Q13 of 26 Page 1

(i) Which one of the following is a monosaccharide:

Starch, maltose, fructose, cellulose


(ii) What is the difference between acidic amino acids and basic amino acids?


(iii) Write the name of the vitamin whose deficiency causes bleeding of gums.


(i) Fructose is a monosaccharide because it cannot be further split into simpler units. Maltose is a disaccharide. Starch and cellulose are polysaccharides.


(ii)Amino acids contain an amine group and carboxylic group. When the number of amine groups are higher the amino acid is called as basic amino acid. When the number of carboxylic acid group present in the amino acid is higher then the amino acid is called as acidic amino acid.


(iii) Vitamin C deficiency causes bleeding in gums.


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11

Calculate the mass of Nacl (molar mass = 58.5 g mol-1) to be dissolved in 37.2g of water to lower the freezing point by 20C, assuming that NaCl undergoes complete dissociation. (Kf for water = 1.86 K kg mol-1).

 12

Write the names and structures of the monomers of the following polymers:

(i) Terylene


(ii) Bakelite


(iii) Buna-S


 14

(i) Indicate the principle behind the method used for the refining of Nickel.

(ii) What is then role of dilute NaCN in extraction of Gold?


(iii) What is ‘copper matte’?


 15

Calculate the emf of the following cell at 250C:

Zn|Zn2+(0.001 M) || H+(0.01 M) | H2(g)(1 bar) | Pt(s)


2E0(zn2+/Zn) = -0.76 V, E0(H+/H ) = 0.00 V