13. Selective precipitation is a process in which a. Compounds precipitate when

Question

13. Selective precipitation is a process in which a. Compounds precipitate when pH is altered b. Compounds precipitate if temperature is altered c. In presence of a suitable reagent, some cations precipitate d. None of the above 14. Common ions have the ability to a. Increase precipitation of insoluble salt b. Increase the reaction rate c. Shift the equilibrium to shift right d. Produce gases from the reactants 15. Molar solubility and Ksp are related that a. They are directly proportional to each other always b. They are indirectly proportional to each other always c. They are not related d. Their relationship depends on the dissociation stoichiometry of compounds. 16.A buffer is a solution a. That resists change in pH b. That resists change in concentration c. That resists change in the ionic concentration d. That resists change in reaction catalysis 17. Equivalence point is defined as a. pH at which quantities of acid and bases are equal b. pKa equals pH c. both a and b

Explanation / Answer

Ans 13 : c) In presence of a suitable reagent , some cations precipitate

The selective precipitation is used to detect the presence of dissolved ions in the solution , by adding a suitable reagent , due to which the ions seperate out of the solution.

For example : NaCl is added in the solution to precipitate out silver ions , in the form of AgCl.

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