Amines — Chemistry STD 12 Science — Question

Explain the collision principle of any chemical reaction.

Attempt any five of the following:
(a) Aldopentoses named ribose and 2-deoxyribose are found in nucleic acids. What is their relative configuration?
(b) What are the three components of nucleic acids?
(c) Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called?
(d) Is nucleotide and nucleoside the same? What are their roles?
(e) Why cannot vitamin C be stored in our body?
(f) During curdling of milk, what happens to sugar present in it?
(g) Account for the following:
a. There are 5-OH groups in glucose.
b. Glucose is a reducing sugar

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

1. What type of deviation is shown by a mixture of ethanol and acetone? Give reason.
2. A solution of glucose (molar mass = 180 g mol^–1) in water is labelled as 10% (by mass). What would be the molality and molarity of the solution?

(Density of solution = 1.2 g mL^–1).

Explain the open chain structure of glucose.

1. What may be the possible oxidation states of the transition metals with the following d electronic configurations in the ground state of their atoms:

3d³4s², 3d⁵4s² and 3d⁶ 4s³. Indicate relative stability of oxidation states in each case.

2. Write steps involved in the preparation of (i) Na₂CrO₄ from chromite ore and (ii) K₂MnO₄ from pyrolusite ore.

What are the similarities between lanthanoids and actinoids?