Q14 of 30 Page 1

What happens when

(i) PCl5 is heated?


(ii) H3PO3 is heated?


Write the reactions involved.


(i) When PCl3 is strongly heated, it decomposes to form PCl3 and Cl2.



(ii) H3PO3 on heating undergoes disproportionation reaction to form phosphine (PH3) and orthophosphoric acid (H3PO4). Since the oxidation number of P in reactants and products is not same anywhere, the reaction is termed as disproportionate reaction.



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12

Write the differences between physisorption and chemisorption with respect to the following:

(i) Specificity


(ii) Temperature dependence


(iii) Reversibility and


(iv) Enthalpy change


 13

(a) Which solution is used for the leaching of silver metal in the presence of air in the metallurgy of silver?

(b) Out of C and CO, which is a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore?


 15

(a) Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?

(b) Which of the following cations are coloured in aqueous solutions and why?


Sc3+, V3+, Ti4+,Mn2+


(At. nos. Sc= 21, V = 23, Ti = 22, Mn= 25)


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Chlorobenzene is extremely less reactive towards a nucleophilic substitution reaction. Give two reasons for the same.