Q2 of 36 Page 1

What type of Stoichiometric defect is shown by ZnS and why?

Frenkel defect is shown by ZnS because there is a large difference in between the size of Zn2+ and S2- ion. Frenkel defect is a type of point defect. Here, Zn2+ ion which is very small in size compare to S2- ion.


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18

Give reasons for the following:

(i) Transition metals form alloys.


(ii) Mn2O3 is basic, whereas Mn2O7 is acidic.


(iii) Eu2+ is a strong reducing agent.


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(i) Why bithional is added in soap ?

(ii) Why magnesium hydroxide is a better antacid than sodium bicarbonate ?


(iii) Why soaps are biodegradable whereas detergents are non-biodegradable ?


OR


Define the following terms with a suitable example in each :


(i) Antibiotics


(ii) Artificial sweeteners


(iii) Analgesics


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Write one stereochemical difference between SN1 and SN2?

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State Henry’s Law and write its two application?