Download App

Biomolecules — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryBiomolecules5 Marks
Question
Explain the structure of starch and cellulose.
✓

Answer

self

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 Biomolecules→Biomolecules — all question types→Chemistry STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

What is vapour pressure? When a non- volatile solute is dissolved in any liquid, the vapour pressure of the liquid decreases. Give reason.
→
Give reasons for the following: On electrolysis in acidic solution amino acids migrate towards cathode, while in alkaline solution these migrate towards anode.
→
The rate constant for the first order decomposition of H2O2 is given by the following euqation :
$\log k=14.34-1.25 \times 10^4 K / T$
Calculate $E_{a}$ for this reaction and at what temperature will its half-period be 256 minutes?
→
Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with $(i)$ iron $(II)$ ions $(ii) SO_2$ and $(iii)$ oxalic acid? Write the ionic equations for the reactions.
→
Using crystal field theory, draw energy level diagram, write the electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following:
i. $\left[ CoF _6\right]^{3-},\left[ Co \left( H _2 O \right)_6\right]^{2+},\left[ Co ( CN )_6\right]^{3-}$
ii. $\left[ FeF _6\right]^{3-},\left[ Fe \left( H _2 O \right)_6\right]^{2+},\left[ Fe ( CN )_6\right]^{4-}$
→
A solution containing 30 g of non-volatile solute exactly in 90 g of water has a vapour pressure of 2.8 kPa at 298 K. Further, 18 g of water is then added to the solution and the new vapour pressure becomes 2.9 kPa at 298 K. Calculate :
(i) molar mass of the solute
(ii) vapour pressure of water at 298 K
→
Answer the following question:
Calculate the molality of a sulphuric acid solution in which the mole fraction of water is 0.85.
→
  1. Calculate the freezing point of solution when $1.9 g$ of $\ce{MgCl_2(M = 95 g mol^{–1})}$ was dissolved in $50 g$ of water, assuming $MgCl_2$ undergoes complete ionization. $(K_f$​​​​​​​ for water $= 1.86 K \ kg mol^{–1})$
  2. Out of $1 M$ glucose and $2 M$ glucose, which one has a higher boiling point and why?
  3. What happens when the external pressure applied becomes more than the osmotic pressure of solution?
→
Match the catalysts given in Column $I$ with the processes given in Column $II.$
 
Column $I ($Catalyst$)$
 
Column $II ($Process$)$
$(i)$
Ni in the presence of hydrogen
 $(a)$
Zieglar Natta catalyst
$(ii)$ $Cu_2Cl_2$ $(b)$
Contact process
$(iii)$ $V_2O_5$ $(c)$
Vegetable oil to ghee
$(iv)$
Finely divided iron
 $(d)$
Sandmeyer reaction
$(v)$ $TiCl_4 + Al (CH_3)_3$ $(e)$
Haber’s Process
 
 
 $(f)$
Decomposition of $KClO_3$
→
Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?
  1. w/w (mass percentage)
  2. V/V (volume percentage)
  3. w/V (mass by volume percentage)
  4. ppm. (parts per million)
  5. x (mole fraction)
  6. M (Molarity)
  7. m (Molality)
→