Biomolecules — Chemistry STD 12 Science — Question

The following data were obtained during the first order thermal decomposition of N₂O₅(g) at a constant volume:
2N₂O₅(g) → 2N₂O₄(g) + O₂(g)

S. No.	Time/s	Total pressure/atm
1.	0	0.5
2.	100	0.512

Calculate the rate constant.

Rate constant k for first order reaction has been found to be 2.54 × 10^-3 s^-1. Calculate its three-fourth life.

A solution of [Ni(H₂O)₆]²⁺ is green but a solution of [Ni(CN)₄]^2- is colourless. Explain.

At 300 K, 36 g of glucose present in a litre of its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of the solution is 1.52 bars at the same temperature, what would be its concentration?

18g of glucose, C₆H₁₂O₆ (Molar Mass=180g mol^-1) is dissolved in 1kg of water in a sauce pan. At what temperature will this solution boil?
(K_b  for water = 0.52 K kg mol^-1, boiling point of pure water = 373.15 K).

After removing the outer shell of two eggs in dil. HCl, one is placed in distilled water and the other in a saturated solution of NaCl. What will you observe and why?

Give structures of the products you would expect when each of the following alcohol reacts with 

  HCl –ZnCl2

1. Butan-1-ol
2. 2-Methylbutan-2-ol

Draw the stereo structure of glucose, gluconic acid and saccharic acid given by Fischer.