Write the names of the monomers for the following polymer:

Nylon-2-nylon-6

Name the purine bases and pyrimidine bases present in RNA and DNA.

How will you obtain the following? (Give balanced equation.)

Picric acid from phenol

How will you obtain the following? (Give balanced equation.)

Ethyl chloride from diethyl ether.

40% of a first-order reaction is completed in 50 minutes. How much time will it take for the completion of 80% of this reaction?

The freezing point of a solution containing 5.85 g of NaCl in 100 g of water is –3.348°C. Calculate the van’t Hoff factor for this solution. What will be the experimental molecular weight of NaCl?
(K_f for water = 1.86 K kg mol–1, at wt, Na = 23, Cl = 35.5)

An aqueous solution containing 12.48 g of barium chloride (BaCl₂) in 1000g of water, boils at 100.0832°C. Calculate the degree of dissociation of barium chloride.
(Kb for water = 0.52 K kg mol^–1, at. wt. Ba = 137, Cl = 35.5)

28.

Examine the defective crystal given below and answer the question that follows :

State if the above defect is stoichiometric or non-stoichiometric. How does this defect affect the density of the crystal? Also, write the term used for this type of defect.

Give a reason for the following:

For ferric hydroxide sol, the coagulating power of phosphate ion is more than chloride ion.

Give a reason for the following:

Medicines are more effective in their colloidal form.