Download App

MODEL PAPER 6 — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 65 Marks
Question
(a) Differentiate between
a. Nucleotide and Nucleoside
b. Amylose and Amylopectin
(b) Write a reaction which shows that all the carbon atoms in glucose are linked in a straight chain.
(c) Write two differences between DNA and RNA.
(d) Amino acids can be classified as $\alpha-, \beta-, \gamma-, \delta-$ and so on depending upon the relative position of the amino group with respect to the carboxyl group. Which type of amino acids forms a polypeptide chain in proteins?
(e) What are any two good sources of vitamin A?
(f) What is anomeric carbon?
(g) What is the difference between a glycosidic linkage and a peptide linkage?
✓

Answer

Attempt any five of the following:
(i)
a. Nitrogeneous base linked with pentose sugar called as nucleoside while Nucleoside linked with phosphate group is called as nucleotide.
b. Amylose is water soluble while amylopectin is water insoluble.
(ii) On prolonged heating with HI, glucose gives n-hexane which suggest that all the six carbon atoms in glucose are linked linearly.
HOH_2 $HOH _2 C \underset{\text { Glu cose }}{( CHOH )_4 CHO }+ HI \xrightarrow{\Delta} CH _3\left( CH _2\right)_4 CH _3$
(iii) 
DNARNA
Double strandedSingle stranded
Thymine base is presentUracil base is present

Image
(v) Milk, carrot
(vi)An anomeric carbon can be identified as the carbonyl carbon (of the aldehyde or ketone functional group) in the open- chain form of the sugar. It can also be identified as the carbon bonded to the ring oxygen and a hydroxyl group in the cyclic form.
(vii) Glycosidic linkage: It is the linkage which joins two monosaccharides through oxygen atom. It is present in carbohydrates.
Peptide Linkage: It is the linkage which joins two amino acids through - CO-NH- bond. It is present in proteins.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from MODEL PAPER 6→MODEL PAPER 6 — all question types→Chemistry STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Answer the following questions:Account for the following$:$
  1. Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.
  2. Diazonium salts of aromatic amines are more stable than those of aliphatic amines.
→
Explain the following :
(i) Fermentation
(ii) Dehydration
(iii) Hydrogen bonding in alcohols.
→
Answer the following questions: Is the variability in oxidation number of transition elements different from that of non$-$transition elements? Illustrate with examples.
→
Give the electronic configuration of the following complexes on the basis of Crystal Field Splitting theory. $\ce{[CoF_6]^{3-}, [Fe(CN)_6]^{4-}}$ and $\ce{[Cu(NH_3)_6]^{2+}}$
→
Classify carbohydrates and also give examples of each.
→
Match the solutions given in Column $I$ and the colours given in Column $II.$
 
Column $I ($Aqueous solution of salt$)$
 
Column $II($Colour$)$
$(i)$ $\ce{FeSO_4.7H_2O}$ $(a)$
Green
$(ii)$ $\ce{NiCl_2.4H_2O}$ $(b)$
Light pink
$(iii)$ $\ce{MnCl_2.4H_2O}$ $(c)$
Blue
$(iv)$ $\ce{CoCl_2.6H_2O}$ $(d)$
Pale green
$(v)$ $\ce{Cu_2Cl_2}$ $(e)$
Pink
 
 
 $(f)$
Colourless
→
Draw the structure of $[Co(NH_{3})_{6}]^{3+}$ and $[Ni(CO)_{4}]$. Write the hybridisation of atomic orbital of transition metal in each case.
→
Explain fuel cell in detail and explain the shortcomings of power generation from thermal plants.
→
  1. State Raoult’s law for a solution containing volatile components.
 How does Raoult’s law become a special case of Henry’s law?
  1. $1.00\ g$ of a non-electrolyte solute dissolved in $50\ g$ of benzene lowered the freezing point of benzene by $0.40 K.$ Find the molar mass of the solute. $(K_f$ for benzene $= 5.12 \ kg\ mol^{-1}).$
→
  1. Give three points of difference between lanthanoids and actinoids.
  2. Give reason and select one atom$/$ion which will exhibit asked property:
  1. $Sc^{3+}$ or $Cr^{3+} ($Exhibit diamagnetic behaviour$).$
  2. $Cr$ or $Cu ($High melting and boiling point$).$
→