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MODEL PAPER 4 — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 45 Marks
Question
Attempt any five of the following:
(a) Define native state in reference to proteins.
(b) Define the following terms:
    a. Polysaccharides
    b. Nucleotides
(c) Deficiency of which vitamin causes scurvy?
(d) What happens when D-glucose is treated with the following? Give equations to support your answer.
    a. HI
    b. HNO3
(e) Name the disaccharide which on hydrolysis gives glucose and galactose.
(f) Write the products obtained after hydrolysis of lactose.
(g) Give the reaction of glucose with hydrogen cyanide. Presence of which group is confirmed by this reaction?
✓

Answer

Attempt any five of the following:
(i) Native state of protein is the sequence in which the amino acids are linked together with the help of peptide bond.
(ii) a. Polysaccharides contain a large number of monosaccharide units joined together by glycosidic linkages.
b. Sugar + Phosphate + base / Nucleoside linked to a phosphate group.
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