Q23 of 26 Page 1

Due to hectic and busy schedule, Mr. Awasthi made his life full of tensions and anxiety. He started taking sleeping pills to overcome the depression without consulting the doctor. Mr. Roy, a close friend of Mr. Awasthi, advised him to stop taking sleeping pills and suggested to change his lifestyle by doing Yoga, meditation and some physical exercise. Mr. Awasthi followed his friend’s advice and after few days he started feeling better.

After reading the above passage, answer the following:


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


(ii) Why it is not advisable to take sleeping pills without consulting doctor?


(iii) What are tranquilizers? Give two examples.


(i) The 2 values displayed by Mr. Roy are-


Caring- he was concerned for his friend’s health.


Knowledgeable- he suggested him different healthy measure instead of taking sleeping pills.


(ii) It is not advisable to take sleeping pills without consulting doctor because of their various harmful side effects.


(iii) Tranquilizers are neurologically active drugs. These affect the message transfer mechanism from nerve to receptor. Tranquilizers are a class of chemical compounds used for the treatment of stress, and mild or even severe mental diseases. These relieve anxiety, stress, irritability or excitement by inducing a sense of well-being.


Examples are chlordiazepoxide and meprobamate.


More from this chapter

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21

Write the role of

(i) I2 in the van Arkel method of refining.


(ii) Cryolite in the extraction of aluminium.


(iii) Dilute NaCN in the extraction of silver.


 22

Write the major product(s) in the following reactions:


 24

(a) Calculate ∆G° and log Kc for the following reaction at 298 K:

2Cr(s) + 3Fe2+(aq) → 2Cr3+(aq) + 3Fe(s)


Given: E°cell = 0.30 V


(b) Using the E° values of A and B, predict which is better for coating the surface of iron [E° (Fe2+|Fe) = –0.44 V] to prevent corrosion and why?


Given: E°(A2+|A) = –2.37 V : E°(B2+|B) = –0.14 V


OR


(a) The conductivity of 0.001 mol/L solution of CH3COOH is 3.905 × 10-5 S/cm. Calculate its molar conductivity and degree of dissociation.


Given: λ° (H+) = 349.6 S cm2 mol-1 and λ° (CH3COO-) = 40.9 S cm2 mol-1.


(b) What type of battery is lead storage battery? Write the overall reaction occurring in lead storage battery.


 25

(a) Account for the following:

(i) Mn2O7 is acidic whereas MnO is basic.


(ii) Though copper has completely filled d-orbital (d10) yet it is considered as a transition metal.


(iii) Actinoids show wide range of oxidation states.


(b) Write the preparation of potassium permanganate from pyrolusite ore (MnO2).


OR


(a) The elements of 3d transition series are given as:



Answer the following:


(i) Which element has the highest m.p. and why?


(ii) Which element is a strong oxidizing agent in +3 oxidation state and why?


(iii) Which element is soft and why?


(b) Write the equations involved in the preparation of Potassium dichromate from Sodium chromate (Na2CrO4).