Q13 of 22 Page 1

(i) Which one of the following is a polysaccharide : starch, maltose, fructose, glucose

(ii) Write one difference between -helix and -pleated sheet structures of protein.


(iii) Write the name of the disease caused by the deficiency of vitamin B12.


(i) Polysaccharides are carbohydrates which yield a large number of monosaccharide units on hydrolysis. Starch is a polysaccharide, maltose is oligosaccharide and fructose, glucose are monosaccharide.


(ii) One difference between -helix and -pleated sheet structures of protein is that in β-structure all peptide chains are held together by intermolecular hydrogen bonds and in -helix peptide chains are held together by intramolecular hydrogen bonds.


(iii) Anemia is the disease caused by the deficiency of vitamin B12.


More from this chapter

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11

A solution is prepared by dissolving 10 g of non-volatile solute in 200 g of water. It has a vapour pressure of 31.84 mm Hg at 308 K. Calculate the molar mass of the solute. (Vapour pressure of pure water at 308 K = 32 mm Hg)

 12

(i) Name the method of refining to obtain silicon of high purity. (ii) What is the role of SiO2 in the extraction of copper?

(iii) What is the role of depressants in froth floatation process?


 14

(i) What type of isomerism is shown by the complex [Cr(H2O)6]Cl3 ?

(ii) On the basis of crystal field theory, write the electronic configuration for d4 ion if o > P.


(iii) Write the hybridization and shape of [CoF6]3-. (Atomic number of Co = 27)


 16

Examine the given defective crystal:

X+ Y- X+ Y- X+


Y- O Y- X+ Y-


X+ Y- X+ O X+


Y- X+ Y- X+ Y-


Answer the following questions:


(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?