Q23 of 26 Page 1

John had gone with his mother to the doctor as he was down with fever. He then went to the chemist shop with his mother to purchase medicines prescribed by the doctor. There he observed a young man pleading with the chemist to give him medicines as he had nasal congestion. The chemist gave him cimetidine. John advised and also explained to the young man that he should only take the medicines prescribed by the doctor.

Answer the following questions:


(a) Did the chemist give an appropriate medicine? Justify your answer.


(b) John’s action was appreciated by his mother. List any two reasons.


(a)


No, the chemist did not give an appropriate medicine . because cimetidine(Tegamet) is actually anantacid which was designed to prevent the interaction of histamine(which stimulates the secretion of pepsin and hydrochloric acid in the stomach) with the receptors present in the stomach wall. This resulted in release of lesser amount of acid therefore cures hyperacidity.


(b)


John’s action was appreciated by his mother because :


• Clearly the man was having some kind of allergic reaction or common cold which resulting in nasal congestion and hence antihistamine drugs are likely to work on him rather than antacid like cimetidine.


• Another reason for appreciating John’s action is that he John not only explained to the young man also advised him to take only the medicines prescribed by the doctor as the real reason behind his nasal congestion can only be diagnosed by a doctor and the right and suitable antihistamine should be given to him for treatment.


More from this chapter

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21

(i) Identify the monomer in the following polymeric structure: [ CH2-CH=CH-CH2-CH2-CHCN]n


(ii) On the basis of forces between their molecules in a polymer to which class does neoprene belong?


(iii) Can both addition and condensation polymerization result in the formation of a copolymer?


22

(i) Which of the following biomolecule is insoluble in water? Justify.


Insulin, Haemoglobin, Keratin.


(ii) Draw the Haworth structure for α-D-Glucopyranose.


(iii) Write chemical reaction to show that glucose contains aldehyde as carbonyl group.


24

(a) Write the mechanism of hydration of ethene to form ethanol.

(b) How are the following conversions carried out?


(i) Propanol to propan-2-ol.


(ii) Propanol to 1-propoxypropane


(c) Give the structure and the IUPAC name of the major product obtained in the following reaction:



OR


(a)Write the mechanism of the reaction of HI with methoxymethane.


b) Identify A and B in the following reactions:


(i)



(ii)



(c) Give the structure and the IUPAC name of the major product obtained in the following reaction:



conc. H2SO4


25

(a) A blackish brown coloured solid (A) which is an oxide of manganese, when fused with alkali metal hydroxide and an oxidizing agent like KNO3, produces a dark green coloured compound (B). Compound (B) on disproportionation in neutral and acidic solution gives a purple coloured compound (C). Identify A, B and C and write the reaction involved when compound (C) is heated to 513 K.

(b)


(i) E0 M3+ / M2+values for the first series of transition elements are given below.


Answer the question that follows:



Identify the two strongest oxidizing agents in the aqueous solution from the above data.


ii) Copper (I) ion is not known in aqueous solution


iii) The highest oxidation state of a metal is exhibited in its oxide.


OR


(a) Write balanced equations to represent what happens when


(i)Cu2+ is treated with KI.


(ii) Acidified potassium dichromate solution is reacted with iron (II) solution.


(ionic equation)


(b)


i) The figure given below illustrates the first ionization enthalpies of first, second and third series of transition elements. Answer the question that follows



Which series amongst the first, second and third series of transition elements have


the highest first ionization enthalpy and why?


ii) Separation of lanthanide elements is difficult. Explain.


iii) Sm2+, Eu2+ and Yb2+ ions in solutions are good reducing agents but an


aqueous solution of Ce4+ is a good oxidizing agent. Why?