PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Chemistry

A solution containing 15 g urea (molar mass = 60 g mol^–1) per litre of solution in water has the same osmotic pressure (isotonic) as a solution of glucose (molar mass = 180 g mol^–1) in water. Calculate the mass of glucose present in one litre of its solution.

With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids

Give the structures of A, B and C in the following reaction:

Explain the following term with a suitable example:

F-centres

If NaCl is doped with 10⁻³ mol % of SrCl₂, what is the concentration of cation vacancies?

Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C.

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?

Determine the amount of CaCl₂ (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 27°C.

Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K₂SO₄ in 2 liter of water at 25°C, assuming that it is completely dissociated.

What is the difference between multimolecular and macromolecular colloids? Give one example of each. How are associated colloids different from these two types of colloids?

What are micelles? Give an example of a micellers system.

Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.

Compare the chemistry of the actinoids with that of lanthanoids with reference to electronic configuration

Compare the chemistry of the actinoids with that of lanthanoids with reference to oxidation states

Compare the chemistry of the actinoids with that of lanthanoids with reference to chemical reactivity.

Discuss briefly, giving an example in the given case and the role of coordination compounds in medicinal chemistry.

CH₃CO₂H or CH₂FCO₂H

Which acid of the pair shown here would you expect to be stronger?

CH₂FCO₂H or CH₂ClCO₂H

Which acid of the pair shown here would you expect to be stronger?

CH₂FCH₂CH₂CO₂H or CH₃CHFCH₂CO₂H

Which acid of the pair shown here would you expect to be stronger?