Q23 of 26 Page 1

Sheela, domestic helper of Mrs. Vimla, fainted while sweeping the floor. Mrs. Vimla immediately took her to the nearby hospital where she was diagnosed to be severely anaemic. The doctor prescribed an iron rich diet and multi vitamins supplement to her. Mrs. Vimla supported her financially to get the medicines. After a month, Sheela was diagnosed to be normal.

After reading the above passage, answer the following questions.


(i) Name the vitamin whose deficiency causes pernicious anaemia.


(ii) What are vitamins and how are they classified?


(iii) What values (any two) are displayed by Mrs. Vimla?


(i) The vitamin whose deficiency causes pernicious anaemia is Vitamin B12.


(ii) Vitamins are organic compounds required in the diet in small amounts to perform specific biological functions for normal maintenance of optimum growth and health of the organism.


Vitamins are classified into two groups depending upon their solubility in water or fat.


1. Fat soluble vitamins: Vitamins which are soluble in fat and oils but insoluble in water are kept in this group. These are vitamins A, D, E and K. They are stored in liver and adipose (fat storing) tissues.


2. Water soluble vitamins: B group vitamins and vitamin C are soluble in water so they are grouped together. Water soluble vitamins must be supplied regularly in diet because they are readily excreted in urine and cannot be stored (except vitamin B12) in our body.


(iii) Values displayed by Mrs. Vimla are helpful and compassionate. As she took her to the hospital and also financially supported her for her treatment.


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21

(a) Identify the monomers in the following polymeric structure:


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Define the following terms:

(i) Antacids (ii) Antiseptic (iii) Tranquillizers


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(a) Examine the given defective crystal:


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(i) Is the above defect stoichiometric or non-stoichiometric?


(ii) Write the term used for this type of defect. Give an example of the compound which shows this type of defect.


(iii) How does this defect affect the density of the crystal?


(b) Write two differences between amorphous solids and crystalline solids.


OR


(a) In terms of band theory, how are conductors different from semi conductors and insulators? Give one example of each.


(b) Why does the electrical conductivity of semi conductors increase with rise in temperature?


(c) What is the formula of a compound in which the element Y form hcp lattice and atom X occupies 1/3rd of octahedral voids?


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A translucent white waxy solid (A) on heating in an inert atmosphere is converted to its allotropic form (B). Allotrope (A) on reaction with aqueous KOH liberates highly poisonous gas (C) having rotten fish smell. With excess of chlorine forms (D), which on hydrolysis forms the compound (E). Identify the compounds A to E.

OR


Give reasons:


(i) H2S has a lower boiling point than H2O.


(ii) Reducing character decreases from SO2 to TeO2.


(iii) H2Te is the strongest reducing agent amongst all the hydrides of group 16 elements.


(iv) BiH3 is stronger reducing agent than SbH3.


(v) HF is not stored in glass bottles but is kept in wax coated glass bottles.