Q23 of 35 Page 1

Ashwin observed that his friend Shubham was staying aloof, not playing with friends and becoming easily irritable for some weeks. Ashwin told his teacher about this, who, in turn, called Shubham’s parents and advised them to consult a doctor. Doctor after examining Shubham prescribed antidepressant drugs for him.

After reading the above passage, answer the following questions:


(i) Name two antidepressant drugs.


(ii) Mention the values shown by Ashwin.


(iii) How should Shubham’s family help him other than providing medicine?


(iv) What is the scientific explanation for the feeling of depression?

(i) Two antidepressant drugs are iproniazid and phenelzine.


(ii) The values shown by Ashwin are concerned, caring, helpful.


(iii) The should spent more time with Shubham, should do regular talk and play regularly with him or they can also consult a pshychologist.


(iv) Noradrenaline is one of the several neurotransmitters which play an important role in mood changes.


If the level of Noradrenaline in the body is low for some reasons, then the message transfer process becomes slow and the person suffers from depression.


More from this chapter

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22

The magnetic moments of few transition metal ions are given below:























Metal ion



Magnetic moment(BM)



Sc3+



0.00



Cr2+



4.90



Ni2+



2.84



Ti3+



1.73



(at no. Sc = 21, Ti =22, Cr = 24, Ni = 28)


Which of the given metal ions :


(i) has the maximum number of unpaired electrons?


(ii) forms colourless aqueous solution?


(iii) exhibits the most stable +3 oxidation state?

 22

Consider the standard electrode potential values (M2+ / M) of the elements of the first transition series.


Explain:


(i) Eo value for copper is positive.


(ii) Eo value of Mn is more negative as expected from the trend.


(iii) Cr2+ is a stronger reducing agent than Fe2+

 24

Arrange the following in the order of property indicated against each set:

(i) F2, Cl2, Br2, I2 (increasing bond dissociation enthalpy)


(ii) H2O, H2S, H2Se, H2Te (increasing acidic character)


(b) A colourless gas ‘A’ with a pungent odour is highly soluble in water and its aqueous solution is weakly basic. As a weak base it precipitates the hydroxides of many metals from their salt solution. Gas ‘A’ finds application in detection of metal ions. It gives a deep blue colouration with copper ions. Identify the gas ‘A’ and write the chemical equations involved in the following:


(i) Gas ‘A’ with copper ions


(ii) Solution of gas ‘A’ with ZnSO4 solution.

 24

Answer the following questions

(a) Write the formula of the neutral molecule which is isoelectronic with ClO-.


(b) Draw the shape of H2S2O7.


(c) Nitric acid forms an oxide of nitrogen on reaction with P4.Write the formula of the stable molecule formed when this oxide undergoes dimerisation.


(d) Bleaching action of chlorine is permanent. Justify.