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 integrated rate Equation for 1st order reaction is
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?
(Kf 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)
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.