Q23 of 26 Page 1

Seeing the growing cases of diabetes and depression among children, Mr. Chopra, the principal of one reputed school organized a seminar in which he invited parents and principals. They all resolved this issue by strictly banning the junk food in schools and by introducing healthy snacks and drinks like soup, lassi, milk, etc. in school canteens. They also decided to make compulsory half an hour physical activity for the students in the morning assembly daily. After six month, Mr. Chopra conducted the health survey in most of the schools and discovered a tremendous improvement in the health of students.

After reading the above passage, answer the following questions;


(i) What are the values (at least two) displayed by Mr. Chopra?


(ii) As a student, how can you spread awareness about this issue?


(iii) Why should antidepressant drugs not be taken without consulting a doctor?


(iv) Give two examples of artificial sweetners.


(i) Mr. Chorpa is an aware citizen. He is concerned of the health of the future generation and so he takes a stand not only to conduct seminar but he also plans and implements to check their health.


(ii) as a student we can spread awareness to our family friends and neighbourhood.


(iii) Intake of antidepressant drugs without consulting a doctor can have side effects which are dangerous. Therefore it is always recommended to consult a doctor before taking any drug.


(iv) Some of the artificial sweetners are o-sulphobenzimide (saccharin) , aspartame, sucralose and alitame.


More from this chapter

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21

Predict the products of the following reactions:

(i)


(ii)


(iii)


22

An element X (molar mass = 60 g mol-1) has a density of 6.23 g cm-3. Identify the type of cubic unit cell, if the edge length of the unit cell is 4× 10-8 cm.

 24

(a) Define the following terms:

(i) Activation energy


(ii) Rate constant


(b) A first order reaction takes 10 minutes for 25% decomposition. Calculate t1/2 for the reaction.


(Given: log2 = 0.3010, log3 = 0.4771, log4 = 0.6021)


OR


(a) For a chemical reaction R → P, the variation in the concentration, ln[R] vs. time(s) plot is given as



(i) Predict the order of the reaction.


(ii) What is the slope of the curve?


(iii) Write the unit of rate constant for this reaction.


(b) Show that the time required for 99% completion is double of the time required for the completion of 90% reaction.


 25

(a) Account for the following:

(i) Bond angle in N is higher than NH3.


(ii) H2S has lower boiing point than H2O.


(iii) Reducing character decreases from SO2 to TeO2.


(b) Draw the structures of the following:


(i) H4P2O7 (Pyrophosphoric acid)


(ii) XeF2


OR


(a) Draw the structures for the following:


(i) XeF4


(ii) H2S2O7


(b) Account for the following:


(i) Iron on reaction with HCl forms FeCl2 and not FeCl3.


(ii) HClO4 is a stronger acid than HClO.


(iii) BiH3 is the strongest reducing agent amongst all the hydrides of group 15.