Q. 24

A. Account for th

Answer :

A.(i) H2Te has less bond dissociation enthalpy than H2S . So, less energy is required to break H2Te bond & releasing [H]+ is easier & hence the acidity of H2Te is higher. Whereas, H2S has High Bond Dissociation Energy & hence the acidity of H2S is less.


(ii) PCl5 is a non-polar covalent molecule because individual dipole moments of P-Cl bond cancel out each other but PCl3 is a polar covalent molecule. Therefore, PCl5 is more covalent than PCl3


B. (i)


(ii)


OR


(i) Acid strength can be explained by the oxidation number of the central atom. The central atom here is Phosphorous (P).


H3PO4: +5


H3PO3: +3


H3PO2: +1


Hence, the order of reducing character is H3PO4>H3PO3>H3PO2


(ii) Xenon have 8 electrons in its Valence shell Due to large size of Xenon the force of attraction between the Valence shell and nucleous decreases and it forms compound like XeF6, XeOF4 etc where as He is very small in size and have more force of attraction between Valence shell and nucleous hence He cannot form compounds in ordinary conditions (at room temperature).


(iii) In accordance to Le Chatelier's principle ,low temperature will shift the equilibrium to the right because the reaction is exothermic. This gives greater yield of ammonia. Therefore a temperature of about 450°C will be optimal for the preparation of ammonia.


(iv) Chlorine is commonly used as an antiseptic and is used to make drinking water safe and to treat swimming pools. Large amounts of chlorine are used in many industrial processes, such as in the production of paper products, plastics, dyes, textiles, medicines, antiseptics, insecticides, solvents and paints.


(v) SO2 is a colorless and pungent smell gas. It can be detected by using potassium permanganate solution. When SO2 is passed through an acidified potassium permanganate solution, then it decolonises the solution as it reduces MnO4- ions to Mn2+ ions. SO2 give out suffocating smell which indicates its presence.


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