) Dibasic oxoacid of phosphorus

(a)


Explanation: XeO3or Xenon trioxide is isostructural with BrO3 - .


Both have a pyramidal orbital configuration. There is one Xe atom at the apex. It also has a lone pair and three oxygen atoms at the corners of a trigonal base. Bond angle is 109. 5


(b)


Explanation: H3PO3 or orthophosphorous acid is a dibasic oxoacid of phosphorous. As we can see it has two P - OH bonds. Which makes it dibasic. The number of P - OH bonds can give the basicity of the acid. The phosphorous is tetrahedrally surrounded by the H and O atoms


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9

Write the mechanism of acid dehydration of ethanol to yield ethane

 10

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?


 12

(i) By the standard electrode potential values stated for acid solutions, predict whether Ti4 + species may be used to oxidize Fe(II) to Fe(III)


(ii) Based on the data arrange Fe2 + , Mn2 + and Cr2 + in the increasing order of stability of +2 oxidation state. (Give a brief reason)


E°(Cr3 + /Cr2 + ) = - 0. 4V


E°(Mn3 + /Mn2 + ) = + 1. 5V


E°(Fe3 + /Fe2 + ) = + 0. 8V

13

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