Q23 of 26 Page 1

Sanjay, a peon working in Mr. Pamil’s office, fainted while standing outside his room. Mr. Pamil took him to the nearby hospital where he was diagnosed to be severely 'anaemic’. The doctor prescribed an iron rich diet and multivitamin supplement to him. Mr. Pamil supported his family to get the medicines. After 20 — 25 days he was diagnosed to be normal.

Answer the following questions:


(a) What values (two) are displayed by Mr. Pamil ?


(b) Name the vitamin whose deficiency causes ‘Pernicious


Anaemia'.


(c) Give an example of a water soluble vitamin.


(d) Name two sources of vitamins needed to treat Pernicious Anaemia.


(a) Mr Pamil shows the kind behavior as he took he peon to nearby hospital immediately. Also he displays his helping and concerned nature by helping him financially.


(b) Pernicious anaemia is caused due to the deficiency of Vitamin B12.


(c) Vitamin B12, vitamin C, vitamin B1 are some examples of water soluble vitamins.


(d) Vitamin B12 is mainly founs in animal products such as milk an its products, eggs, fish, meat etc.


More from this chapter

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21

(a) Identify the monomer units of


(b) On the basis of forces between their molecules in a polymer, which class do polyvinyls belong to ?


(c) Write the monomers of Terylene.


 22

(a) Why is it safer to use soaps from the environmental point of view?


(b) What is the basic difference between antiseptics and disinfectants?


(c) Pickles have a long shelf life and do not get spoiled for months. Why?


 24

(a) A solution is prepared by dissolving 5.0 g of a non-volatile solute in 95 g of water. It has a vapour pressure of 23.375 mmHg at 25°C. Calculate the molar mass of the solute. Vapour pressure of pure water at 25°C is 23.75 mmHg.

(b) Give reasons for the following :


(i) Osmotic pressure is considered to be a colligative property.


(ii) Molality is a better option to express concentration in comparison to molarity.


OR


(a) Calculate the amount of CaCl2 (molar mass = 111 g/mol) which must be added to 500 g of water to lower its freezing point by 2K, assuming CaCl2 is completely dissociated.


(Kf For water = 1.86 K kg /mol )


(b)


(i) What happens when blood cells are placed in distilled water?


(ii) Why is increase in temperature observed on mixing chloroform with acetone?


 25

Account for the following:

(a) Chlorine water on standing loses its yellow colour.


(b) F2 has lower bond dissociation enthalpy than Cl2.


(c) BiH3 is the strongest reducing agent amongst all the


hydrides of group 15.


(d) Noble gases have low boiling points.


(e) On addition of ozone to KI solution, violet vapours are Obtained.


OR


(a) Give balanced chemical equations for the following reactions :


(i) XeF2 + H2O →


(ii) XeF6 + NaF →


(iii) XeF4 + SbF5 →


(b) Draw the structures of the following :


(i) H4P2O7


(ii) XeF4