Q8 of 26 Page 1

(a) Write the formula of two oxoacids of phosphorus.

(b)Name the molecular geometry of BrF �5 .


(a) Oxoacids are those acids which contains oxygen. Phosphorus forms many oxoacids, such as hypophosphoric acid(H3PO4), orthophosphoric acid(H3PO5),hypophosphorus acid (H3PO2),phosphorous acid(H3PO3) etc.


(b) Bromine being a part of group 17 contains 7 electrons in its outermost shell. In BrF5, the five electron is bounded with F, and remaining 2 are present as 1 lone pair. So the molecule geometry of BrF5 will be square pyramidal.


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6

Account for the following:

(a) Rusting of iron is quicker in saline water than in ordinary water.


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OR


Define fuel cell. Write the electrode reaction in H2 — O2 fuel cell.


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(a) For the reaction 2X→ X2 the rate of reaction becomes three times when concentration of [X] is increased 27 times. What is the order of the reaction?

(b) What will be the effect of temperature on the rate of reaction?


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Account for the following:

a) MnO is basic whereas Mn2O7 isacidic.


b) Actinoid contraction is greater than lanthanoid contraction.


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How are the following conversions carried out?

(a) Phenol to Acetophenone


(b) Ethanal to Propan-2-ol